XC9223D82DL [TOREX]
1A Driver Transistor Built-In Step-Down DC/DC Converters; 1A驱动三极管内置降压型DC / DC转换器型号: | XC9223D82DL |
厂家: | Torex Semiconductor |
描述: | 1A Driver Transistor Built-In Step-Down DC/DC Converters |
文件: | 总25页 (文件大小:380K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
XC9223/XC9224Series
ETR0509_007
1A Driver Transistor Built-In Step-Down DC/DC Converters
☆GreenOperation-Compatible
■GENERAL DESCRIPTION
The XC9223/XC9224 series are synchronous step-down DC/DC converters with a 0.21Ω (TYP.) P-channel driver transistor and a
synchronous 0.23Ω (TYP.) N-channel switching transistor built-in. A highly efficient and stable current can be supplied up to 1.0A by
reducing ON resistance of the built-in transistor. With a high switching frequency of 1.0MHz or 2.0MHz, a small inductor is selectable;
therefore, the XC9223/XC9224 series are ideally suited to applications with height limitation such as HDD or space-saving
applications. Current limit value can be chosen either 1.2A (MIN.) when the LIM pin is high level, or 0.6A (MIN.) when the LIM pin is
low level for using the power supply which current limit value differs such as USB or AC adapter. With the MODE/SYNC pin, the
XC9223/XC9224 series provide mode selection of the fixed PWM control or automatically switching current limit PFM/PWM control.
As for preventing unwanted switching noise, the XC9223/XC9224 series can be synchronized with an external clock signal within the
range of ± 25% toward an internal clock signal via the MODE/SYNC pin. For protection against heat damage of the ICs, the
XC9223/XC9224 series build in three protection functions: integral latch protection, thermal shutdown, and short-circuit protection.
With the built-in U.V.L.O. (Under Voltage Lock Out) function, the internal P-channel driver transistor is forced OFF when input voltage
becomes 1.8V or lower. The XC9223B/XC9224B series’ detector function monitors the discretional voltage by external resistors.
■APPLICATIONS
●HDD
■FEATURES
Input Voltage Range
: 2.5V ~ 6.0V
Output Voltage Range : 0.9V ~ VIN (set by FB pin)
Oscillation Frequency : 1MHz, 2MHz (+15% accuracy)
●Notebook computers
Output Current
Maximum Current
Limit
: 1.0A
●CD-R / RW, DVD
: 0.6A (MIN.) ~ 0.9A (MAX)
with LIM pin=’L’
: 1.2A (MIN.) ~ 2.0A (MAX.)
with LIM pin=’H’
: PWM/PFM or PWM by MODE pin
: Thermal shutdown
Integral latch method
●PDAs, Portable communication modems
●Digital cameras, Video recorders
●Various general-purpose power supplies
Controls
Protection Circuits
Short-circuit protection
: 1ms (TYP.) internally set
: B type (with VD function)
D type (without VD function)
: 0.21Ω
Soft-Start Time
Voltage Detector
Built-in P-channel
MOSFET
Built-in Synchronous
N-channel MOSFET
High Efficiency
: 0.23Ω
(No Schottky Barrier Diode Required)
: 95% (VIN=5.0V, VOUT=3.3V)
Synchronized with an External Clock Signal
Ceramic Capacitor Compatible
Packages
: MSOP-10, USP-10B, SOP-8
* SOP-8 package is available for the XC9223D type only.
■TYPICAL PERFORMANCE
CHARACTERISTICS
●Efficiency vs. Output Current
■TYPICAL APPLICATION CIRCUIT
XC9223B081Ax
L=4.7μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic)
VIN=5V, FOSC=1MHz,
100
90
80
70
60
50
40
30
20
10
0
VOUT=3.3V
VOUT=1.5V
(*1) A capacitor of 2200pF~0.1μF is recommended to place at the CDD between the AGND
pin and the VIN pin.
PWM/PFM
PWM
Please refer to the page showing INSTRUCTION ON PATTERN LAYOUT for more detail.
