PTH04T220W_15 [TI]
16-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANSâ¢;
| 型号： | PTH04T220W_15 |
| 厂家： | 
TEXAS INSTRUMENTS |
| 描述： | 16-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS⢠输入元件 输出元件 |
| 文件： | 总38页 (文件大小：1065K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PTH04T220W, PTH04T221W
www.ti.com ................................................................................................................................................... SLTS275D–DECEMBER 2006–REVISED JULY 2009
16-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED,
WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS™
1
FEATURES
2
•
•
•
•
•
•
Up to 16-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:
–
UL/IEC/CSA-C22.2 60950-1
•
•
•
•
•
•
•
Prebias Startup
On/Off Inhibit
Differential Output Voltage Remote Sense
Adjustable Undervoltage Lockout
Auto-Track™ Sequencing
Ceramic Capacitor Version (PTH04T221W)
POLA™ Compatible
DESCRIPTION
The PTH04T220/221W is the lower input voltage (2.2V to 5.5V) version of the PTH08T220/221W (4.5V to 14V),
16-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 PTH04T221W is optimized to be
used with all ceramic capacitors.
Operating from an input voltage range of 2.2V to 5.5V, the PTH04T220/221W requires a single resistor to set the
output voltage to any value over the range, 0.69V to 3.6V. The wide input voltage range makes the
PTH04T220/221W 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 PTH04T220/221W 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.
Double-sided surface mount construction provides a low profile and compact footprint. Package options include
both through-hole and surface mount configurations that are lead (Pb) - free and RoHS compatible.
1
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.
2
Auto-Track, POLA, TurboTrans, TurboTrans, TMS320 are trademarks of Texas Instruments.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2006–2009, Texas Instruments Incorporated
PTH04T220W, PTH04T221W
SLTS275D–DECEMBER 2006–REVISED JULY 2009 ................................................................................................................................................... www.ti.com
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.
PTH04T220W
SmartSync
Track
TurboTranst
R
TT
1%
9
8
11
0.05 W
(Optional)
V
Track SYNC
TT
I
5
4
6
+Sense
1
+Sense
V
I
V
O
V
O
PTH04T220W
Inhibit
10
INH/UVLO
GND
−Sense
L
O
A
D
GND
3
V Adj
O
+
+
C
O
2
7
R
[A]
220 µF
(Required)
SET
C 2
I
22 µF
(Optional)
R
1%
0.05 W
C
1%
0.05 W
(Required)
UVLO
I
330 µF
(Required)
−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.
PTH04T221W - Ceramic Capacitor Version
SmartSync
Track
TurboTranst
R
TT
1%
9
11
8
0.05 W
(Optional)
Track SYNC
TT
VI
5
4
6
+Sense
1
+Sense
V
I
V
O
V
O
PTH04T221W
Inhibit
10
INH/UVLO
GND
−Sense
L
O
A
D
GND
3
V Adj
O
C
O
2
7
R
[A]
300 µF
(Required)
SET
R
1%
0.05 W
(Optional)
1%
0.05 W
(Required)
C
I
UVLO
300 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.
B. 300 µF of ceramic or 330 µF of electrolytic input capacitance is required for proper operation.
2
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Product Folder Link(s): PTH04T220W PTH04T221W
PTH04T220W, PTH04T221W
www.ti.com ................................................................................................................................................... SLTS275D–DECEMBER 2006–REVISED JULY 2009
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 (PTH04T220W)
ELECTRICAL CHARACTERISTICS TABLE (PTH04T221W)
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 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
V
VTrack Track pin voltage
VSYNC SYNC pin voltage
–0.3 to VI + 0.3
–0.3 to 6.0
–40 to 85
260
V
TA
Operating temperature range Over VI range
Surface temperature of module body or pins
for 5 seconds maximum.
Twave Wave soldering temperature
Treflow Solder reflow temperature
suffix AD
suffix AS
suffix AZ
235(1)
260(1)
–55 to 125
45
°C
Surface temperature of module body or pins
Tstg
Storage temperature
Packaging temperature
Mechanical shock
Storage temperature of module removed from shipping package
Shipping Tray or Tape and Reel storage or bake temperature
Per Mil-STD-883D, Method 2002.3, 1 msec, 1/2 sine, mounted
Tpkg
250
Mil-STD-883D, Method 2007.2, 20-2000 Hz
suffix AD
suffix AS & AZ
20
G
Mechanical vibration
10
Weight
5.3
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.
