首页 |元器件品牌

PTH04T240W [TI]

10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS⑩; 10 -A ， 2.2 V至5.5 V输入，非隔离，宽输出，具有TURBOTRANS⑩调节电源模块
PTH04T240W
型号： PTH04T240W
厂家： TEXAS INSTRUMENTS    TEXAS INSTRUMENTS
描述：

10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS⑩
10 -A ， 2.2 V至5.5 V输入，非隔离，宽输出，具有TURBOTRANS⑩调节电源模块

电源电路 输出元件 输入元件
文件： 总36页 (文件大小：950K)
中文：  中文翻译
下载：  下载PDF数据表文档文件
 查看货源
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED,  
WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™  
FEATURES  
•
•
•
•
•
•
Up to 10-A Output Current  
•
•
TurboTrans™ Technology  
2.2-V to 5.5-V Input Voltage  
Designed to meet Ultra-Fast Transient  
Requirements up to 300 A/µs  
Wide-Output Voltage Adjust (0.69 V to 3.6 V)  
±1.5% Total Output Voltage Variation  
Efficiencies up to 96%  
•
SmartSync Technology  
APPLICATIONS  
Output Overcurrent Protection  
(Nonlatching, Auto-Reset)  
•
•
•
Complex Multi-Voltage Systems  
Microprocessors  
Bus Drivers  
•
•
Operating Temperature: –40°C to 85°C  
Safety Agency Approvals: (Pending)  
– UL60950, CSA 22.2 950, EN60950 VDE  
Prebias Startup  
•
•
•
•
•
•
On/Off Inhibit  
Differential Output Voltage Remote Sense  
Adjustable Undervoltage Lockout  
Auto-Track™ Sequencing  
Ceramic Capacitor Version (PTH04T241W)  
DESCRIPTION  
The PTH04T240/241W is a high-performance 10-A rated, non-isolated power module. These modules represent  
the 2nd generation of the popular PTH series power modules and include a reduced footprint and additional  
features. The PTH04T241W is optimized to be used with all ceramic capacitors.  
Operating from an input voltage range of 2.2 V to 5.5 V, the PTH04T240/241W requires a single resistor to set  
the output voltage to any value over the range, 0.69 V to 3.6 V. The wide input voltage range makes the  
PTH04T240/241W particularly suitable for advanced computing and server applications that utilize a 2.5-V,  
3.3-V, or 5-V intermediate bus architecture.  
The module incorporates a comprehensive list of features. Output over-current and over-temperature shutdown  
protects against most load faults. A differential remote sense ensures tight load regulation. An adjustable  
under-voltage lockout allows the turn-on voltage threshold to be customized. Auto-Track™sequencing is a  
popular feature that greatly simplifies the simultaneous power-up and power-down of multiple modules in a  
power system.  
The PTH04T240/241W includes new patent pending technologies, TurboTrans™ and SmartSync. The  
TurboTrans feature optimizes the transient response of the regulator while simultaneously reducing the quantity  
of external output capacitors required to meet a target voltage deviation specification. Additionally, for a target  
output capacitor bank, TurboTrans can be used to significantly improve the regulators transient response by  
reducing the peak voltage deviation. SmartSync allows for switching frequency synchronization of multiple  
modules, thus simplifying EMI noise suppression tasks and reducing input capacitor RMS current requirements.  
The module uses double-sided surface mount construction to provide a low profile and compact footprint.  
Package options include both through-hole and surface mount configurations that are lead (Pb) - free and RoHS  
compatible.  
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas  
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
Auto-Track, TMS320 are trademarks of Texas Instruments.  
PRODUCTION DATA information is current as of publication date.  
Copyright © 2006, Texas Instruments Incorporated  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam  
during storage or handling to prevent electrostatic damage to the MOS gates.  
PTH04T240W  
SmartSync  
Track  
TurboTranst  
R
TT  
1%  
10  
1
9
0.05 W  
(Optional)  
V
Track SYNC  
TT  
I
6
5
7
+Sense  
2
+Sense  
V
I
V
O
V
O
PTH04T240W  
Inhibit  
11  
INH/UVLO  
GND  
−Sense  
L
O
A
D
GND  
4
V Adj  
O
+
+
C
O
3
8
R
[A]  
220 µF  
(Required)  
SET  
C 2  
22 µF  
(Optional)  
R
1%  
0.05 W  
C
I
220 µF  
(Required)  
1%  
0.05 W  
(Required)  
I
UVLO  
−Sense  
GND  
(Optional)  
GND  
UDG−06005  
A. RSET required to set the output voltage to a value higher than 0.69 V. See Electrical Characteristics table.  
PTH04T241W - Ceramic Capacitor Version  
SmartSync  
Track  
TurboTranst  
R
TT  
1%  
10  
1
9
0.05 W  
(Optional)  
Track SYNC  
TT  
VI  
6
5
7
+Sense  
2
+Sense  
V
I
V
O
V
O
PTH04T241W  
Inhibit  
11  
INH/UVLO  
GND  
−Sense  
L
O
A
D
GND  
4
V Adj  
O
C
O
3
8
R
[A]  
300 µF  
(Required)  
SET  
R
1%  
0.05 W  
(Optional)  
1%  
0.05 W  
(Required)  
C
I
UVLO  
200 µF  
(Required)  
−Sense  
GND  
GND  
UDG−06005  
A. RSET required to set the output voltage to a value higher than 0.69 V. See Electrical Characteristics table.  
2
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
ORDERING INFORMATION  
For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see  
the TI website at www.ti.com.  
DATASHEET TABLE OF CONTENTS  
DATASHEET SECTION  
ENVIRONMENTAL AND ABSOLUTE MAXIMUM RATINGS  
ELECTRICAL CHARACTERISTICS TABLE (PTH04T240W)  
ELECTRICAL CHARACTERISTICS TABLE (PTH04T241W)  
TERMINAL FUNCTIONS  
PAGE NUMBER  
3
4
6
8
TYPICAL CHARACTERISTICS (VI = 5V)  
TYPICAL CHARACTERISTICS (VI = 3.3V)  
ADJUSTING THE OUTPUT VOLTAGE  
INPUT & OUTPUT CAPACITOR RECOMMENDATIONS  
TURBOTRANS™ INFORMATION  
9
10  
11  
13  
17  
22  
23  
24  
25  
26  
26  
26  
27  
29  
31  
UNDERVOLTAGE LOCKOUT (UVLO)  
SOFT-START POWER-UP  
OUTPUT ON/OFF INHIBIT  
SYCHRONIZATION (SMARTSYNC)  
OVER-CURRENT PROTECTION  
OVER-TEMPERATURE PROTECTION  
REMOTE SENSE  
AUTO-TRACK SEQUENCING  
PREBIAS START-UP  
TAPE & REEL AND TRAY DRAWINGS  
ENVIRONMENTAL AND ABSOLUTE MAXIMUM RATINGS  
(Voltages are with respect to GND)  
UNIT  
VTrack Track pin voltage  
–0.3 to VI + 0.3  
–40 to 85  
235  
V
TA  
Operating temperature range Over VI range  
suffix AH  
suffix AD  
suffix AS  
suffix AZ  
Surface temperature of module body or  
pins for 5 seconds maximum.  
Twave Wave soldering temperature  
Treflow Solder reflow temperature  
260  
°C  
235(1)  
260(1)  
–40 to 125  
500  
Surface temperature of module body or  
pins  
Tstg  
Storage temperature  
Mechanical shock  
Per Mil-STD-883D, Method 2002.3 1 msec, 1/2 sine, mounted  
Mil-STD-883D, Method 2007.2 20-2000  
Hz  
suffix AH & AD  
suffix AS & AZ  
20  
G
Mechanical vibration  
15  
Weight  
3.8  
grams  
Flammability  
Meets UL94V-O  
(1) During reflow of surface mount package version do not elevate peak temperature of the module, pins or internal components above the  
stated maximum.  
3
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
ELECTRICAL CHARACTERISTICS  
PTH04T240W  
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 220 µF, CO = 220 µF, and IO = IO max (unless otherwise stated)  
PARAMETER  
TEST CONDITIONS  
PTH04T240W  
UNIT  
MIN  
TYP  
MAX  
10  
IO  
Output current  
Over VO range  
Over IO range  
Over IO range  
25°C, natural convection  
0
2.2  
A
V
0.69 ≤ VO≤ 1.7  
1.7 < VO≤ 3.6  
5.5  
5.5  
3.6  
VI  
Input voltage range  
VO+0.5(1)  
0.69  
VOADJ  
Output voltage adjust range  
Set-point voltage tolerance  
Temperature variation  
Line regulaltion  
V
(2)  
±0.5  
±0.3  
±3  
±1  
%Vo  
%Vo  
mV  
–40°C < TA < 85°C  
Over VI range  
VO  
Load regulation  
Over IO range  
±2  
mV  
(2)  
Total output variation  
Includes set-point, line, load, –40°C ≤ TA ≤ 85°C  
RSET = 1.21 kΩ, VO = 3.3 V  
±1.5  
%Vo  
94%  
92%  
90%  
88%  
87%  
85%  
80%  
20  
RSET = 2.38 kΩ, VO = 2.5 V  
RSET = 4.78 kΩ, VO = 1.8 V  
η
Efficiency  
IO = 10 A  
RSET = 7.09 kΩ, VO = 1.5 V  
RSET = 12.1 kΩ, VO = 1.2 V  
RSET = 20.8 kΩ, VO = 1.0 V  
RSET = 689 kΩ, VO = 0.7 V  
VO Ripple (peak-to-peak)  
Overcurrent threshold  
20-MHz bandwidth  
mVPP  
A
ILIM  
ttr  
Reset, followed by auto-recovery  
w/o TurboTrans  
20  
Recovery time  
VO over/undershoot  
Recovery time  
80  
µs  
CO = 220 µF, Type C  
mV  
∆Vtr  
ttrTT  
∆VtrTT  
IIL  
2.5 A/µs load step  
50 to 100% IOmax  
VO = 2.5 V  
135  
200  
27  
RTT = open  
Transient response  
w/ TurboTrans  
CO = 2000 µF, Type C,  
RTT = 0 Ω  
µs  
mV  
VO over/undershoot  
Track input current (pin 10)  
Pin to GND  
–130(3)  
1
µA  
dVtrack/dt Track slew rate capability  
CO ≤ CO (max)  
V/ms  
VI increasing, RUVLO = OPEN  
VI decreasing, RUVLO = OPEN  
Hysteresis, RUVLO = OPEN  
1.95  
1.5  
2.19  
Adjustable Under-voltage lockout  
UVLOADJ  
(pin 11)  
1.3  
V
0.5  
Input high voltage (VIH  
)
Open(4)  
0.8  
V
Inhibit control (pin 11)  
Input low voltage (VIL)  
-0.2  
Input low current (IIL), Pin 11 to GND  
235  
5
µA  
mA  
kHz  
Iin  
Input standby current  
Switching frequency  
Inhibit (pin 11) to GND, Track (pin 10) open  
f s  
Over VI and IO ranges, SmartSync (pin 1) to GND  
300  
Synchronization (SYNC)  
frequency  
fSYNC  
240  
2
400  
kHz  
VSYNCH  
VSYNCL  
tSYNC  
SYNC High-Level Input Voltage  
SYNC Low-Level Input Voltage  
SYNC Minimum Pulse Width  
5.5  
0.8  
V
V
200  
ns  
(5)  
Nonceramic  
Ceramic  
220  
CI  
External input capacitance  
µF  
(5)  
22  
(1) The minimum input voltage is 2.2 V or (VO + 0.5) V, whichever is greater.  
(2) The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a  
tolerance of 1% with 100 ppm/°C or better temperature stability.  
(3) A low-leakage (<100 nA), open-drain device, such as MOSFET or voltage supervisor IC, is recommended to control pin 10. The  
open-circuit voltage is less than VI.  
(4) This control pin has an internal pull-up. Do not place an external pull-up on this pin. If it is left open-circuit, the module operates when  
input power is applied. A small, low-leakage (<100 nA) MOSFET is recommended for control. The open-circuit voltage is less than  
3.5 Vdc. For additional information, see the related application information section.  
(5) A 220 µF input capacitor is required for proper operation. The input capacitor must be rated for a minimum of 500 mA rms of ripple  
current. An additional 22-µF ceramic input capacitor is recommended to reduce rms ripple current.  
4
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
ELECTRICAL CHARACTERISTICS (continued)  
PTH04T240W  
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 220 µF, CO = 220 µF, and IO = IO max (unless otherwise stated)  
PARAMETER  
TEST CONDITIONS  
PTH04T240W  
MIN TYP  
UNIT  
MAX  
(6)  
(7)  
Nonceramic  
Ceramic  
220  
3000  
Capacitance Value  
µF  
w/o TurboTrans  
w/ TurboTrans  
500  
Equivalent series resistance (non-ceramic)  
Capacitance Value  
7
mΩ  
µF  
CO  
External output capacitance  
see table  
10000  
(8)  
(8)  
Capacitance × ESR product (CO× ESR)  
1000  
4.5  
10000  
µF×mΩ  
106 Hr  
Per Telcordia SR-332, 50% stress,  
TA = 40°C, ground benign  
MTBF  
Reliability  
(6) A 220 µF external output capacitor is required for basic operation. The minimum output capacitance requirement increases when  
TurboTrans™ (TT) technology is utilized. See related Application Information for more guidance.  
(7) This is the calculated maximum disregarding TurboTrans™ technology. When the TurboTrans™ feature is utilized, the minimum output  
capacitance must be increased.  
(8) When using TurboTrans™ technology, a minimum value of output capacitance is required for proper operation. Additionally, low ESR  
capacitors are required for proper operation. See the application notes for further guidance.  
5
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
ELECTRICAL CHARACTERISTICS  
PTH04T241W (Ceramic Capacitors)  
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 200 µF ceramic, CO = 300 µF ceramic, and IO = IO max (unless otherwise stated)  
PARAMETER  
TEST CONDITIONS  
PTH04T241W  
UNIT  
MIN  
TYP  
MAX  
10  
IO  
Output current  
Over VO range  
Over IO range  
Over IO range  
25°C, natural convection  
0
A
V
0.69 ≤ VO≤ 1.7  
2.2  
5.5  
5.5  
3.6  
VI  
Input voltage range  
1.7 < VO≤ 3.6 VO+0.5(1)  
VOADJ  
Output voltage adjust range  
Set-point voltage tolerance  
Temperature variation  
Line regulaltion  
0.69  
V
(2)  
±0.5  
±0.3  
±3  
±1  
%Vo  
%Vo  
mV  
–40°C < TA < 85°C  
Over VI range  
VO  
Load regulation  
Over IO range  
±2  
mV  
(2)  
Total output variation  
Includes set-point, line, load, –40°C ≤ TA ≤ 85°C  
RSET = 1.21 kΩ, VO = 3.3 V  
±1.5  
%Vo  
94%  
92%  
90%  
88%  
87%  
85%  
80%  
20  
RSET = 2.38 kΩ, VO = 2.5 V  
RSET = 4.78 kΩ, VO = 1.8 V  
η
Efficiency  
IO = 10 A  
RSET = 7.09 kΩ, VO = 1.5 V  
RSET = 12.1 kΩ, VO = 1.2 V  
RSET = 20.8 kΩ, VO = 1.0 V  
RSET = 689 kΩ, VO = 0.7 V  
VO Ripple (peak-to-peak)  
Overcurrent threshold  
20-MHz bandwidth  
mVPP  
A
ILIM  
ttr  
Reset, followed by auto-recovery  
20  
w/o TurboTrans  
Recovery time  
60  
µs  
CO= 300 µF, Type A  
RTT = open  
mV  
∆Vtr  
ttrTT  
∆VtrTT  
IIL  
2.5 A/µs load step  
50 to 100% IOmax  
VO = 2.5 V  
VO over/undershoot  
110  
80  
Transient response  
w/ TurboTrans  
CO= 3000 µF, Type A  
RTT = short  
Recovery time  
µs  
mV  
VO over/undershoot  
33  
Track input current (pin 10)  
Pin to GND  
–130(3)  
1
µA  
dVtrack/dt Track slew rate capability  
CO ≤ CO (max)  
V/ms  
VI increasing, RUVLO = OPEN  
Vi decreasing, RUVLO = OPEN  
Hysteresis, RUVLO = OPEN  
1.95  
1.50  
0.5  
2.19  
Adjustable Under-voltage lockout  
UVLOADJ  
(pin 11)  
1.30  
-0.2  
V
Input high voltage (VIH  
)
Open(4)  
0.8  
V
Inhibit control (pin 11)  
Input low voltage (VIL)  
Input low current (IIL ), Pin 11 to GND  
235  
5
µA  
mA  
kHz  
Iin  
Input standby current  
Switching frequency  
Inhibit (pin 11) to GND, Track (pin 10) open  
Over VI and IO ranges, SmartSync (pin 1) to GND  
f s  
300  
Synchronization (SYNC)  
frequency  
fSYNC  
240  
2
400  
kHz  
VSYNCH  
VSYNCL  
tSYNC  
CI  
SYNC High-Level Input Voltage  
SYNC Low-Level Input Voltage  
SYNC Minimum Pulse Width  
External input capacitance  
5.5  
0.8  
V
V
200  
ns  
µF  
(5)  
Ceramic  
200  
(1) The minimum input voltage is 2.2 V or (VO + 0.5) V, whichever is greater.  
(2) The set-point voltage tolerance is affected by the tolerance and stability of RSET. The stated limit is unconditionally met if RSET has a  
tolerance of 1% with 100 ppm/°C or better temperature stability. .  
(3) A low-leakage (<100 nA), open-drain device, such as MOSFET or voltage supervisor IC, is recommended to control pin 10. The  
open-circuit voltage is less than VI.  
(4) This control pin has an internal pull-up. Do not place an external pull-up on this pin. If it is left open-circuit, the module operates when  
input power is applied. A small, low-leakage (<100 nA) MOSFET is recommended for control. The open-circuit voltage is less than  
3.5 Vdc. For additional information, see the related application note.  
(5) 200 µF of ceramic input capacitance is required for proper operation.  
6
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
ELECTRICAL CHARACTERISTICS (continued)  
PTH04T241W (Ceramic Capacitors)  
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 200 µF ceramic, CO = 300 µF ceramic, and IO = IO max (unless otherwise stated)  
PARAMETER  
TEST CONDITIONS  
PTH04T241W  
MIN TYP  
UNIT  
MAX  
(6)  
(7)  
w/o TurboTrans  
w/ TurboTrans  
Capacitance Value  
Ceramic  
300  
2000  
µF  
µF  
see table  
CO  
External output capacitance  
Reliability  
Capacitance Value  
5000  
(6)  
Capacitance × ESR product (CO× ESR)  
100  
4.5  
1000 µF×mΩ  
Per Telcordia SR-332, 50% stress,  
TA = 40°C, ground benign  
106 Hr  
MTBF  
(6) 300 µF of ceramic output capacitance is required for basic operation. The minimum output capacitance requirement increases when  
TurboTrans™ (TT) technology is utilized. Additionally, low ESR capacitors are required for proper operation. See related Application  
Information for more guidance.  
(7) This is the calculated maximum disregarding TurboTrans™ technology. When the TurboTrans™ feature is utilized, the minimum output  
capacitance must be increased.  
7
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
TERMINAL FUNCTIONS  
TERMINAL  
DESCRIPTION  
NAME  
VI  
NO.  
2
The positive input voltage power node to the module, which is referenced to common GND.  
The regulated positive power output with respect to GND.  
VO  
5
This is the common ground connection for the VI and VO power connections. It is also the 0 Vdc reference for  
the control inputs.  
GND  
3, 4  
The Inhibit pin is an open-collector/drain, negative logic input that is referenced to GND. Applying a low level  
ground signal to this input disables the module’s output and turns off the output voltage. When the Inhibit control  
is active, the input current drawn by the regulator is significantly reduced. If the Inhibit pin is left open-circuit, the  
module produces an output whenever a valid input source is applied.  
Inhibit(1) and  
UVLO  
11  
This pin is also used for input undervoltage lockout (UVLO) programming. Connecting a resistor from this pin to  
GND (pin 3) allows the ON threshold of the UVLO to be adjusted higher than the default value. For more  
information, see the Application Information section.  
A 0.05 W 1% resistor must be connected between this pin and pin 7 (–Sense), close to the module to set the  
output voltage to a value higher than 0.69 V. The temperature stability of the resistor should be 100 ppm/°C (or  
better). The setpoint range for the output voltage is from 0.69 V to 3.6 V. If left open circuit, the output voltage  
will default to its lowest value. For further information, on output voltage adjustment see the related application  
note.  
Vo Adjust  
8
The specification table gives the preferred resistor values for a number of standard output voltages.  
The sense input allows the regulation circuit to compensate for voltage drop between the module and the load.  
For optimal voltage accuracy, +Sense must be connected to VO, very close to the load.  
+ Sense  
– Sense  
6
7
The sense input allows the regulation circuit to compensate for voltage drop between the module and the load.  
For optimal voltage accuracy –Sense must be connected to GND (pin 4) very close to the module (within  
10 cm).  
This is an analog control input that enables the output voltage to follow an external voltage. This pin becomes  
active typically 20 ms after the input voltage has been applied, and allows direct control of the output voltage  
from 0 V up to the nominal set-point voltage. Within this range the module's output voltage follows the voltage at  
the Track pin on a volt-for-volt basis. When the control voltage is raised above this range, the module regulates  
at its set-point voltage. The feature allows the output voltage to rise simultaneously with other modules powered  
from the same input bus. If unused, this input should be connected to VI.  
Track  
10  
NOTE: Due to the undervoltage lockout feature, the output of the module cannot follow its own input voltage  
during power up. For more information, see the related application note.  
This input pin adjusts the transient response of the regulator. To activate the TurboTrans™ feature, a 1%,  
50 mW resistor must be connected between this pin and pin 6 (+Sense) very close to the module. For a given  
value of output capacitance, a reduction in peak output voltage deviation is achieved by utililizing this feature. If  
unused, this pin must be left open-circuit. The resistance requirement can be selected from the TurboTrans™  
resistor table in the Application Information section. External capacitance must never be connected to this pin  
unless the TurboTrans resistor value is a short, 0Ω.  
TurboTrans™  
9
1
This input pin sychronizes the switching frequency of the module to an external clock frequency. The SmartSync  
feature can be used to sychronize the switching fequency of multiple PTH04T240/241W modules, aiding EMI  
noise suppression efforts. If unused, this pin should be connected to GND (pin 3). For more information, please  
review the Application Information section.  
SmartSync  
(1) Denotes negative logic: Open = Normal operation, Ground = Function active  
11  
1
10  
9
2
8
7
PTH04T240/241W  
(Top View)  
6
5
3
4
8
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
(1)(2)  
TYPICAL CHARACTERISTICS  
CHARACTERISTIC DATA (VI = 5 V)  
EFFICIENCY  
vs  
LOAD CURRENT  
OUTPUT RIPPLE  
vs  
LOAD CURRENT  
POWER DISSIPATION  
vs  
LOAD CURRENT  
100  
32  
2.5  
2.5 V  
3.3 V  
3.3 V  
2.5 V  
3.3 V  
3.3 V  
90  
2.5 V  
1.2 V  
0.7 V  
2.5 V  
1.8 V  
1.2 V  
0.7 V  
3.3 V  
28  
24  
2.0  
1.5  
1.8 V  
80  
1.8 V  
1.5 V  
20  
1.2 V  
1.0 V  
1.2 V  
0.7 V  
2.5 V  
0.7 V  
1.0  
0.5  
70  
1.2 V  
16  
12  
3.3 V  
2.5 V  
1.8 V  
1.5 V  
1.2 V  
1.0 V  
0.7 V  
0.7 V  
60  
8
50  
8
0
2
4
6
8
10  
0
2
4
6
8
10  
0
2
4
6
8
10  
I − Output Current − A  
I
O
− Output Current − A  
O
I
O
− Output Current − A  
Figure 1.  
Figure 2.  
Figure 3.  
SAFE OPERATING AREA  
90  
Natural Convection  
For All V  
80  
70  
O
60  
50  
40  
30  
20  
0
2
4
6
8
10  
I
O
− Output Current − A  
Figure 4.  
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the  
converter. Applies to Figure 1, Figure 2, and Figure 3.  
(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum  
operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper.  
For surface mount packages (AS and AZ suffix), multiple vias must be utilized. Please refer to the mechanical specification for more  
information. Applies to Figure 4.  
9
Submit Documentation Feedback  
 