1
10
100
1000
Output Current: IOUT (mA)
1/25
XC9223/XC9224 Series
■PIN CONFIGURATION
1
2
3
VIN
AGND
FB
8 PGND
VIN 1
VDIN 2
AGND 3
VDOUT 4
FB 5
10 PGND
9 LX
LX
7
6
8 CE
7 MODE/SYNC
CE
6 LIM
5 MODE/SYNC
LIM 4
MSOP-10
(TOP VIEW)
SOP-8
(TOP VIEW)
LIM
5
4
3
6
7
8
FB
VDOUT
AGND
MODE/SYNC
CE
9
VDIN
VIN
2
1
LX
10 PGND
USP-10B
(BOTTOM VIEW)
■PIN ASSIGNMENT
PIN NUMBER
PIN NAME
FUNCTION
MSOP-10 * USP-10B *
SOP-8 **
1
2
1
2
1
-
VIN
VDIN
Input
Voltage Detector Input
Analog Ground
3
3
2
-
AGND
VDOUT
FB
4
4
VD Output
5
5
3
4
5
6
7
8
Output Voltage Monitor
Over Current Limit Setting
6
6
LIM
7
7
MODE/SYNC
CE
Mode Switch / External Clock Input
Chip Enable
8
8
9
9
Lx
Output of Internal Power Switch
Power Ground
10
10
PGND
* For MSOP-10 and USP-10B packages, please short the GND pins (pin #3 and 10)
** For SOP-8 package, please short the GND pins (pin# 2 and 8)
■FUNCTION CHART
1. CE Pin Function
CE PIN
OPERATIONAL STATE
H
L
ON
OFF *1
*1: Except for a voltage detector block in the XC9224 series.
2. MODE Pin Function
MODE PIN
FUNCTION
PWM Control
H
L
PWM/PFM Automatic Control
3. LIM Pin Function
LIM PIN
FUNCTION
H
L
Maximum Output Current: 1.0A
Maximum Output Current: 0.4A
2/25
XC9223/XC9224
Series
■PRODUCT CLASSIFICATION
●Selection Guide
●Ordering Information
XC9223①②③④⑤⑥ <The common CE pin in the DC/DC block and the voltage detector block.>
XC9224B②③④⑤⑥ <No CE pin in the voltage detector block. (Constant operating of the voltage detector block) >
DESIGNATOR
DESCRIPTION
SYMBOL
B
DESCRIPTION
: With VD function
Transistor built-in,
Output voltage freely set (FB voltage),
Current Limit: 0.6A/1.2A
①
D
: Without VD function
0
8
: Fixed reference voltage
②③
④
Reference Voltage
①=0, ②=8
1
: 1.0MHz
DC/DC Oscillation Frequency
2
: 2.0MHz
A
D
: MSOP-10
: USP-10B
⑤
⑥
Package
S
R
L
: SOP-8 (for the XC9223D type)
: Embossed tape, standard feed
: Embossed tape, reverse feed
Device Orientation
3/25
XC9223/XC9224 Series
■BLOCK DIAGRAM
●XC9223B/XC9224B Series
VIN
LIM
Current Limit
PFM
Error Amp.
Comparator
PWM
FB
Buffer
Driver
Logic
Current
Feedback
LX
Vref with
Soft-Start,
CE
CE
PGND
AGND
Ramp Wave
Generator,
OSC
Thermal
Shutdown
MODE/
SYNC
PMW/PFM
VD
VDOUT
VDIN
●XC9223D Series
VIN
LIM
Current Limit
PFM
Error Amp.
Comparator
PWM
FB
Buffer
Driver
Logic
Current
Feedback
LX
Vref with
Soft-Start,
CE
CE
PGND
AGND
Ramp Wave
Generator,
OSC
Thermal
Shutdown
MODE/
SYNC
PMW/PFM
4/25
XC9223/XC9224
Series
■ABSOLUTE MAXIMUM RATINGS
Ta=25OC
PARAMETER
VIN Pin Voltage
SYMBOL
VIN
RATINGS
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ 6.5
10
UNITS
V
V
VDIN Pin Voltage
VDOUT Pin Voltage
VDOUT Pin Current
FB Pin Voltage
VDIN
VDOUT
IDOUT
VFB
V
mA
V
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ 6.5
- 0.3 ~ VDD + 0.3
2000
LIM Pin Voltage
MODE/SYNC Pin Voltage
CE Pin Voltage
VLIM
V
VMODE/SYNC
VCE
V
V
Lx Pin Voltage
VLx
V
Lx Pin Current
ILx
mA
MSOP-10
350 (*1)
Power Dissipation
Pd
mW
USP-10B
SOP-8
150
300
Operating Temperature Range
Topr
Tstg
- 40 ~ + 85
- 55 ~ +125
℃
℃
Storage Temperature Range
*1: When implemented on a PCB.