Copyright © 2006–2009, Texas Instruments Incorporated
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PTH04T220W, PTH04T221W
SLTS275D–DECEMBER 2006–REVISED JULY 2009 ................................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS
PTH04T220W
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 330 µF, CO = 220 µF, and IO = IO max (unless otherwise stated)
PARAMETER
TEST CONDITIONS
PTH04T220W
UNIT
MIN
TYP
MAX
16
IO
Output current
Over VO range
Over IO range
Over IO range
25°C, natural convection
0
A
V
0.69 ≤ VO ≤ 1.7
1.7 < VO ≤ 3.6
2.2
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
91
RSET = 2.38 kΩ, VO = 2.5 V
RSET = 4.78 kΩ, VO = 1.8 V
88
η
Efficiency
IO = 16 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
87
84
82
76
VO Ripple (peak-to-peak)
Overcurrent threshold
20-MHz bandwidth
20
mVPP
A
ILIM
ttr
Reset, followed by auto-recovery
32
Recovery time
VO over/undershoot
Recovery time
80
µs
w/o TurboTrans
CO = 220 µF, TypeC
ΔVtr
ttrTT
2.5 A/µs load step
50 to 100% IOmax
VO = 2.5 V
140
380
mV
µs
Transient response
w/ TurboTrans
CO = 2000 µF, TypeC,
RTT = 0 Ω
mV
ΔVtrTT
VO over/undershoot
35
IIL
Track input current (pin 9)
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 10)
1.3
V
0.5
Input high voltage (VIH
)
Open(4)
0.8
V
Inhibit control (pin 10)
Input low voltage (VIL)
-0.2
Input low current (IIL), Pin 10 to GND
-235
5
µA
mA
kHz
II
Input standby current
Switching frequency
Inhibit (pin 10) to GND, Track (pin 9) open
f s
Over VI and IO ranges, SmartSync (pin 11) 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
330
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 9. 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
3.5Vdc. For additional information, see the related application information section.
(5) A 330 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
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Product Folder Link(s): PTH04T220W PTH04T221W
PTH04T220W, PTH04T221W
www.ti.com ................................................................................................................................................... SLTS275D–DECEMBER 2006–REVISED JULY 2009
ELECTRICAL CHARACTERISTICS (continued)
PTH04T220W
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 330 µF, CO = 220 µF, and IO = IO max (unless otherwise stated)
PARAMETER
TEST CONDITIONS
PTH04T220W
MIN TYP
UNIT
MAX
(6)
(7)
Nonceramic
Ceramic
220
2500
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
(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.
Copyright © 2006–2009, Texas Instruments Incorporated
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PTH04T220W, PTH04T221W
SLTS275D–DECEMBER 2006–REVISED JULY 2009 ................................................................................................................................................... www.ti.com
ELECTRICAL CHARACTERISTICS
PTH04T221W (Ceramic Capacitors)
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 300 µF ceramic, CO = 300 µF ceramic, and IO = IO max (unless otherwise stated)
PARAMETER
TEST CONDITIONS
PTH04T221W
UNIT
MIN
TYP
MAX
16
IO
Output current
Over VO range
Over IO range
Over IO range
25°C, natural convection
0
A
V
0.69 ≤ VO ≤ 1.7
1.7 < VO ≤ 3.6 VO+0.5(1)
2.2
5.5
5.5
3.6
VI
Input voltage range
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
91
RSET = 2.38 kΩ, VO = 2.5 V
RSET = 4.78 kΩ, VO = 1.8 V
88
η
Efficiency
IO = 16 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
87
84
82
76
VO Ripple (peak-to-peak)
Overcurrent threshold
20-MHz bandwidth
20
mVPP
A
ILIM
ttr
Reset, followed by auto-recovery
32
Recovery time
60
µs
w/o TurboTrans
CO= 300 µF, TypeA
ΔVtr
ttrTT
2.5 A/µs load step
50 to 100% IOmax
VO = 2.5 V
VO over/undershoot
145
220
mV
µs
Transient response
w/ TurboTrans
CO= 2000 µF, TypeA
RTT = short
Recovery time
mV
ΔVtrTT
VO over/undershoot
50
IIL
Track input current (pin 9)
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 10)
1.30
-0.2
V
Input high voltage (VIH
)
Open(4)
0.8
V
Inhibit control (pin 10)
Input low voltage (VIL)
Input low current (IIL ), Pin 10 to GND
-235
5
µA
mA
kHz
II
Input standby current
Switching frequency
Inhibit (pin 10) to GND, Track (pin 9) open
f s
Over VI and IO ranges, SmartSync (pin 11) to GND
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)
300
(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 9. 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
3.5Vdc. For additional information, see the related application note.