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
(1)(2)  
TYPICAL CHARACTERISTICS  
CHARACTERISTIC DATA (VI = 3.3 V)  
EFFICIENCY  
vs  
LOAD CURRENT  
OUTPUT RIPPLE  
vs  
LOAD CURRENT  
POWER DISSIPATION  
vs  
LOAD CURRENT  
100  
16  
14  
2.0  
1.6  
1.8 V  
2.5 V  
2.5 V  
1.2 V  
0.7 V  
2.5 V  
1.8 V  
1.2 V  
0.7 V  
0.7 V  
90  
80  
2.5 V  
12  
10  
1.2  
1.5 V  
1.0 V  
2.5 V  
1.2 V  
0.7 V  
1.2 V  
0.8  
0.4  
70  
60  
1.8 V  
1.2 V  
V
O
2.5 V  
1.8 V  
1.5 V  
1.2 V  
1.0 V  
0.7 V  
8
6
0.7 V  
50  
8
0
2
4
6
8
10  
0
2
4
6
8
10  
0
2
4
6
8
10  
I
O
− Output Current − A  
I
O
− Output Current − A  
I
O
− Output Current − A  
Figure 5.  
Figure 6.  
Figure 7.  
SAFE OPERATING AREA  
90  
80  
70  
Natural Convection  
For All V  
O
60  
50  
40  
30  
20  
0
2
4
6
8
10  
I
O
− Output Current − A  
Figure 8.  
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the  
converter. Applies to Figure 5, Figure 6, and Figure 7.  
(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum  
operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm double-sided PCB with 2 oz. copper.  
For surface mount packages (AS and AZ suffix), multiple vias must be utilized. Please refer to the mechanical specification for more  
information. Applies to Figure 8.  
10  
Submit Documentation Feedback  
 
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
APPLICATION INFORMATION  
ADJUSTING THE OUTPUT VOLTAGE  
The Vo Adjust control (pin 8) sets the output voltage of the PTH04T240/241W. The adjustment range is 0.69 V  
to 3.6 V. The adjustment method requires the addition of a single external resistor, RSET, that must be connected  
directly between the Vo Adjust and – Sense pins. Table 1 gives the standard value of the external resistor for a  
number of standard voltages, along with the actual output voltage that this resistance value provides.  
For other output voltages, the value of the required resistor can either be calculated using the following formula,  
or simply selected from the range of values given in Table 2. Figure 9 shows the placement of the required  
resistor.  
0.69  
* 0.69  
R
+ 10 kW   
* 1.43 kW  
SET  
V
O
(1)  
Table 1. Standard Values of RSET for Standard Output Voltages  
VO (Standard) (V)  
RSET (Standard Value) (kΩ)  
VO (Actual) (V)  
3.304  
(1)  
3.3  
1.21  
2.37  
4.75  
6.98  
12.1  
20.5  
681  
(1)  
2.5  
2.506  
(1)  
1.8  
1.807  
(1)  
1.5  
1.510  
1.2  
1
1.200  
1.004  
0.7  
0.700  
(1) The minimum input voltage is 2.2 V or (VO + 0.5) V, whichever is greater.  
6
+Sense  
+Sense  
PTH04T240W/241W  
5
7
V
O
V
O
−Sense  
VoAdj  
8
GND  
3,4  
R
SET  
1%  
0.05 W  
−Sense  
GND  
UDG−06043  
(1) RSET: Use a 0.05 W resistor with a tolerance of 1% and temperature stability of 100 ppm/°C (or better). Connect the  
resistor directly between VOAdjust (pin 8) and -Sense (pin 7), as close to the regulator as possible, using dedicated  
PCB traces.  
(2) Never connect capacitors from VO Adjust (pin 8) to either +Sense (pin 6), GND, or VO (pin 5). Any capacitance  
added to the VO Adjust pin affects the stability of the regulator.  
Figure 9. VO Adjust Resistor Placement  
11  
Submit Documentation Feedback  
 