5/25
XC9223/XC9224 Series
■ELECTRICAL CHARACTERISTICS
XC9223/XC9224 Series
Topr=25℃
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNIT CIRCUIT
Input Voltage
FB Voltage
VIN
VFB
2.5
0.784
0.9
-
0.800
-
6.0
0.816
VIN
V
V
V
-
①
③
Output Voltage Setting Range
VOUTSET
Maximum Output Current 1 (*1)
Maximum Output Current 2 (*1)
IOUTMAX1
IOUTMAX2
0.4
1.0
-
-
-
-
A
A
③
③
FB=VFB x 0.9, VIN Voltage which Lx pin
voltage holding ‘L’ level (*8)
U.V.L.O. Voltage
Supply Current 1
Supply Current 2
Stand-by Current
Oscillation Frequency
VUVLO
IDD1
1.55
1.80
2.00
V
①
②
②
②
③
FB=VFB x 0.9, MODE/SYNC=0V
D1-1 (*2)
D1-2 (*2)
D1-6 (*2)
D1-3 (*2)
μA
μA
μA
MHz
FB=VFB x 1.1 (Oscillation stops),
MODE/SYNC=0V
IDD2
ISTB
CE=0V
Connected to external components,
IOUT=10mA
FOSC
Connected to external components,
IOUT=10mA, apply an external clock signal
to the MODE/SYNC
External Clock Signal
Synchronized Frequency
SYNCOSC
D1-4 (*2)
MHz
④
External Clock Signal Cycle
Maximum Duty Cycle
Minimum Duty Cycle
SYNCDTY
MAXDTY
MINDTY
25
100
-
-
-
-
75
-
%
%
%
④
①
①
FB=VFB x 0.9
FB=VFB x 1.1
0
Connected to external components,
MODE/SYNC=0V, IOUT=10mA
PFM Switch Current
IPFM
-
200
250
mA
③
Connected to external components,
VIN=5.0V, VOUT=3.3V, IOUT=200mA
Efficiency (*3)
EFFI
RLxH
-
-
95
-
%
③
①
Lx SW ‘H’ On Resistance (*4)
FB=VFB x 0.9, ILx=VIN-0.05V
0.21
0.3 (*7)
Ω
Lx SW ‘L’ On Resistance
Current Limit 1
RLxL
ILIM1
ILIM2
-
0.23
0.3 (*7)
0.9
Ω
A
A
-
LIM=0V
LIM=VIN
0.6
1.2
-
-
①
①
Current Limit 2
2.0
Integral Latch Time (*5)
Short Detect Voltage
Soft-Start Time
TLAT
VSHORT
TSS
FB=VFB x 0.9, Short Lx by 1Ω resistance
FB Voltage which Lx becomes ‘L’ (*8)
CE=0V→VIN, IOUT=1mA
D1-5 (*2)
0.4
ms
V
①
①
①
-
0.3
0.5
-
0.5
2.0
-
1.0
ms
OC
OC
Thermal Shutdown Temperature
Hysteresis Width
TTSD
150
THYS
-
20
-
-
FB=VFB x 0.9, Voltage which Lx becomes
‘H’ after CE voltage changed from 0.4V to
1.2V (*8)
FB=VFB x 0.9, Voltage which Lx becomes
‘L’ after CE voltage changed from 1.2V to
0.4V (*8)
CE ‘H’ Voltage
CE ‘L’ Voltage
VCEH
VCEL
1.2
-
-
-
-
V
V
①
①
0.4
MODE/SYNC ‘H’ Voltage
MODE/SYNC ‘L’ Voltage
LIM ‘H’ Voltage
VMODE/SYNCH
VMODE/SYNCL
VLIMH
1.2
-
-
-
-
-
0.4
-
V
V
V
③
③
①
1.2
IOUT=ILIM1 x 1.1, Check LIM voltage which
Lx oscillated after CE voltage changed
from 1.2V to 0.4V
LIM ‘L’ Voltage
VLIML
-
-
0.4
V
①
CE ‘H’ Current
CE ‘L’ Current
ICEH
ICEL
VIN=CE=6.0V
-
- 0.1
-
-
-
-
-
-
-
-
-
-
-
0.1
-
A
⑤
⑤
⑤
⑤
⑤