(5) 300 µF of input capacitance is required for proper operation. 300 µF of ceramic or 330 µF of electrolytic input capacitance can be used.
Electrolytic capacitance must be rated for a minimum of 700 mA rms of ripple current. An additional 22-µF ceramic input capacitor is
recommended to reduce rms ripple current.
6
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Product Folder Link(s): PTH04T220W PTH04T221W
PTH04T220W, PTH04T221W
www.ti.com ................................................................................................................................................... SLTS275D–DECEMBER 2006–REVISED JULY 2009
ELECTRICAL CHARACTERISTICS (continued)
PTH04T221W (Ceramic Capacitors)
TA = 25°C, VI = 5 V, VO = 3.3 V, CI = 300 µF ceramic, CO = 300 µF ceramic, and IO = IO max (unless otherwise stated)
PARAMETER
TEST CONDITIONS
PTH04T221W
MIN TYP
UNIT
MAX
(6)
(7)
w/o TurboTrans
w/ TurboTrans
Capacitance Value
Ceramic
300
1500
µF
µF
see table
CO
External output capacitance
Reliability
Capacitance Value
(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.
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TERMINAL FUNCTIONS
TERMINAL
DESCRIPTION
NAME
VI
NO.
1
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
4
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
2, 3
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
10
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 directly connected between this pin and pin6 (–Sense) to set the output voltage to
a value higher than 0.69V. The temperature stability of the resistor should be 100 ppm/°C (or better). The
setpoint range for the output voltage is from 0.69V to 3.6V. 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
7
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
5
6
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 (pin3) very close to the module (within 10cm).
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
9
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%, 50mW
resistor must be connected between this pin and pin 5 (+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™
8
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 PTH04T220/221W modules, aiding EMI
noise suppression efforts. If unused, this pin should be connected to GND (pin3). For more information, please
review the Application Information section.
SmartSync
11
(1) Denotes negative logic: Open = Normal operation, Ground = Function active
11 10
9
8
7
6
5
4
1
PTH04T220/221W
(TOP VIEW)
2
3
8
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Product Folder Link(s): PTH04T220W PTH04T221W
PTH04T220W, PTH04T221W
www.ti.com ................................................................................................................................................... SLTS275D–DECEMBER 2006–REVISED JULY 2009
TYPICAL CHARACTERISTICS(1)(2)
CHARACTERISTIC DATA (VI = 5 V)
EFFICIENCY
vs
LOAD CURRENT
OUTPUT RIPPLE
vs
LOAD CURRENT
POWER DISSIPATION
vs
LOAD CURRENT
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
100
30
3.3 V
2.5 V
V
O
V
O
3.3 V
1.8 V
1.2 V
0.7 V
95
90
3.3 V
3.3 V
1.8 V
1.2 V
0.7 V
26
22
1.8 V
85
80
1.8
V
1.0 V
1.2 V
75
70
18
14
1.8
V
O
0.7 V
V
0.7 V
65
60
55
50
3.3 V
2.5 V
1.8 V
1.2 V
1.0 V
0.7 V
1.2 V
12
10
1.2 V
0.7 V
14
6
0
2
4
6
8
10
14
16
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
16
I
O
− Output Current − A
I
O
− Output Current − A
I
O
− Output Current − A
Figure 1.
Figure 2.
Figure 3.
SAFE OPERATING AREA
SAFE OPERATING AREA
90
80
90
80
200 LFM
200 LFM
70
60
100 LFM
70
60
100 LFM
Natural Convection
Natural Convection
50
50
40
30
40
30
LFM, V = 1.0 V
O
LFM, V = 3.3 V
O
200
100
200
100
Natural Convection
Natural Convection
20
20
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
I
O
− Output Current − A
I
O
− Output Current − A
Figure 4.
Figure 5.
(1) The electrical characteristic data has been developed from actual products tested at 25C. 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.