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Table 2. Output Voltage Set-Point Resistor Values (Standard Values)(1)  
VO Required (V)  
0.70  
RSET (kΩ)  
681  
VO Required (V)  
1.80  
RSET (kΩ)  
4.75  
4.53  
4.22  
4.02  
3.83  
3.40  
3.09  
2.87  
2.61  
2.37  
2.15  
2.00  
1.82  
1.69  
1.54  
1.43  
1.33  
1.21  
1.10  
1.02  
0.931  
0.75  
113  
1.85  
0.80  
61.9  
41.2  
31.6  
24.9  
20.5  
17.8  
15.4  
13.7  
12.1  
10.7  
9.88  
9.09  
8.25  
7.68  
6.98  
6.49  
6.04  
5.76  
5.36  
5.11  
1.90  
0.85  
1.95  
0.90  
2.00  
0.95  
2.10  
1.00  
2.20  
1.05  
2.30  
1.10  
2.40  
1.15  
2.50  
1.20  
2.60  
1.25  
2.70  
1.30  
2.80  
1.35  
2.90  
1.40  
3.00  
1.45  
3.10  
1.50  
3.20  
1.55  
3.30  
1.60  
3.40  
1.65  
3.50  
1.70  
3.60  
1.75  
(1) The minimum input voltage is 2.2 V or (VO + 0.5) V, whichever is greater.  
12  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
CAPACITOR RECOMMENDATIONS FOR THE PTH04T240/241W POWER MODULE  
Capacitor Technologies  
Electrolytic Capacitors  
When using electrolytic capacitors, high quality, computer-grade electrolytic capacitors are recommended.  
Aluminum electrolytic capacitors provide adequate decoupling over the frequency range, 2 kHz to 150 kHz,  
and are suitable when ambient temperatures are above -20°C. For operation below -20°C, tantalum,  
ceramic, or OS-CON type capacitors are required.  
Ceramic Capacitors  
Above 150 kHz the performance of aluminum electrolytic capacitors is less effective. Multilayer ceramic  
capacitors have very low ESR and a resonant frequency higher than the bandwidth of the regulator. They  
can be used to reduce the reflected ripple current at the input as well as improve the transient response of  
the output.  
Tantalum, Polymer-Tantalum Capacitors  
Tantalum type capacitors may only used on the output bus, and are recommended for applications where  
the ambient operating temperature is less than 0°C. The AVX TPS series and Kemet capacitor series are  
suggested over many other tantalum types due to their lower ESR, higher rated surge, power dissipation,  
and ripple current capability. Tantalum capacitors that have no stated ESR or surge current rating are not  
recommended for power applications.  
Input Capacitor (Required)  
The PTH04T241W requires a minimum input capacitance of 200 µF of ceramic type.  
The PTH04T240W requires a minimum input capacitance of 220 µF. The ripple current rating of the input  
capacitor must be at least 500 mArms. An optional 22 µF X5R/X7R ceramic is recommended to reduce the RMS  
ripple current.  
Input Capacitor Information  
The size and value of the input capacitor is determined by the converter’s transient performance capability. This  
minimum value assumes that the converter is supplied with a responsive, low inductance input source. This  
source should have ample capacitive decoupling, and be distributed to the converter via PCB power and ground  
planes.  
Ceramic capacitors should be located as close as possible to the module's input pins, within 0.5 inch (1,3 cm).  
Adding ceramic capacitance is necessary to reduce the high-frequency ripple voltage at the module's input. This  
will reduce the magnitude of the ripple current through the electroytic capacitor, as well as the amount of ripple  
current reflected back to the input source. Additional ceramic capacitors can be added to further reduce the  
RMS ripple current requirement for the electrolytic capacitor.  
Increasing the minimum input capacitance to 680 µF is recommended for high-performance applications, or  
wherever the input source performance is degraded.  
The main considerations when selecting input capacitors are the RMS ripple current rating, temperature stability,  
and less than 100 mΩ of equivalent series resistance (ESR).  
Regular tantalum capacitors are not recommended for the input bus. These capacitors require a recommended  
minimum voltage rating of 2 × (maximum dc voltage + ac ripple). This is standard practice to ensure reliability.  
No tantalum capacitors were found with a sufficient voltage rating to meet this requirement.  
When the operating temperature is below 0°C, the ESR of aluminum electrolytic capacitors increases. For these  
applications, OS-CON, poly-aluminum, and polymer-tantalum types should be considered.  
13  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Output Capacitor (Required)  
The PTH04T241W requires a minimum output capacitance of 300 µF of ceramic type.  
The PTH04T240W requires a minimum output capacitance of 220 µF of aluminum, polymer-aluminum, tantulum,  
or polymer-tantalum type.  
The required capacitance above the minimum will be determined by actual transient deviation requirements. See  
the TurboTrans Technology application section within this document for specific capacitance selection.  
Output Capacitor Information  
When selecting output capacitors, the main considerations are capacitor type, temperature stability, and ESR.  
When using the TurboTrans feature, the capacitance x ESR product should also be considered (see the  
following section).  
Ceramic output capacitors added for high-frequency bypassing should be located as close as possible to the  
load to be effective. Ceramic capacitor values below 10 µF should not be included when calculating the total  
output capacitance value.  
When the operating temperature is below 0°C, the ESR of aluminum electrolytic capacitors increases. For these  
applications, OS-CON, poly-aluminum, and polymer-tantalum types should be considered.  
TurboTrans Output Capacitance  
TurboTrans allows the designer to optimize the output capacitance according to the system transient design  
requirement. High quality, ultra-low ESR capacitors are required to maximize TurboTrans effectiveness. When  
using TurboTrans, the capacitor's capacitance (µF) × ESR (mΩ) product determines its capacitor type; Type A,  
B, or C. These three types are defined as follows:  
Type A = (100 ≤ capacitance × ESR ≤ 1000) (e.g. ceramic)  
Type B = (1000 < capacitance × ESR ≤ 5000) (e.g. polymer-tantalum)  
Type C = (5000 < capacitance × ESR ≤ 10,000) (e.g. OS-CON)  
When using more than one type of output capacitor, select the capacitor type that makes up the majority of your  
total output capacitance. When calculating the C×ESR product, use the maximum ESR value from the capacitor  
manufacturer's datasheet.  
The PTH04T241W should be used when only Type A (ceramic) capacitors are used on the output.  
Working Examples:  
A capacitor with a capacitance of 330 µF and an ESR of 5 mΩ, has a C × ESR product of 1650 µF x mΩ  
(330 µF × 5 mΩ). This is a Type B capacitor. A capacitor with a capacitance of 1000 µF and an ESR of 8 mΩ,  
has a C × ESR product of 8000 µF x mΩ (1000 µF × 8 mΩ). This is a Type C capacitor.  
See the TurboTrans Technology application section within this document for specific capacitance selection.  
Table 3 includes a preferred list of capacitors by type and vendor. See the Output Bus / TurboTrans column.  
Non-TurboTrans Output Capacitance  
If the TurboTrans feature is not used, minimum ESR and maximum capacitor limits must be followed. System  
stability may be effected and increased output capacitance may be required without TurboTrans.  
When using the PTH04T240W, observe the minimum ESR of the entire output capacitor bank. The minimum  
ESR limit of the output capacitor bank is 7 mΩ. A list of preferred low-ESR type capacitors, are identified in  
Table 3.  
When using the PTH04T241W without the TurboTrans feature, the maximum amount of capacitance is 3000 µF  
of ceramic type. Large amounts of capacitance may reduce system stability.  
Utilizing the TurboTrans feature improves system stability, improves transient response, and reduces  
the amount of output capacitance required to meet system transient design requirements.  
14  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Designing for Fast Load Transients  
The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of  
2.5 A/µs. The typical voltage deviation for this load transient is given in the Electrical Characteristics table using  
the minimum required value of output capacitance. As the di/dt of a transient is increased, the response of a  
converter’s regulation circuit ultimately depends on its output capacitor decoupling network. This is an inherent  
limitation with any dc/dc converter once the speed of the transient exceeds its bandwidth capability.  
If the target application specifies a higher di/dt or lower voltage deviation, the requirement can only be met with  
additional low ESR ceramic capacitor decoupling. Generally, with load steps greater than 100 A/µs, adding  
multiple 10 µF ceramic capacitors plus 10 × 1 µF, and numerous high frequency ceramics (≤ 0.1 µF) is all that is  
required to soften the transient higher frequency edges. The PCB location of these capacitors in relation to the  
load is critical. DSP, FPGA and ASIC vendors identify types, location and amount of capacitance required for  
optimum performance. Low impedance buses, unbroken PCB copper planes, and components located as close  
as possible to the high frequency devices are essential for optimizing transient performance.  
Table 3. Input/Output Capacitors(1)  
Capacitor Characteristics  
Quantity  
(2)  
Max  
Max  
Output Bus  
Ripple  
Capacitor Vendor,  
Type Series (Style)  
Working  
Voltage  
(V)  
ESR  
Turbo-  
Trans  
Capacitor  
Type(3)  
Value  
(µF)  
Current  
at 85°C  
(Irms)  
(mA)  
Physical  
Size (mm)  
Input  
Bus  
No  
Turbo-  
Trans  
at 100  
kHz  
Vendor Part No.  
(mΩ)  
Panasonic  
SP series (UE)  
6.3  
6.3  
6.3  
220  
390  
470  
15  
3000  
555  
7,3×4,3  
8 X 11,5  
10 X 10,2  
2
1
1
1≤ 2  
≥ 1  
B ≥ 1(3)  
N/R(4)  
N/R(4)  
EEFUE0J221R  
FC (Radial)  
117  
160  
EEUFC0J391  
EEVFK0J471P  
FK (SMD)  
600  
≥ 1  
United Chemi-Con  
PTB, Poly-Tantalum(SMD)  
LXZ, Aluminum (Radial)  
PS, Poly-Alum (Radial)  
PT Poly-Tantalum (SMD)  
MVY, Aluminum (SMD)  
PXA, Poly-Alum (Radial)  
Nichicon, Aluminum  
WG (SMD)  
6.3  
6.3  
6.3  
6.3  
10  
330  
680  
390  
330  
680  
330  
25  
120  
12  
2600  
555  
7,3×4,3×2,8  
8 X 12  
1
1
1
1
1
1
1 ≤ 3  
1
C ≥ 2(3)  
N/R(4)  
6PTB337MD6TER  
LXZ6.3VB681M8X12LL  
6PS390MH11  
4770  
3000  
670  
8 X 11,5  
7,3×4,3  
≤ 1  
1
B ≥ 2(3)  
N/R(4)  
40  
6PT337MD8TER  
150  
14  
10 × 10  
1
B ≥ 2(3)  
B ≥ 1(3)  
MVY10VC681MJ10TP  
PXA10VC331MH12  
10 V  
4420  
8 × 12,2  
1 ≤ 2  
10  
10  
470  
470  
150  
72  
670  
760  
10 × 10  
1
1
1
1
N/R(4)  
N/R(4)  
UWG1A471MNR1GS  
UHD1A471MPR  
HD (Radial)  
8 X 11,5  
Panasonic, Poly-Aluminum  
SE Series (SMD)  
2.0  
560  
5
4000  
7,3×4,3×4,2 N/R(5)  
N/R(6)  
B ≥ 2(3)  
EEFSE0J561R(VO≤ 1.6V)(7)  
(1) Capacitor Supplier Verification  
Please verify availability of capacitors identified in this table. Capacitor suppliers may recommend alternative part numbers because of  
limited availability or obsolete products.  
RoHS, Lead-free and Material Details  
See the capacitor suppliers regarding material composition, RoHS status, lead-free status, and manufacturing process requirements.  
Component designators or part number deviations can occur when material composition or soldering requirements are updated.  
(2) Additional output capacitance must include the required 100 µF of ceramic type.  
(3) Required capacitors with TurboTrans. See the TurboTrans Application information for Capacitor Selection  
Capacitor Types:  
•
•
•
Type A = (100 < capacitance × ESR ≤ 1000)  
Type B = (1,000 < capacitance × ESR ≤ 5,000)  
Type C = (5,000 < capacitance × ESR ≤ 10,000)  
(4) Aluminum Electrolytic capacitor not recommended for the TurboTrans due to higher ESR × capacitance products. Aluminum and higher  
ESR capacitors can be used in conjunction with lower ESR capacitance.  
(5) N/R – Not recommended. The voltage rating does not meet the minimum operating limits.  
(6) N/R – Not recommended. The ESR value of this capacitor is below the required minimum when not using TurboTrans.  
(7) The voltage rating of this capacitor only allows it to be used for output voltage that is equal to or less than 80% of the working voltage.  
15  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Table 3. Input/Output Capacitors (continued)  
Capacitor Characteristics  
Quantity  
(2)  
Max  
Ripple  
Current  
at 85°C  
(Irms)  
(mA)  
Output Bus  
Max  
ESR  
at 100  
kHz  
Capacitor Vendor,  
Type Series (Style)  
Working  
Voltage  
(V)  
Turbo-  
Trans  
Capacitor  
Type(3)  
Value  
(µF)  
Physical  
Size (mm)  
Input  
Bus  
No  
Turbo-  
Trans  
Vendor Part No.  
(mΩ)  
Sanyo  
TPE, POSCAP (SMD)  
TPE, POSCAP (SMD)  
TPD, POSCAP (SMD)  
SEP, OS-CON (Radial)  
SVPA, OS-CON (Radial)  
SVP, OS-CON (SMD)  
AVX, Tantalum  
10  
2.5  
2.5  
6.3  
6.3  
10  
330  
470  
1000  
470  
470  
330  
25  
7
3300  
4400  
6100  
4210  
4130  
3700  
7,3×4,3  
7,3×4,3  
7,3×4,3  
10 × 12  
10 × 7,9  
10 × 7,9  
1
1 ≤ 3  
≤1  
C ≥ 1(8)  
B ≥ 2(8)  
B ≥ 1(8)  
C ≥ 1(8)  
C ≥ 2(8)  
C ≥ 1(8)  
10TPE330MF  
N/R(9)  
2R5TPE470M7(VO≤ 1.8V)(10)  
2R5TPD1000M5(VO≤ 1.8V)(10)  
6SEP470M  
5
N/R(9)  
N/R(11)  
1 ≤ 2  
1 ≤ 2  
1 ≤ 3  
15  
19  
25  
1
1
1
6SVPA470M  
10SVP330MX  
TPM Multianode  
10  
10  
4
330  
330  
23  
40  
25  
3000  
1830  
2400  
7,3×4,3×4,1  
7,3×4,3×4,1  
1
1
1 ≤ 3  
1 ≤ 6  
1 ≤ 5  
C ≥ 2(8)  
N/R(12)  
N/R(12)  
TPME337M010R0035  
TPS Series III (SMD)  
TPS Series III (SMD)  
Kemet, Poly-Tantalum  
T520 (SMD)  
TPSE337M010R0040  
1000  
7,3×6,1×3.5 N/R(9)  
TPSV108K004R0035 (VO≤ 2.1V)(13)  
10  
6.3  
4
330  
330  
25  
15  
5
2600  
3800  
7300  
7300  
7,3×4,3×4,1  
7,3×4,3×4,1  
1
1
1 ≤ 3  
1 ≤ 2  
C ≥ 2(8)  
B ≥ 2(8)  
B ≥ 1(8)  
B ≥ 1(8)  
T520X337M010ASE025  
T530 (SMD)  
T530X337M010ASE015(10)  
T530 (SMD)  
680  
7,3×4,3×4,1 N/R(9)  
7,3×4,3×4,1 N/R(9)  
N/R(11)  
N/R(11)  
T530X687M004ASE005 (VO≤ 3.2V)(10)  
T530X108M2R5ASE005 (VO≤ 2.0V)(10)  
T530 (SMD)  
2.5  
1000  
5
Vishay-Sprague  
597D, Tantalum (SMD)  
94SP, OS-CON (Radial)  
94SVP OS-CON(SMD)  
Kemet, Ceramic X5R  
(SMD)  
10  
6.3  
6.3  
6.3  
6.3  
6.3  
6.3  
16  
330  
390  
470  
100  
47  
35  
16  
17  
2
2500  
3810  
3960  
–
7,3×5,7×4,1  
8 X 10,5  
8 × 12  
1
1
1
1
1
1
1
1
1
1
1
1
1
1 ≤ 5  
1 ≤ 2  
N/R(12)  
C ≥ 2(8)  
C ≥ 1(8)  
A(8)  
597D337X010E2T  
94SP397X06R3EBP  
94SVP477X06F12  
1 ≤ 2  
3225  
1(14)  
C1210C107M9PAC  
C1210C476K9PAC  