⑤
⑤
⑤
⑥
⑥
VIN=6.0V, CE=0V
VIN=6.0V
μA
μA
μA
μA
μA
μA
μA
μA
μA
MODE/SYNC ‘H’ Current
MODE/SYNC ‘L’ Current
LIM ‘H’ Current
IMODE/SYNCH
IMODE/SYNCL
ILIMH
0.1
-
VIN=6.0V, MODE/SYNC=0V
VIN=LIM=6.0V
- 0.1
-
0.1
-
LIM ‘L’ Current
ILIML
VIN=6.0V, LIM=0V
VIN=FB=6.0V
- 0.1
-
FB ‘H’ Current
IFBH
0.1
-
FB ‘L’ Current
IFBL
VIN=6.0V, FB=0V
VIN=Lx=6.0V, CE=0V
VIN=6.0V, Lx=CE=0V
- 0.1
-
Lx SW ‘H’ Leak Current
Lx SW ‘L’ Leak Current (*6)
ILeakH
1.0
-
ILeakL
- 3.0
6/25
XC9223/XC9224
Series
■ELECTRICAL CHARACTERISTICS (Continued)
XC9223/XC9224 Series (Continued), Voltage Detector Block (*9)
Topr=25℃
PARAMETER
Detect Voltage
Release Voltage
SYMBOL
VDF
CONDITIONS
MIN.
0.676
0.716
TYP.
0.712
0.752
MAX.
0.744
0.784
UNIT CIRCUIT
VDIN Voltage which VDOUT becomes
‘H’ to ‘L’, Pull-up resistor 200kΩ
VDIN Voltage which VDOUT becomes
‘L’ to ‘H’, Pull-up resistor 200kΩ
V
V
⑦
⑦
VDR
Hysteresis Width
Output Current
VHYS
IDOUT
VHYS=(VDR-VDF) / VDF x 100
-
5
-
-
%
-
VDIN=VDF x 0.9, apply 0.25V to VDOUT
2.5
4.0
mA
⑦
Time until VDOUT becomes ‘L’ to ‘H’ after
VDIN changed from 0V to 1.0V
Delay Time
TDLY
0.5
2.0
8.0
ms
⑦
VDIN ‘H’ Current
VDIN ‘L’ Current
VDOUT ‘H’ Current
VDOUT ‘L’ Current
IVDINH
IVDINL
VIN=VDIN=6.0V
-
-
-
-
-
0.1
-
μA
μA
μA
μA
⑤
⑤
⑤
⑤
VIN=6.0V, VDIN=0V
- 0.1
-
IVDOUTH
IVDOUTL
VIN=VDIN=VDOUT=6.0V
VIN=VDIN=6.0V, VDOUT=0V
1.0
-
- 1.0
Test Condition: Unless otherwise stated, VIN=3.6V, CE=VIN, MODE/SYNC=VIN
NOTE:
*1: When the difference between the input and the output is small, some cycles may be skipped completely before current maximizes.
If current is further pulled from this state, output voltage will decrease because of P-ch driver ON resistance.
*2: Refer to the chart below.
*3: EFFI = { ( output voltage x output current ) / ( input voltage x input current) } x 100
*4: On resistance (Ω)= (VIN- Lx pin measurement voltage) / 100mA
*5: Time until it short-circuits Lx with GND through 1Ω of resistance from a state of operation and is set to Lx=Low from current limit pulse
generating.
*6: When temperature is high, a current of approximately 100μA may leak.
*7: Designed value.
*8: Whether the Lx pin is high level or low level is judged at the condition of “H”>VIN-0.1V and “L”<0.05V.
*9: There is no voltage detector function available in the XC9223D series.
●Electrical Characteristics Standard Values
1MHz
TYP.
380
2MHz
TYP.
440
45
No.
PARAMETER
SYMBOL
MIN.
MAX.
700
60
MIN.
MAX.