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TYPICAL CHARACTERISTICS(1)(2)
CHARACTERISTIC DATA (VI = 3.3 V)
EFFICIENCY
vs
LOAD CURRENT
OUTPUT RIPPLE
vs
LOAD CURRENT
POWER DISSIPATION
vs
LOAD CURRENT
18
16
100
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
2.5 V
1.8 V
V
O
1.2 V
95
90
2.5V
1.8V
1.2V
0.7V
1.8
V
1.2 V
85
80
14
12
10
0.7 V
1.0 V
1.2 V
75
70
0.7 V
2.5 V
65
60
55
50
V
O
V
O
2.5V
2.5V
1.2V
0.7V
1.8V
1.2V
1.0V
0.7V
8
6
0.7 V
12 14
2.5 V
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
16
0
2
4
6
8
10
12
14
16
I
O
− Output Current − A
I
O
− Output Current − A
I
O
− Output Current − A
Figure 6.
Figure 7.
Figure 8.
SAFE OPERATING AREA
SAFE OPERATING AREA
90
80
90
80
200 LFM
200 LFM
70
60
70
60
100 LFM
100 LFM
Natural Convection
Natural Convection
50
50
40
30
40
30
LFM, V = 1.0 V
O
LFM, V = 2.5 V
O
200
100
200
100
Natural Convection
Natural Convection
20
20
0
2
4
6
8
10
12
14
16
0
2
4
6
8
10
12
14
16
I
O
− Output Current − A
I
O
− Output Current − A
Figure 9.
Figure 10.
(1) The electrical characteristic data has been developed from actual products tested at 25C. This data is considered typical for the
converter. Applies to Figure 6, Figure 7, and Figure 8.
(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 9.
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APPLICATION INFORMATION
ADJUSTING THE OUTPUT VOLTAGE
The Vo Adjust control (pin 7) sets the output voltage of the PTH04T220/221W. 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 11 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)
(1)
(1)
(1)
3.3
2.5
1.8
1.5
1.21
2.37
4.75
6.98
12.1
20.5
681
2.506
1.807
1.510
1.2
1.200
1
1.004
0.7
0.700
(1) The minimum input voltage is 2.2 V or (VO + 0.5) V, whichever is greater.
+Sense
5
+Sense
PTH04T220W/221W
V
O
4
6
V
O
−Sense
GND
2,3
V Adj
O
7
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 7) and -Sense (pin 6), as close to the regulator as possible, using dedicated
PCB traces.
(2) Never connect capacitors from VO Adjust (pin 7) to either +Sense (pin 5), GND, or VO (pin 4). Any capacitance added
to the VO Adjust pin affects the stability of the regulator.
Figure 11. VO Adjust Resistor Placement
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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.
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CAPACITOR RECOMMENDATIONS FOR THE PTH04T220/221W 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 PTH04T221W requires a minimum input capacitance of 300µF of ceramic type.
The PTH04T220W requires a minimum input capacitance of 330µF. The ripple current rating of the input
capacitor must be at least 500mArms. An optional 22µF 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 680µF 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.
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Output Capacitor (Required)
The PTH04T221W requires a minimum output capacitance of 300µF of ceramic type.
The PTH04T220W requires a minimum output capacitance of 220µF 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 10µF 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 PTH04T221W should be used when only Type A (ceramic) capacitors are used on the output.
Working Examples:
A capacitor with a capacitance of 330µF and an ESR of 5mΩ, has a C×ESR product of 1650µFxmΩ (330µF ×
5mΩ). This is a Type B capacitor. A capacitor with a capacitance of 1000µF and an ESR of 8mΩ, has a C×ESR
product of 8000µFxmΩ (1000µF × 8mΩ). 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 PTH04T220W, observe the minimum ESR of the entire output capacitor bank. The minimum
ESR limit of the output capacitor bank is 7mΩ. A list of preferred low-ESR type capacitors, are identified in
Table 3.
When using the PTH04T221W without the TurboTrans feature, the maximum amount of capacitance is 1500µF
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.
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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
2.5A/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 100A/µs, adding
multiple 10µF ceramic capacitors plus 10×1µF, and numerous high frequency ceramics (≤0.1µF) 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
Value
(µF)
Current
at 85°C
(Irms)
(mA)
Physical
Size (mm)
Input
Bus
No
Turbo-
Trans
at 100
kHz
Vendor Part No.