GRM32ER60J107M  
GRM32ER60J476ME20L  
GRM32ER61CE226KE20L  
GRM32DR61C106K  
C3225X5R0J107MT  
C3225X5R0J476MT  
C3225X5R1C106MT0  
C3225X5R1C226MT  
2
≥ 2(14)  
≥ 1(14)  
≥ 2(14)  
≥ 5(14)  
≥ 1(14)  
≥ 1(14)  
≥ 1(14)  
≥ 1(14)  
≥ 1(14)  
A(8)  
Murata, Ceramic X5R  
(SMD)  
100  
47  
2
–
3225  
3225  
A(8)  
A(8)  
22  
A(8)  
16  
10  
A(8)  
TDK, Ceramic X5R  
(SMD)  
6.3  
6.3  
16  
100  
47  
2
–
A(8)  
A(8)  
10  
A(8)  
16  
22  
A(8)  
(8) Required capacitors with TurboTrans. See the TurboTrans Application information for Capacitor Selection  
Capacitor Types:  
•
•
•
Type A = (100 < capacitance × ESR ≤ 1000)  
Type B = (1,000 < capacitance × ESR ≤ 5,000)  
Type C = (5,000 < capacitance × ESR ≤ 10,000)  
(9) N/R – Not recommended. The voltage rating does not meet the minimum operating limits.  
(10) The voltage rating of this capacitor only allows it to be used for output voltage that is equal to or less than 80% of the working voltage.  
(11) N/R – Not recommended. The ESR value of this capacitor is below the required minimum when not using TurboTrans.  
(12) Aluminum Electrolytic capacitor not recommended for the TurboTrans due to higher ESR × capacitance products. Aluminum and higher  
ESR capacitors can be used in conjunction with lower ESR capacitance.  
(13) The voltage rating of this capacitor only allows it to be used for output voltage that is equal to or less than 50% of the working voltage.  
(14) Any combination of ceramic capacitor values is limited as listed in the Electrical Characteristics table.  
16  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
TurboTrans™ Technology  
TurboTrans technology is a feature introduced in the T2 generation of the PTH/PTV family of power modules.  
TurboTrans optimizes the transient response of the regulator with added external capacitance using a single  
external resistor. Benefits of this technology include reduced output capacitance, minimized output voltage  
deviation following a load transient, and enhanced stability when using ultra-low ESR output capacitors. The  
amount of output capacitance required to meet a target output voltage deviation will be reduced with TurboTrans  
activated. Likewise, for a given amount of output capacitance, with TurboTrans engaged, the amplitude of the  
voltage deviation following a load transient will be reduced. Applications requiring tight transient voltage  
tolerances and minimized capacitor footprint area will benefit greatly from this technology.  
TurboTrans™ Selection  
Utilizing TurboTrans requires connecting a resistor, RTT, between the +Sense pin (pin 6) and the TurboTrans pin  
(pin 9). The value of the resistor directly corresponds to the amount of output capacitance required. All T2  
products require a minimum value of output capacitance whether or not TurboTrans is utilized. For the  
PTH04T240W, the minimum required capacitance is 220 µF. The minimum required capacitance for the  
PTH04T241W is 300 µF of ceramic type. When using TurboTrans, capacitors with a capacitance × ESR product  
below 10,000 µF×mΩ are required. (Multiply the capacitance (in µF) by the ESR (in mΩ) to determine the  
capacitance × ESR product.) See the Capacitor Selection section of the datasheet for a variety of capacitors that  
meet this criteria.  
Figure 10 thru Figure 15 show the amount of output capacitance required to meet a desired transient voltage  
deviation with and without TurboTrans for several capacitor types; Type A (e.g. ceramic), Type B (e.g.  
polymer-tantalum), and Type C (e.g. OS-CON). To calculate the proper value of RTT, first determine your  
required transient voltage deviation limits and magnitude of your transient load step. Next, determine what type  
of output capacitors will be used. (If more than one type of output capacitor is used, select the capacitor type  
that makes up the majority of your total output capacitance.) Knowing this information, use the chart in Figure 10  
thru Figure 15 that corresponds to the capacitor type selected. To use the chart, begin by dividing the maximum  
voltage deviation limit (in mV) by the magnitude of your load step (in Amps). This gives a mV/A value. Find this  
value on the Y-axis of the appropriate chart. Read across the graph to the 'With TurboTrans' plot. From this  
point, read down to the X-axis which lists the minimum required capacitance, CO, to meet that transient voltage  
deviation. The required RTT resistor value can then be calculated using the equation or selected from the  
TurboTrans table. The TurboTrans tables include both the required output capacitance and the corresponding  
RTT values to meet several values of transient voltage deviation for 25% (2.5 A), 50% (5 A), and 75% (7.5 A)  
output load steps.  
The chart can also be used to determine the achievable transient voltage deviation for a given amount of output  
capacitance. By selecting the amount of output capacitance along the X-axis, reading up to the desired 'With  
TurboTrans'' curve, and then over to the Y-axis, gives the transient voltage deviation limit for that value of output  
capacitance. The required RTT resistor value can be calculated using the equation or selected from the  
TurboTrans table.  
As an example, let's look at a 5-V application requiring a 50 mV deviation during an 5 A, 50% load transient. A  
majority of 330 µF, 10 mΩ ouput capacitors will be used. Use the 5-V, Type B capacitor chart, Figure 12.  
Dividing 50 mV by 5 A gives 10 mV/A transient voltage deviation per amp of transient load step. Select 10 mV/A  
on the Y-axis and read across to the 'With TurboTrans'' plot. Following this point down to the X-axis gives a  
minimum required output capacitance of approximately 760 µF. The required RTT resistor value for 760 µF can  
then be calculated or selected from Table 5. The required RTT resistor is approximately 4.99 kΩ.  
To see the benefit of TurboTrans, follow the 10 mV/A marking across to the 'Without TurboTrans' plot. Following  
that point down shows that you would need a minimum of 2700 µF of output capacitance to meet the same  
transient deviation limit. This is the benefit of TurboTrans.  
17  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
PTH04T241W - Type A Ceramic Capacitors  
5-V Input  
3.3-V Input  
40  
40  
30  
30  
20  
20  
10  
9
8
10  
9
8
7
7
6
5
6
PTH04T241W  
Type A Ceramic Capacitors  
PTH04T241W  
Type A Ceramic Capacitors  
5
4
4
C − Capacitance − µF  
C − Capacitance − µF  
Figure 10. Cap Type A, 100 ≤ C(µF)×ESR(mΩ) ≤ 1000  
Figure 11. Cap Type A, 100 ≤ C(µF)xESR(mΩ) ≤ 1000  
(e.g. Ceramic)  
(e.g. Ceramic)  
Table 4. Type A TurboTrans CO Values and Required RTT Selection Table  
Transient Voltage Deviation (mV)  
5-V Input  
3.3-V Input  
25% load step  
(2.5 A)  
50% load step  
(5 A)  
75% load step  
(7.5 A)  
CO  
Minimum  
RTT  
Required  
CO  
Minimum  
RTT  
Required  
Required Output  
Capacitance (µF)  
TurboTrans  
Resistor (kΩ)  
Required Output  
Capacitance (µF)  
TurboTrans  
Resistor (kΩ)  
60  
50  
40  
30  
25  
20  
18  
120  
100  
80  
180  
150  
120  
90  
300  
340  
open  
232  
300  
390  
open  
97.6  
30.1  
9.76  
4.02  
short  
short  
500  
40.2  
12.4  
5.11  
0.274  
short  
550  
60  
770  
840  
50  
75  
1030  
1460  
2420  
1100  
1700  
2830  
40  
60  
36  
54  
RTT Resistor Selection  
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming, see Equation 2  
ƪ
1 * ǒC ń1500Ǔƫ  
O
( )  
kW  
R
+ 40   
TT  
ƪǒ  
Ǔ
ƫ
5   C ń1500 * 1  
O
(2)  
Where CO is the total output capacitance in µF. CO values greater than or equal to 1500 µF require RTT to be a  
short, 0Ω. (RTT results in a negative value when CO > 1500 µF).  
To ensure stability, a minimum amount of output capacitance is required for a given RTT resistor value. The  
value of RTT must be calculated using the minimum required output capacitance determined from the capacitor  
transient response charts above.  
18  
Submit Documentation Feedback  
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
PTH04T240W Type B Capacitors  
5-V Input  
3.3-V Input  
30  
30  
20  
WIth TurboTrans  
Without TurboTrans  
WIth TurboTrans  
Without TurboTrans  
20  
10  
9
10  
9
8
8
7
6
7
6
5
4
5
4
3
3
C − Capacitance − µF  
C − Capacitance − µF  
Figure 12. Cap Type B, 1000 < C(µF)×ESR(mΩ) ≤ 5000  
Figure 13. Cap Type B, 1000 < C(µF)×ESR(mΩ) ≤ 5000  
(e.g. Polymer-Tantalum)  
(e.g. Polymer-Tantalum)  
Table 5. Type B TurboTrans CO Values and Required RTT Selection Table  
Transient Voltage Deviation (mV)  
5-V Input  
3.3-V Input  
25% load step  
(2.5 A)  
50% load step  
(5 A)  
75% load step  
(7.5 A)  
CO  
Minimum  
RTT  
Required  
CO  
Minimum  
RTT  
Required  
Required Output  
Capacitance (µF)  
TurboTrans  
Resistor (kΩ)  
Required Output  
Capacitance (µF)  
TurboTrans  
Resistor (kΩ)  
70  
60  
50  
40  
30  
25  
20  
15  
10  
140  
120  
100  
80  
210  
180  
150  
120  
90  
220  
240  
open  
464  
220  
270  
open  
158  
300  
80.6  
30.1  
10.7  
4.99  
0.75  
short  
short  
330  
56.2  
24.3  
9.53  
4.64  
0.75  
short  
short  
410  
450  
60  
600  
620  
50  
75  
760  
780  
40  
60  
1050  
2400  
10000  
1050  
2250  
7900  
30  
45  
20  
30  
RTT Resistor Selection  
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming, see Equation 3.  
40   ƪ1 * ǒC ń1100Ǔƫ  
O
( )  
kW  
R
+
TT  
ƪǒ  
Ǔ
ƫ
C ń220 * 1  
O
(3)  
Where CO is the total output capacitance in µF. CO values greater than or equal to 1100 µF require RTT to be a  
short, 0Ω. (RTT results in a negative value when CO > 1100 µF).  
To ensure stability, a minimum amount of output capacitance is required for a given RTT resistor value. The  
value of RTT must be calculated using the minimum required output capacitance determined from the capacitor  
transient response charts above.  
19  
Submit Documentation Feedback  
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
PTH04T240W Type C Capacitors  
5-V Input  
3.3-V Input  
30  
30  
20  
WIth TurboTrans  
Without TurboTrans  
WIth TurboTrans  
Without TurboTrans  
20  
10  
9
10  
9
8
8
7
7
6
6
5
4
5
4
3
3
C − Capacitance − µF  
C − Capacitance − µF  
Figure 14. Cap Type C, 5000 < C(µF)×ESR(mΩ) ≤ 10,000  
Figure 15. Cap Type C, 5000 < C(µF)×ESR(mΩ) ≤ 10,000  
(e.g. OS-CON)  
(e.g. OS-CON)  
Table 6. Type C TurboTrans CO Values and Required RTT Selection Table  
Transient Voltage Deviation (mV)  
5-V Input  
3.3-V Input  
25% load step  
(2.5 A)  
50% load step  
(5 A)  
75% load step  
(7.5 A)  
CO  
Minimum  
RTT  
Required  
CO  
Minimum  
RTT  
Required  
Required Output  
Capacitance (µF)  
TurboTrans  
Resistor (kΩ)  
Required Output  
Capacitance (µF)  
TurboTrans  
Resistor (kΩ)  
75  
60  
50  
40  
30  
25  
20  
15  
10  
150  
120  
100  
80  
225  
180  
150  
120  
90  
220  
270  
open  
137  
220  
open  
95.3  
42.2  
19.1  
7.32  
3.09  
short  
short  
N/A  
290  
350  
49.9  
21.5  
7.32  
3.09  
short  
short  
short  
360  
460  
480  
680  
60  
680  
50  
75  
860  
860  
40  
60  
1150  
2750  
9300  
1200  
30  
45  
3000  
20  
30  
above maximum  
RTT Resistor Selection  
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming, see Equation 4.  
40   ƪ1 * ǒC ń1100Ǔƫ  
O
( )  
kW  
R
+
TT  
ǒǒ Ǔ  
C
Ǔ
ƪ
ƫ
ń220 * 1  
O
(4)  
Where CO is the total output capacitance in µF. CO values greater than or equal to 1100 µF require RTT to be a  
short, 0Ω. (RTT results in a negative value when CO > 1100 µF).  
To ensure stability, the value of RTT must be calculated using the minimum required output capacitance  
determined from the capacitor transient response charts above.  
20  
Submit Documentation Feedback  
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
TurboTrans  
R
TT  
0 kW  
10  
9
AutoTrack  
TurboTrans  
+Sense  
6
1
2
+Sense  
Smart  
Sync  
V
I
V
O
5
7
PTH04T240W  
V
I
V
O
11  
Inhibit/  
Prog UVLO  
−Sense  
V Adj  
O
GND  
3
4
8
L
O
A
D
C
O
1220 mF  
Type B  
C
I
220 mF  
(Required)  
R
SET  
1%  
0.05 W  
−Sense  
GND  
GND  
Figure 16. Typical TurboTrans™ Application  
PTH04T240W  
C
O
= 1220 µF  
Without TurboTrans  
(50 mV/div)  
With TurboTrans  
(50 mV/div)  
2.5 A/µs  
50% Load Step  
T − Time − 200 µs/div  
Figure 17. Typical TurboTrans Waveforms  
21  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
UNDERVOLTAGE LOCKOUT (UVLO)  
The PTH04T240/241W power modules incorporate an input undervoltage lockout (UVLO). The UVLO feature  
prevents the operation of the module until there is sufficient input voltage to produce a valid output voltage. This  
enables the module to provide a clean, monotonic powerup for the load circuit, and also limits the magnitude of  
current drawn from the regulator’s input source during the power-up sequence.  
The UVLO characteristic is defined by the ON threshold (VTHD) voltage. Below the ON threshold, the Inhibit  
control is overridden, and the module does not produce an output. The hysteresis voltage, which is the  
difference between the ON and OFF threshold voltages, is set at 500 mV. The hysteresis prevents start-up  
oscillations, which can occur if the input voltage droops slightly when the module begins drawing current from  
the input source.  
The UVLO feature of the PTH04T240/241W module allows for limited adjustment of the ON threshold voltage.  
The adjustment is made via the Inhbit/UVLO Prog control pin (pin 11) using a single resistor (see Figure 18).  
When pin 11 is left open circuit, the ON threshold voltage is internally set to its default value, which is 1.95 volts.  
The ON threshold might need to be raised if the module is powered from a tightly regulated 5-V bus. Adjusting  
the threshold prevents the module from operating if the input bus fails to completely rise to its specified  
regulation voltage.  
Equation 5 determines the value of RUVLO required to adjust VTHD to a new value. The default value is 1.95 V,  
and it may only be adjusted to a higher value.  
68.54 * V  
THD  
R
+
kW  
UVLO  
V
* 2.07  
THD  
(5)  
Table 7 lists the standard resistor values for RUVLO for different values of the on-threshold (VTHD) voltage.  
Table 7. Standard RUVLO values for Various VTHD values  
VTHD(V)  
2.5  
3.0  
3.5  
4.0  
4.5  
RUVLO (kΩ)  
154  
71.5  
53.6  
33.2  
26.7  
PTH04T240W/241W  
V
I
2
V
I
Inhibit/  
UVLO Prog  
11  
+
GND  
C
I
3
4
R
UVLO  
GND  
UDG−06052  
Figure 18. Undervoltage Lockout Adjustment Resistor Placement  
22  
Submit Documentation Feedback  
 