800
80
D1-1
D1-2
D1-3
Supply Current 1
Supply Current 2
IDD1
IDD2
-
-
-
-
30
Oscillation Frequency
External Clock
FOSC
0.85
1.00
1.15
1.7
2.0
2.3
D1-4
D1-5
SYNCOSC
TLAT
0.75
-
-
1.25
15.0
1.5
-
-
2.5
Synchronous Oscillation
Integral Latch Time
6.0
3.0
15.0
XC9223 SERIES
XC9224 SERIES
No.
PARAMETER
SYMBOL
ISTB
MIN.
-
TYP.
0.1
MAX.
2.0
MIN.
-
TYP.
7.0
MAX.
D1-6
Stand-by Current
15.0
7/25
XC9223/XC9224 Series
■TYPICAL APPLICATION CIRCUIT
(*1) A capacitor of 2200pF~0.1μF is recommended to place at the CDD between the AGND pin and the VIN pin.
Please refer to the page showing INSTRUCTION ON PATTERN LAYOUT for more detail.
<Output Voltage Setting>
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation,
based on the values of RFB1 and RFB2. The sum of RFB1 and RFB2 should normally be 1MΩ or less.
VOUT = 0.8 x (RFB1 + RFB2) / RFB2
The value of CFB, speed-up capacitor for phase compensation, should be fzfb = 1 / (2 x π x CFB1 x RFB1) which is equal to
20kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and value of
load capacity (CL).
[Example of calculation]
When RFB1=470kΩ, RFB2=150kΩ,
VOUT1 = 0.8 x (470k + 150k) / 150k =3.3V
[Typical example]
VOUT (V)
1.0
CFB (pF)
110
51
VOUT (V)
2.5
CFB (pF)
15
RFB1 (kΩ)
75
RFB2 (kΩ)
300
RFB1 (kΩ)
510
RFB2 (kΩ)
240
1.2
150
300
3.0
330
120
24
1.5
130
150
62
3.3
470
150
18
1.8
300
240
27
5.0
430
82
18
* When fzfb = 20kHz
[External components]
1MHz:
L: 4.7μH (CDRH4D28C, SUMIDA)
CL: 10μF (ceramic)
CIN: 10μF (ceramic)
2MHz:
L: 2.2μH (CDRH4D28, SUMIDA)
2.2μH (VLCF4020T-2R2N1R7, TDK)
CL: 10μF (ceramic)
CIN: 10μF (ceramic)
* As for CIN and CL, use output capacitors of 10μF or more. (Ceramic capacitor compatible)
* High ESR (Equivalent Series Resistance) that comes by using a tantalum or an electrolytic capacitor causes high ripple voltage.
Furthermore, it can cause an unstable operation. Use the IC after you fully confirm with an actual device.
8/25
XC9223/XC9224
Series
■OPERATIONAL EXPLANATION
Each unit of the XC9223/XC9224 series consists of a reference voltage source, a ramp wave circuit, error amplifier, PWM
comparator, phase compensation circuit, output voltage adjustment resistors, P-channel MOS driver transistor, N-channel
MOS synchronous rectification switching transistor, current limiter circuit, U.V.L.O. circuit and others. The series
compares, using the error amplifier, the internal reference voltage to the VOUT pin with the voltage feedback via resistors
RFB1 and RFB2. Phase compensation is performed on the resulting error amplifier output, to input a signal to the PWM
comparator to determine the turn-on time during PWM operation. The PWM comparator compares, in terms of voltage
level, the signal from the error amplifier with the ramp wave from the ramp wave circuit, and delivers the resulting output to
the buffer driver circuit to cause the Lx pin to output a switching duty cycle. This process is continuously performed to
ensure stable output voltage. The current feedback circuit monitors the P-channel MOS driver transistor current for each
switching operation, and modulates the error amplifier output signal to provide multiple feedback signals. This enables a
stable feedback loop even when a low ESR capacitor, such as a ceramic capacitor, is used, ensuring stable output voltage.
<Reference Voltage Source>
The reference voltage source provides the reference voltage to ensure stable output voltage of the DC/DC converter.
<Ramp Wave Circuit>
The ramp wave circuit determines switching frequency. The frequency is fixed internally and can be selected from 1.0MHz
and 2.0MHz. Clock pulses generated in this circuit are used to produce ramp waveforms needed for PWM operation, and
to synchronize all the internal circuits.