Capacitor
Type(3)
(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)
B ≥ 2(3)
N/R(4)
B ≥ 2(3)
B ≥ 1(3)
6PTB337MD6TER
LXZ6.3VB681M8X12LL
6PS390MH11
4770
3000
670
8 X 11,5
7,3×4,3
≤ 1
1
40
6PT337MD8TER
150
14
10 × 10
1
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)
EEFSE0J391R(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:
a. Type A = (100 < capacitance × ESR ≤ 1000)
b. Type B = (1,000 < capacitance × ESR ≤ 5,000)
c. 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.
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Table 3. Input/Output Capacitors (continued)
Capacitor Characteristics
Quantity
(2)
Max
Max
Output Bus
Ripple
Capacitor Vendor,
Type Series (Style)
Working
Voltage
(V)
ESR
Turbo-
Trans
Value
(µF)
Current
at 85°C
(Irms)
(mA)
Physical
Size (mm)
Input
Bus
No
Turbo-
Trans
at 100
kHz
Vendor Part No.
Capacitor
Type(3)
(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
N/R(11)
1 ≤ 2
1 ≤ 2
1 ≤ 3
C ≥ 1(8)
B ≥ 2(8)
B ≥ 1(8)
C ≥ 1(8)
C ≥ 2(8)
C ≥ 1(8)
10TPE330MF
N/R(9)
N/R(9)
2R5TPE470M7(VO≤ 1.8V)(10)
2R5TPD1000M5(VO≤ 1.8V)(10)
6SEP470M
5
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
7,3×6,1×3.5 N/R(9)
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
TPSV108K004R0035 (VO≤ 2.1V)(13)
1000
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
7,3×4,3×4,1 N/R(9)
7,3×4,3×4,1 N/R(9)
1
1
1 ≤ 3
1 ≤ 2
N/R(11)
N/R(11)
C ≥ 2(8)
B ≥ 2(8)
B ≥ 1(8)
B ≥ 1(8)
T520X337M010ASE025
T530X337M010ASE015(10)
T530X687M004ASE005 (VO≤ 3.2V)(10)
T530X108M2R5ASE005 (VO≤ 2.0V)(10)
T530 (SMD)
T530 (SMD)
680
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)
A(8)
A(8)
A(8)
A(8)
A(8)
A(8)
597D337X010E2T
94SP397X06R3EBP
94SVP337X06F12
1 ≤ 2
1(14)
3225
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)
Murata, Ceramic X5R
(SMD)
100
47
2
–
3225
3225
22
16
10
TDK, Ceramic X5R
(SMD)
6.3
6.3
16
100
47
2
–
A(8)
A(8)
A(8)
10
16
22
(8) Required capacitors with TurboTrans. See the TurboTrans Application information for Capacitor Selection
Capacitor Types:
a. Type A = (100 < capacitance × ESR ≤ 1000)
b. Type B = (1,000 < capacitance × ESR ≤ 5,000)
c. 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.
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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 (pin5) and the TurboTrans pin
(pin8). 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
PTH04T220W, the minimum required capacitance is 220µF. The minimum required capacitance for the
PTH04T221W is 300µF 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 12 thru Figure 17 show the amount of output capacitance required to meet a desired transient voltage
deviation with and without TurboTrans for several capacitor types; TypeA (e.g. ceramic), TypeB (e.g.
polymer-tantalum), and TypeC (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 12 thru
Figure 17 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%(2.5A), 50%(5A), and 75%(7.5A) 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 5A, 50% load transient. A
majority of 330µF, 10 mΩ ouput capacitors will be used. Use the 5-V, Type B capacitor chart, Figure 14. Dividing
50mV by 5A gives 10mV/A transient voltage deviation per amp of transient load step. Select 10mV/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 760µF. The required RTT resistor value for 760µF can then be
calculated or selected from Table 5. The required RTT resistor is approximately 4.99kΩ.
To see the benefit of TurboTrans, follow the 10mV/A marking across to the 'Without TurboTrans' plot. Following
that point down shows that you would need a minimum of 2700µF of output capacitance to meet the same
transient deviation limit. This is the benefit of TurboTrans.