 
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Soft-Start Power Up  
The Auto-Track feature allows the power-up of multiple PTH/PTV modules to be directly controlled from the  
Track pin. However in a stand-alone configuration, or when the Auto-Track feature is not being used, the Track  
pin should be directly connected to the input voltage, VI (see Figure 19).  
10  
Track  
PTH04T240W/241W  
V
I
2
V
I
+
GND  
3,4  
C
I
GND  
UDG−06044  
Figure 19. Defeating the Auto-Track Function  
When the Track pin is connected to the input voltage the Auto-Track function is permanently disengaged. This  
allows the module to power up entirely under the control of its internal soft-start circuitry. When power up is  
under soft-start control, the output voltage rises to the set-point at a quicker and more linear rate.  
From the moment a valid input voltage is applied, the soft-start control introduces a short time delay (typically  
2 ms–7 ms) before allowing the output voltage to rise.  
V (2 V/div)  
I
V
O
(1 V/div)  
I (2 A/div)  
I
T − Time − 4 ms/div  
Figure 20. Power-Up Waveform  
The output then progressively rises to the module’s setpoint voltage. Figure 20 shows the soft-start power-up  
characteristic of the PTH04T240/241W operating from a 5-V input bus and configured for a 1.8-V output. The  
waveforms were measured with a 10-A constant current load and the Auto-Track feature disabled. The initial  
rise in input current when the input voltage first starts to rise is the charge current drawn by the input capacitors.  
Power-up is complete within 20 ms.  
23  
Submit Documentation Feedback  
 