<Error Amplifier>
The error amplifier is designed to monitor output voltage. The amplifier compares the reference voltage with the feedback
voltage divided by the internal resistors (RFB1 and RFB2). When a voltage lower than the reference voltage is fed back, the
output voltage of the error amplifier increases. The gain and frequency characteristics of the error amplifier output are
fixed internally to deliver an optimized signal to the mixer.
<Current Limit>
The current limiter circuit of the XC9223/XC9224 series monitors the current flowing through the P-channel MOS driver
transistor connected to the Lx pin, and features a combination of the constant-current type current limit mode and the
operation suspension mode. For the current limit values, please select the values either from 1.2A (MIN.) when the LIM
pin is high level or 0.6A (MIN.) when the LIM pin is low level.
1When the driver current is greater than a specific level, the constant-current type current limit function operates to turn
off the pulses from the Lx pin at any given time.
2When the driver transistor is turned off, the limiter circuit is then released from the current limit detection state.
3At the next pulse, the driver transistor is turned on. However, the transistor is immediately turned off in the case of an
over current state.
4 When the over current state is eliminated, the IC resumes its normal operation.
The IC waits for the over current state to end by repeating the steps 1 through 3. If an over current state continues for
several msec and the above three steps are repeatedly performed, the IC performs the function of latching the OFF state of
the driver transistor, and goes into operation suspension mode. After being put into suspension mode, the IC can resume
operation by turning itself off once and then starting it up using the CE pin, or by restoring power to the VIN pin. Integral
latch time may be released from a current limit detection state because of the noise. Depending on the state of a substrate,
it may result in the case where the latch time may become longer or the operation may not be latched. Please locate an
input capacitor as close as possible.
ms
Limit < #
ms
Limit > #
Current Limit LEVEL
IOUT
VOUT
LX
0mA
VSS
CE
Restart
VIN
9/25
XC9223/XC9224 Series
■OPERATIONAL EXPLANATION (Continued)
<Thermal Shutdown>
For protection against heat damage of the ICs, thermal shutdown function monitors chip temperature. The thermal
shutdown circuit starts operating and the driver transistor will be turned off when the chip’s temperature reaches 150OC.
When the temperature drops to 130OC or less after shutting of the current flow, the IC performs the soft start function to
initiate output startup operation.
<Short-Circuit Protection>
The short-circuit protection circuit monitors FB voltage. In case where output is accidentally shorted to the Ground and
when the FB voltage decreases less than half of the FB voltage, the short-circuit protection operates to turn off and to
latch the driver transistor. In latch mode, the operation can be resumed by either turning the IC off and on via the CE pin,
or by restoring power supply to the VIN pin.
<Voltage Detector>
The detector block of the XC9223/9224 series detects a signal inputted from the VDIN pin by the VDOUT pin (N-ch
open-drain).
<U.V.L.O. Circuit>
When the VIN pin voltage becomes 1.8V (TYP.) or lower, the driver transistor is forced OFF to prevent false pulse output
caused by unstable operation of the internal circuitry. When the VIN pin voltage becomes 2.0V (TYP.) or higher, switching
operation takes place. By releasing the U.V.L.O. function, the IC performs the soft-start function to initiate output startup
operation. The U.V.L.O. function operates even when the VIN pin voltage falls below the U.V.L.O. operating voltage for
tens of ns.
<MODE/SYNC>
A MODE/SYNC pin has two functions, a MODE switch and an input of external clock signal. The MODE/SYNC pin
operates as the PWM mode when applying high level of direct current and the PFM/PWM automatic switching mode by
applying low level of direct current, which is the same function as the normal MODE pin. By applying the external clock
signal (±25% of the internal clock signal, ON duty 25% to 75%), the MODE/SYNC pin switches to the internal clock signal.
Also the circuit will synchronize with the falling edge of external clock signal. While synchronizing with the external clock
signal, the MODE/SYNC pin becomes the PWM mode automatically. If the MODE/SYNC pin holds high or low level of the
external clock signal for several μs, the MODE/SYNC pin stops synchronizing with the external clock and switches to the
internal clock operation. (Refer to the chart below.)