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PTH04T221W - Type A Ceramic Capacitors
5-V Input
3.3-V Input
30
20
30
20
Without TurboTrans
Without TurboTrans
10
9
10
9
8
8
7
6
7
6
5
4
5
4
With TurboTrans
With TurboTrans
PTH04T221 Type A
Ceramic Capacitors
3
2
3
2
PTH04T221 Type A
Ceramic Capacitors
Figure 12. Capacitor Type A, 100 ≤ C(µF)×ESR(mΩ) ≤
Figure 13. Capacitor Type A, 100 ≤ C(µF)xESR(mΩ) ≤
1000 (e.g. Ceramic)
1000 (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
(4 A)
50% load step
(8 A)
75% load step
(12 A)
CO
Minimum
RTT
Required
CO
Minimum
RTT
Required
Required Output
Capacitance (µF)
TurboTrans
Resistor (kΩ)
Required Output
Capacitance (µF)
TurboTrans
Resistor (kΩ)
90
75
50
40
35
30
25
180
150
100
80
270
225
150
120
105
90
300
300
open
open
31.6
13.0
7.32
2.67
short
300
370
open
133
540
680
17.4
6.65
2.67
short
short
760
960
70
930
1200
1500
2900
60
1200
1600
50
75
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
TT + 40
ƪǒ
Ǔ
ƫ
5 COń1500 * 1
(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 > 1500µF).
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.
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PTH04T220W Type B Capacitors
5-V Input
3.3-V Input
20
20
Without TurboTrans
Without TurboTrans
10
9
10
9
8
7
6
8
7
6
5
4
5
4
With TurboTrans
With TurboTrans
3
2
3
2
C − Capacitance − µF
C − Capacitance − µF
Figure 14. Capacitor Type B, 1000 < C(µF)×ESR(mΩ) ≤
Figure 15. Capacitor Type B, 1000 < C(µF)×ESR(mΩ) ≤
5000 (e.g. Polymer-Tantalum)
5000 (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
(4 A)
50% load step
(8 A)
75% load step
(12 A)
CO
Minimum
RTT
Required
CO
Minimum
RTT
Required
Required Output
Capacitance (µF)
TurboTrans
Resistor (kΩ)
Required Output
Capacitance (µF)
TurboTrans
Resistor (kΩ)
80
70
60
50
40
30
25
20
15
160
140
120
100
80
240
210
180
150
120
90
220
230
open
698
220
250
open
243
280
110
310
71.5
30.9
13.3
3.57
short
short
short
370
39.2
16.9
4.99
1.02
short
short
400
500
550
60
760
830
50
75
1000
1900
5900
1100
2500
7600
40
60
30
45
RTT Resistor Selection
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming, see Equation 3.
ƪ
ǒ
Ǔƫ
40 1 * COń1100
( )
kW
RTT
+
ǒǒ Ǔ
Ǔ
ƪ
ƫ
CO ń220 * 1
(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 > 1100µF).
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.
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PTH04T220W Type C Capacitors
5-V Input
3.3-V Input
20
20
Without TurboTrans
Without TurboTrans
10
9
10
9
8
7
6
8
7
6
5
4
5
4
With TurboTrans
With TurboTrans
3
2
3
2
C − Capacitance − µF
C − Capacitance − µF
Figure 16. Capacitor Type C, 5000 < C(µF)×ESR(mΩ) ≤
Figure 17. Capacitor Type C, 5000 < C(µF)×ESR(mΩ) ≤
10,000 (e.g. OS-CON)
10,000 (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
(4 A)
50% load step
(8 A)
75% load step
(12 A)
CO
Minimum
RTT
Required
CO
Minimum
RTT
Required
Required Output
Capacitance (µF)
TurboTrans
Resistor (kΩ)
Required Output
Capacitance (µF)
TurboTrans
Resistor (kΩ)
80
70
60
50
40
30
25
20
15
160
140
120
100
80
240
210
180
150
120
90
220
250
310
390
520
750
940
1650
5800
open
226
230
270
698
133
69.8
33.2
15.4
5.23
1.78
short
short
330
56.2
23.7
11.5
3.16
short
short
short
440
580
60
850
50
75
1100
2600
8000
40
60
30
45
RTT Resistor Selection
The TurboTrans resistor value, RTT can be determined from the TurboTrans programming, see Equation 4.
ƪ
ǒ
Ǔƫ
40 1 * COń1100
( )
kW
RTT
+
ǒǒ Ǔ
Ǔ
ƪ
ƫ
CO ń220 * 1
(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 > 1100µF).
To ensure stability, the value of RTT must be calculated using the minimum required output capacitance
determined from the capacitor transient response charts above.