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
On/Off Inhibit  
For applications requiring output voltage on/off control, the PTH04T240/241W incorporates an Inhibit control pin.  
The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be  
turned off. The power modules function normally when the Inhibit pin is left open-circuit, providing a regulated  
output whenever a valid source voltage is connected to VI with respect to GND.  
Figure 21 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit input  
has its own internal pull-up. An external pull-up resistor should never be used with the inhibit pin. The input is  
not compatible with TTL logic devices. An open-collector (or open-drain) discrete transistor is recommended for  
control.  
PTH04T240W/241W  
V
I
2
V
I
11  
+
Inhibit/  
UVLO  
C
I
GND  
3,4  
1 = Inhibit  
GND  
Q1  
BSS138  
UDG−06045  
Figure 21. On/Off Inhibit Control Circuit  
Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then  
turned off, the module executes a soft-start power-up sequence. A regulated output voltage is produced within  
40 ms. Figure 22 shows the typical rise in both the output voltage and input current, following the turn-off of Q1.  
The turn off of Q1 corresponds to the rise in the waveform, VINH. The waveforms were measured with a 10-A  
constant current load.  
V
O
(1 V/div)  
I (2 A/div)  
I
V
INH  
(2 V/div)  
T − Time − 4 ms/div  
Figure 22. Power-Up Response from Inhibit Control  
24  
Submit Documentation Feedback  
 