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TurboTrans
R
0 Ω
8
TT
9
Auto
Track
TurboTrans
11
1
Smart Sync
+Sense
5
4
6
+Sense
V
I
V
I
V
O
V
PTH04T220W
O
10
Inhibit/Prog
UVLO
−Sense
V Adj
L
O
A
D
GND
O
+
C
O
+
2
3
7
C
I
1220 µF
Type B
R
1%
SET
330 µF
(Required)
0.05 W
−Sense
GND
GND
UDG−06073
Figure 18. Typical TurboTrans™ Application
PTH04T220W
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 19. Typical TurboTrans™ Waveforms
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UNDERVOLTAGE LOCKOUT (UVLO)
The PTH04T220/221W 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 PTH04T220/221W module allows for limited adjustment of the ON threshold voltage.
The adjustment is made via the Inhbit/UVLO Prog control pin (pin 10) using a single resistor (see Figure 20).
When pin 10 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
PTH04T220W/221W
V
I
1
V
I
Inhibit/
UVLO Prog
10
+
GND
C
I
2
3
R
UVLO
GND
UDG−06052
Figure 20. Undervoltage Lockout Adjustment Resistor Placement
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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 21).
9
Track
PTH04T220W/221W
V
I
1
V
I
+
GND
2,3
C
I
GND
UDG−06044
Figure 21. 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 (5 A/div)
I
T − Time − 4 ms/div
Figure 22. Power-Up Waveform
The output then progressively rises to the module’s setpoint voltage. Figure 22 shows the soft-start power-up
characteristic of the PTH04T220/221W 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 40 ms.
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On/Off Inhibit
For applications requiring output voltage on/off control, the PTH04T220/221W 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 23 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.
PTH04T220W/221W
V
I
1
V
I
10
+
Inhibit/
UVLO
C
I
GND
2,3
1 = Inhibit
GND
Q1
BSS138
UDG−06045
Figure 23. 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 24 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 (5 A/div)
I
V
INH
(2 V/div)
T − Time − 4 ms/div
Figure 24. Power-Up Response from Inhibit Control
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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 25 shows a standard circuit with two modules syncronized 180°
out of phase using a D flip-flop.
0°
Track
SYNC
TT
V = 5 V
I
Vi
+Sense
V
O1
PTH04T220W
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
PTH04T220W
Vo
Inhibit/
UVLO
−Sense
+
C
O2
+
GND
VoAdj
C
I2
220 µF
330 µF
R
SET2
UDG−06051
Figure 25. Smart Sync Schematic
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The maximum input voltage allowed for proper synchronization is duty cycle limited. When using Smart Sync, the
maximum allowable input voltage varies as a function of output voltage and switching frequency. Operationally,
the maximum input voltage is inversely proportional to switching frequency. Synchronizing to a higher frequency
causes restrictions on the input voltage range. For a given switching frequency, Figure 26 shows how the
maximum input voltage varies with output voltage.
For example, for a module operating at 400kHz and an output voltage of 0.8V, the maximum input voltage is
5.3V. Exceeding the maximum input voltage may cause in an increase in output ripple voltage and increased
output voltage variation.
As shown in Figure 26, the input voltage and output voltage limits apply when synchronizing to frequencies
greater than the free-running frequency. See the Electrical Characteristics table for the synchronization frequency
range limits.
Maximum Input Voltage
vs
Minimum Output Voltage
6.0
325 kHz
5.5
5.0
4.5
400 kHz
375 kHz
350 kHz
325 kHz
350 kHz
375 kHz
400 kHz
4.0
3.5
0.7
0.8
0.9
1.0
1.1
1.2
V
O(min)
− Minimum Output Voltage − V
UDG−06072
Figure 26.
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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 0.3V. Connecting the +Sense (pin 5) to the positive load terminal improves the load
regulation at the connection point. For optimal behavior the –Sense (pin 6) must be connected to GND (pin 3)
close to the module (within 10 cm).
If the remote sense feature is not used at the load, connect the +Sense pin to VO (pin4) and connect the –Sense
pin to the module GND (pin 3).
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.
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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 27.
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 27 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 27ms after the
input voltage has risen above U3's voltage threshold, which is 4.65V. The 27-ms time period is controlled by the
capacitor C3. The value of 4700pF 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 28 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 29. 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.
28
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Product Folder Link(s): PTH04T220W PTH04T221W
PTH04T220W, PTH04T221W
www.ti.com ................................................................................................................................................... SLTS275D–DECEMBER 2006–REVISED JULY 2009
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.