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Smart Sync  
Smart Sync is a feature that allows multiple power modules to be synchronized to a common frequency. Driving  
the Smart Sync pins with an external oscillator set to the desired frequency, synchronizes all connected modules  
to the selected frequency. The synchronization frequency can be higher or lower than the nominal switching  
frequency of the modules within the range of 240 kHz to 400 kHz (see Electrical Specifications table for  
synchronization limits). Synchronizing modules powered from the same bus, eliminates beat frequencies  
reflected back to the input supply, and also reduces EMI filtering requirements. Eliminating the low beat  
frequencies (usually < 10 kHz) allows the EMI filter to be designed to attenuate only the synchronization  
frequency. Power modules can also be synchronized out of phase to minimize source current loading and  
minimize input capacitance requirements. Figure 23 shows a standard circuit with two modules syncronized 180°  
out of phase using a D flip-flop.  
0°  
Track  
SYNC  
TT  
+Sense  
V =5 V  
I
Vi  
V
O1  
PTH08T220W  
Vo  
Inhibit/  
UVLO  
SN74LVC2G74  
−Sense  
+
C
+
O1  
C
I1  
V
CC  
GND  
VoAdj  
220 µF  
PRE  
Q
330 µF  
CLR  
CLK  
R
SET1  
f
= 2 x f  
MODULE  
CLK  
180°  
Q
D
GND  
Track  
Sync  
TT  
Vi  
+Sense  
V
O2  
PTH04T240W  
Vo  
Inhibit/  
UVLO  
−Sense  
+
C
O2  
+
GND  
VoAdj  
C
I2  
220 µF  
220 µF  
R
SET2  
UDG−06051  
Figure 23. Smart Sync Schematic  
25  
Submit Documentation Feedback  
 
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Overcurrent Protection  
For protection against load faults, all modules incorporate output overcurrent protection. Applying a load that  
exceeds the regulator's overcurrent threshold causes the regulated output to shut down. Following shutdown,  
the module periodically attempts to recover by initiating a soft-start power-up. This is described as a hiccup  
mode of operation, whereby the module continues in a cycle of successive shutdown and power up until the  
load fault is removed. During this period, the average current flowing into the fault is significantly reduced. Once  
the fault is removed, the module automatically recovers and returns to normal operation.  
Overtemperature Protection (OTP)  
A thermal shutdown mechanism protects the module’s internal circuitry against excessively high temperatures. A  
rise in the internal temperature may be the result of a drop in airflow, or a high ambient temperature. If the  
internal temperature exceeds the OTP threshold, the module’s Inhibit control is internally pulled low. This turns  
the output off. The output voltage drops as the external output capacitors are discharged by the load circuit. The  
recovery is automatic, and begins with a soft-start power up. It occurs when the sensed temperature decreases  
by about 10°C below the trip point.  
The overtemperature protection is a last resort mechanism to prevent thermal stress to the regulator.  
Operation at or close to the thermal shutdown temperature is not recommended and reduces the long-term  
reliability of the module. Always operate the regulator within the specified safe operating area (SOA) limits  
for the worst-case conditions of ambient temperature and airflow.  
Differential Output Voltage Remote Sense  
Differential remote sense improves the load regulation performance of the module by allowing it to compensate  
for any IR voltage drop between its output and the load in either the positive or return path. An IR drop is caused  
by the output current flowing through the small amount of pin and trace resistance. With the sense pins  
connected, the difference between the voltage measured directly between the VO and GND pins, and that  
measured at the Sense pins, is the amount of IR drop being compensated by the regulator. This should be  
limited to a maximum of 0.3 V. Connecting the +Sense (pin 6) to the positive load terminal improves the load  
regulation at the connection point. For optimal behavior the –Sense (pin 7) must be connected to GND (pin 4)  
close to the module (within 10 cm).  
If the remote sense feature is not used at the load, connect the +Sense pin to VO (pin 5) and connect the  
–Sense pin to the module GND (pin 4).  
The remote sense feature is not designed to compensate for the forward drop of nonlinear or frequency  
dependent components that may be placed in series with the converter output. Examples include OR-ing  
diodes, filter inductors, ferrite beads, and fuses. When these components are enclosed by the remote sense  
connection they are effectively placed inside the regulation control loop, which can adversely affect the  
stability of the regulator.  
26  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Auto-Track™ Function  
The Auto-Track function is unique to the PTH/PTV family, and is available with all POLA products. Auto-Track  
was designed to simplify the amount of circuitry required to make the output voltage from each module power up  
and power down in sequence. The sequencing of two or more supply voltages during power up is a common  
requirement for complex mixed-signal applications that use dual-voltage VLSI ICs such as the TMS320™ DSP  
family, microprocessors, and ASICs.  
How Auto-Track™ Works  
(1)  
Auto-Track works by forcing the module output voltage to follow a voltage presented at the Track control pin  
.
This control range is limited to between 0 V and the module set-point voltage. Once the track-pin voltage is  
raised above the set-point voltage, the module output remains at its set-point (2). As an example, if the Track pin  
of a 2.5-V regulator is at 1 V, the regulated output is 1 V. If the voltage at the Track pin rises to 3 V, the  
regulated output does not go higher than 2.5 V.  
When under Auto-Track control, the regulated output from the module follows the voltage at its Track pin on a  
volt-for-volt basis. By connecting the Track pin of a number of these modules together, the output voltages follow  
a common signal during power up and power down. The control signal can be an externally generated master  
ramp waveform, or the output voltage from another power supply circuit (3). For convenience, the Track input  
incorporates an internal RC-charge circuit. This operates off the module input voltage to produce a suitable  
rising waveform at power up.  
Typical Application  
The basic implementation of Auto-Track allows for simultaneous voltage sequencing of a number of Auto-Track  
compliant modules. Connecting the Track inputs of two or more modules forces their track input to follow the  
same collective RC-ramp waveform, and allows their power-up sequence to be coordinated from a common  
Track control signal. This can be an open-collector (or open-drain) device, such as a power-up reset voltage  
supervisor IC. See U3 in Figure 24.  
To coordinate a power-up sequence, the Track control must first be pulled to ground potential. This should be  
done at or before input power is applied to the modules. The ground signal should be maintained for at least  
20 ms after input power has been applied. This brief period gives the modules time to complete their internal  
soft-start initialization (4), enabling them to produce an output voltage. A low-cost supply voltage supervisor IC,  
that includes a built-in time delay, is an ideal component for automatically controlling the Track inputs at power  
up.  
Figure 24 shows how a TPS3808 supply voltage supervisor IC (U3) can be used to coordinate the sequenced  
power up of 5-V PTH modules. The output of the TPS3808 supervisor becomes active above an input voltage of  
0.8 V, enabling it to assert a ground signal to the common track control well before the input voltage has  
reached the module's undervoltage lockout threshold. The ground signal is maintained until approximately 27 ms  
after the input voltage has risen above U3's voltage threshold, which is 4.65 V. The 27-ms time period is  
controlled by the capacitor C3. The value of 4700 pF provides sufficient time delay for the modules to complete  
their internal soft-start initialization. The output voltage of each module remains at zero until the track control  
voltage is allowed to rise. When U3 removes the ground signal, the track control voltage automatically rises.  
This causes the output voltage of each module to rise simultaneously with the other modules, until each reaches  
its respective set-point voltage.  
Figure 25 shows the output voltage waveforms after input voltage is applied to the circuit. The waveforms, VO1  
and VO2, represent the output voltages from the two power modules, U1 (3.3 V) and U2 (1.8 V), respectively.  
VTRK, VO1, and VO2 are shown rising together to produce the desired simultaneous power-up characteristic.  
The same circuit also provides a power-down sequence. When the input voltage falls below U3's voltage  
threshold, the ground signal is re-applied to the common track control. This pulls the track inputs to zero volts,  
forcing the output of each module to follow, as shown in Figure 26. Power down is normally complete before the  
input voltage has fallen below the modules' undervoltage lockout. This is an important constraint. Once the  
modules recognize that an input voltage is no longer present, their outputs can no longer follow the voltage  
applied at their track input. During a power-down sequence, the fall in the output voltage from the modules is  
limited by the Auto-Track slew rate capability.  
27  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Notes on Use of Auto-Track™  
1. The Track pin voltage must be allowed to rise above the module set-point voltage before the module  
regulates at its adjusted set-point voltage.  
2. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with ramp  
speeds of up to 1 V/ms.  
3. The absolute maximum voltage that may be applied to the Track pin is the input voltage VI.  
4. The module cannot follow a voltage at its track control input until it has completed its soft-start initialization.  
This takes about 20 ms from the time that a valid voltage has been applied to its input. During this period, it  
is recommended that the Track pin be held at ground potential.  
5. The Auto-Track function is disabled by connecting the Track pin to the input voltage (VI). When Auto-Track  
is disabled, the output voltage rises according to its softstart rate after input power has been applied.  
6. The Auto-Track pin should never be used to regulate the module's output voltage for long-term, steady-state  
operation.  
R
TT  
U1  
VI  
AutoTrack  
TurboTrans  
+Sense  
VI = 5 V  
VO  
PTH04T230W  
Vo1 = 3.3 V  
−Sense  
VO Adj  
GND  
+
C
I1  
C
O1  
RSET1  
1.21 kΩ  
U3  
6
VCC  
5
3
MR  
SENSE  
1
C4  
RESET  
0.1 µF  
TPS3808G50  
CT  
4
GND  
R
TT  
U2  
VI  
2
C3  
4700 pF  
AutoTrack  
TurboTrans  
+Sense  
VO  
PTH04T240W  
Vo2 = 1.8 V  
−Sense  
GND  
VO Adj  
C
O2  
+
C
I2  
RSET2  
4.75 kΩ  
Figure 24. Sequenced Power Up and Power Down Using Auto-Track  
28  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
V
TRK  
(1 V/div)  
V
TRK  
(1 V/div)  
V 1 (1 V/div)  
O
V 1 (1 V/div)  
O
V 2 (1 V/div)  
O
V 2 (1 V/div)  
O
T − Time − 200 µs/div  
T − Time − 20 ms/div  
Figure 25. Simultaneous Power Up  
With Auto-Track Control  
Figure 26. Simultaneous Power Down  
With Auto-Track Control  
Prebias Startup Capability  
A prebias startup condition occurs as a result of an external voltage being present at the output of a power  
module prior to its output becoming active. This often occurs in complex digital systems when current from  
another power source is backfed through a dual-supply logic component, such as an FPGA or ASIC. Another  
path might be via clamp diodes as part of a dual-supply power-up sequencing arrangement. A prebias can  
cause problems with power modules that incorporate synchronous rectifiers. This is because under most  
operating conditions, these types of modules can sink as well as source output current.  
The PTH family of power modules incorporate synchronous rectifiers, but does not sink current during startup(1),  
or whenever the Inhibit pin is held low. However, to ensure satisfactory operation of this function, certain  
conditions must be maintained(2). Figure 27 shows an application demonstrating the prebias startup capability.  
The startup waveforms are shown in Figure 28. Note that the output current (IO) is negligible until the output  
voltage rises above the voltage backfed through the intrinsic diodes.  
The prebias start-up feature is not compatible with Auto-Track. When the module is under Auto-Track control, it  
sinks current if the output voltage is below that of a back-feeding source. To ensure a pre-bias hold-off one of  
two approaches must be followed when input power is applied to the module. The Auto-Track function must  
either be disabled(3), or the module’s output held off (for at least 50 ms) using the Inhibit pin. Either approach  
ensures that the Track pin voltage is above the set-point voltage at start up.  
1. Startup includes the short delay (approximately 10 ms) prior to the output voltage rising, followed by the rise  
of the output voltage under the module’s internal soft-start control. Startup is complete when the output  
voltage has risen to either the set-point voltage or the voltage at the Track pin, whichever is lowest.  
2. To ensure that the regulator does not sink current when power is first applied (even with a ground signal  
applied to the Inhibit control pin), the input voltage must always be greater than the output voltage  
throughout the power-up and power-down sequence.  
3. The Auto-Track function can be disabled at power up by immediately applying a voltage to the module’s  
Track pin that is greater than its set-point voltage. This can be easily accomplished by connecting the Track  
pin to VI.  
29  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
3.3 V  
Track  
+Sense  
V
VI = 5 V  
Vo = 2.5 V  
Io  
V
PTH04T240W  
I
O
Inhibit GND Vadj  
-Sense  
VCCIO  
VCORE  
CO  
200 mF  
++ CI  
330 mF  
R
SET  
2.37 kW  
ASIC  
Figure 27. Application Circuit Demonstrating Prebias Startup  
VIN (1 V/div)  
VO (1 V/div)  
IO (2 A/div)  
t - Time = 4 ms/div  
Figure 28. Prebias Startup Waveforms  
30  
Submit Documentation Feedback  
PTH04T240W, PTH04T241W  
www.ti.com  
SLTS276–OCTOBER 2006  
Tape & Reel and Tray Drawings  
31  
Submit Documentation Feedback  
PACKAGE OPTION ADDENDUM  
www.ti.com  
3-Nov-2006  
PACKAGING INFORMATION  
Orderable Device  
PTH04T240WAD  
PTH04T240WAS  
PTH04T240WAST  
PTH04T240WAZ  
PTH04T240WAZT  
Status (1)  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
ACTIVE  
Package Package  
Pins Package Eco Plan (2) Lead/Ball Finish MSL Peak Temp (3)  
Qty  
Type  
Drawing  
DIP MOD  
ULE  
EAY  
11  
11  
11  
11  
11  
49  
TBD  
TBD  
TBD  
Call TI  
Call TI  
Call TI  
Call TI  
Call TI  
Call TI  
DIP MOD  
ULE  
EAZ  
EAZ  
BAZ  
BAZ  
49  
Level-1-235C-UNLIM  
Level-1-235C-UNLIM  
Level-3-260C-168 HR  
Level-3-260C-168 HR  
DIP MOD  
ULE  
250  
49  
DIP MOD  
ULE  
Pb-Free  
(RoHS)  
DIP MOD  
ULE  
250  
Pb-Free  
(RoHS)  
(1) The marketing status values are defined as follows:  
ACTIVE: Product device recommended for new designs.  
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.  
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in  
a new design.  
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.  
OBSOLETE: TI has discontinued the production of the device.  
(2)  
Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check  
http://www.ti.com/productcontent for the latest availability information and additional product content details.  
TBD: The Pb-Free/Green conversion plan has not been defined.  
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements  
for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered  
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.  
Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and  
package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS  
compatible) as defined above.  
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame  
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)  
(3)  
MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder  
temperature.  
Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is  
provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the  
accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take  
reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on  
incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited  
information may not be available for release.  
In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI  
to Customer on an annual basis.  
Addendum-Page 1  
IMPORTANT NOTICE  
Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications,  
enhancements, improvements, and other changes to its products and services at any time and to discontinue  
any product or service without notice. Customers should obtain the latest relevant information before placing  
orders and should verify that such information is current and complete. All products are sold subject to TI’s terms  
and conditions of sale supplied at the time of order acknowledgment.  
TI warrants performance of its hardware products to the specifications applicable at the time of sale in  
accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI  
deems necessary to support this warranty. Except where mandated by government requirements, testing of all  
parameters of each product is not necessarily performed.  
TI assumes no liability for applications assistance or customer product design. Customers are responsible for  
their products and applications using TI components. To minimize the risks associated with customer products  
and applications, customers should provide adequate design and operating safeguards.  
TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right,  
copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process  
in which TI products or services are used. Information published by TI regarding third-party products or services  
does not constitute a license from TI to use such products or services or a warranty or endorsement thereof.  
Use of such information may require a license from a third party under the patents or other intellectual property  
of the third party, or a license from TI under the patents or other intellectual property of TI.  
Reproduction of information in TI data books or data sheets is permissible only if reproduction is without  
alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction  
of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for  
such altered documentation.  
Resale of TI products or services with statements different from or beyond the parameters stated by TI for that  
product or service voids all express and any implied warranties for the associated TI product or service and  
is an unfair and deceptive business practice. TI is not responsible or liable for any such statements.  
Following are URLs where you can obtain information on other Texas Instruments products and application  
solutions:  
Products  
Applications  
Audio  
Amplifiers  
amplifier.ti.com  
www.ti.com/audio  
Data Converters  
dataconverter.ti.com  
Automotive  
www.ti.com/automotive  
DSP  
dsp.ti.com  
Broadband  
Digital Control  
Military  
www.ti.com/broadband  
www.ti.com/digitalcontrol  
www.ti.com/military  
Interface  
Logic  
interface.ti.com  
logic.ti.com  
Power Mgmt  
Microcontrollers  
power.ti.com  
Optical Networking  
Security  
www.ti.com/opticalnetwork  
www.ti.com/security  
www.ti.com/telephony  
www.ti.com/video  
microcontroller.ti.com  
Low Power Wireless www.ti.com/lpw  
Telephony  
Video & Imaging  
Wireless  
www.ti.com/wireless  
Mailing Address:  
Texas Instruments  
Post Office Box 655303 Dallas, Texas 75265  
Copyright 2006, Texas Instruments Incorporated  

相关型号：

PTH04T240WAD

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T240WAS

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T240WAST

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T240WAZ

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T240WAZT

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T241W

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS⑩
TI

PTH04T241WAD

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T241WAS

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T241WAST

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T241WAZ

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T241WAZT

 10-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
TI

PTH04T260W

 3-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans⑩
TI
©2020 ICPDF网 联系我们和版权申明