RTT
U1
AutoTrack
TurboTrans
+Sense
VI = 5 V
VI
VO
PTH04T230W
Vo1 = 3.3 V
−Sense
VO Adj
GND
+
CI1
CO1
RSET1
1.21 kΩ
U3
6
VCC
5
3
MR
SENSE
1
C4
RESET
0.1 µF
TPS3808G50
CT
4
GND
RTT
U2
VI
2
C3
4700 pF
AutoTrack
TurboTrans
+Sense
VO
PTH04T220W
Vo2 = 1.8 V
−Sense
GND
VO Adj
CO2
+
CI2
RSET2
4.75 kΩ
Figure 27. Sequenced Power Up and Power Down Using Auto-Track
Copyright © 2006–2009, Texas Instruments Incorporated
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PTH04T220W, PTH04T221W
SLTS275D–DECEMBER 2006–REVISED JULY 2009 ................................................................................................................................................... www.ti.com
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 28. Simultaneous Power Up
With Auto-Track Control
Figure 29. 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 30 shows an application demonstrating the prebias startup capability.
The startup waveforms are shown in Figure 31. 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.
30
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Product Folder Link(s): PTH04T220W PTH04T221W
PTH04T220W, PTH04T221W
www.ti.com ................................................................................................................................................... SLTS275D–DECEMBER 2006–REVISED JULY 2009
Track
+Sense
3.3 V
V = 5 V
I
V
O
= 2.5 V
V
O
V
I
PTH04T220W
I
O
V Adj
O
Inhibit
GND
−Sense
+
C
O
V
CCIO
V
CORE
R
SET
C
200 µF
I
2.37 kΩ
330 µF
ASIC
UDG−06084
Figure 30. Application Circuit Demonstrating Prebias Startup
VIN (1 V/div)
VO (1 V/div)
IO (2 A/div)
t - Time = 4 ms/div
Figure 31. Prebias Startup Waveforms
Copyright © 2006–2009, Texas Instruments Incorporated
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31
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PTH04T220W, PTH04T221W
SLTS275D–DECEMBER 2006–REVISED JULY 2009 ................................................................................................................................................... www.ti.com
Tape & Reel and Tray Drawings
32
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Product Folder Link(s): PTH04T220W PTH04T221W
PACKAGE OPTION ADDENDUM
www.ti.com
24-Aug-2014
PACKAGING INFORMATION
Orderable Device
PTH04T220WAD
PTH04T220WAS
PTH04T220WAST
PTH04T220WAZ
PTH04T220WAZT
PTH04T221WAD
PTH04T221WAS
PTH04T221WAZ
PTH04T221WAZT
Status Package Type Package Pins Package
Eco Plan
Lead/Ball Finish
MSL Peak Temp
Op Temp (°C)
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
-40 to 85
Device Marking
Samples
Drawing
Qty
(1)
(2)
(6)
(3)
(4/5)
ACTIVE
Through-
Hole Module
EBP
11
11
11
11
11
11
11
11
11
42
Pb-Free
(RoHS)
SN
Level-1-235C-UNLIM/
Level-3-260C-168HRS
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
ACTIVE
Surface
Mount Module
EBQ
EBQ
BBQ
BBQ
EBP
EBQ
BBQ
BBQ
42
250
42
TBD
SNPB
Level-1-235C-UNLIM/
Level-3-260C-168HRS
Surface
Mount Module
TBD
SNPB
Level-1-235C-UNLIM/
Level-3-260C-168HRS
Surface
Mount Module
Pb-Free
(RoHS)
SNAGCU
SNAGCU
SN
Level-3-260C-168 HR
Level-3-260C-168 HR
N / A for Pkg Type
Surface
Mount Module
250
42
Pb-Free
(RoHS)
Through-
Hole Module
Pb-Free
(RoHS)
Surface
Mount Module
42
TBD
SNPB
Level-1-235C-UNLIM/
Level-3-260C-168HRS
Surface
Mount Module
42
Pb-Free
(RoHS)
SNAGCU
SNAGCU
Level-3-260C-168 HR
Surface
250
Pb-Free
(RoHS)
Level-3-260C-168 HR
Mount Module
(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)
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
24-Aug-2014
(3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.
(4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.
(5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation
of the previous line and the two combined represent the entire Device Marking for that device.
(6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish
value exceeds the maximum column width.
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 2
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