・External Clock Synchronization Function
VOUT
50mV/div
Synchronous with the
Operates by the
external clock
internal clock
1.2MHz
1MHz
Lx
2V/div
External Clock Signal
1.2MHz Duty50%
MODE/SYNC
2V/div
Delay time to the external clock synchronization
1.0ꢀs/div
* When an input of MODE/SYNC is changed from “L” voltage into a clock signal of 1.2MHz and 50% duty.
10/25
XC9223/XC9224
Series
■OPERATIONAL EXPLANATION (Continued)
<PFM Switch Current>
In PFM control operation, until coil current reaches to a specified level (IPFM), the IC keeps the P-ch MOSFET on. In this case,
time that the P-ch MOSFET is kept on (TON) can be given by the following formula.
TON= L×IPFM (VIN-VOUT)
→IPFM①
<Maximum IPFM Limit>
In PFM control operation, the maximum duty cycle (MAXPFM) is set to 50% (TYP.). Therefore, under the condition that the
duty increases (e.g. the condition that the step-down ratio is small), it’s possible for P-ch MOSFET to be turned off even when
coil current doesn’t reach to IPFM.
→IPFM②
IPFM②
IPFM①
Ton
FOSC
Maxumum IPFMCurrent
Lx
Lx
IPFM
0mA
IPFM
0mA
I Lx
I Lx
11/25
XC9223/XC9224 Series
■NOTES ON USE
1. The XC9223/XC9224 series is designed for use with ceramic output capacitors. If, however, the potential difference
between dropout voltage, a ceramic capacitor may fail to absorb the resulting high switching energy and oscillation could
occur on the output. In this case, use a larger capacitor etc. to compensate for insufficient capacitance.
2. Spike noise and ripple voltage arise in a switching regulator as with a DC/DC converter. These are greatly influenced by
external component selection, such as the coil inductance, capacitance values, and board layout of external components.
Once the design has been completed, verification with actual components should be done.
3. In PWM control, very narrow pulses will be outputted, and there is the possibility that some cycles may be skipped
completely. This may happens while synchronizing with an external clock.
4. When the difference between VIN and VOUT is small, and the load current is heavy, very wide pulses will be outputted and
there is the possibility that some cycles may be skipped completely.
5. With the IC, the peak current of the coil is controlled by the current limit circuit. Since the peak current increases when
dropout voltage or load current is high, current limit starts operating, and this can lead to instability. When peak current
becomes high, please adjust the coil inductance value and fully check the circuit operation. In addition, please calculate
the peak current according to the following formula:
Ipk = (VIN - VOUT) x OnDuty / (2 x L x FOSC) + IDOUT
L: Coil Inductance Value
FOSC: Oscillation Frequency
6. When the peak current, which exceeds limit current, flows within the specified time, the built-in P-ch driver transistor is
turned off (an integral latch circuit). During the time until it detects limit current and before the built-in transistor can be
turned off, the current for limit current flows; therefore, care must be taken when selecting the rating for the coil.
7. The voltage drops because of ON resistance of a driver transistor or in-series resistance of a coil. For this, the current
limit may not be attained to the limit current value, when input voltage is low.
8. Malfunction may occur in the U.V.L.O. circuit because of the noise when pulling current at the minimum operation voltage.
9. This IC and the external components should be used within the stated absolute maximum ratings in order to prevent
damage to the device.
10. Depending on the state of the PC Board, latch time may become longer and latch operation may not work. The board
should be laid out so that capacitors are placed as close to the chip as possible.
11. In heavy load, the noise of DC/DC may influence and the delay time of the voltage detector may be prolonged.
12. Output voltage may become unstable when synchronizing high internal frequency with the external clock.
In such a case, please use a larger output capacitor etc. to compensate for insufficient capacitance.
13. When a voltage lower than minimum operating voltage is applied, the output voltage may fall before reaching the over
current limit.
14. When the IC is used in high temperature, output voltage may increase up to input voltage level at light load (less than 100
μA) because of the leak current of the driver transistor.
15. The current limit is set to LIM=H: 2000mA (MAX.). However, the current of 2000mA or more may flow. In case that the
current limit functions while the VOUT pin is shorted to the GND pin, when P-ch MOSFET is ON, the potential difference
for input voltage will occur at both ends of a coil. For this, the time rate of coil current becomes large. By contrast,
when N-ch MOSFET is ON, there is almost no potential difference at both ends of the coil since the VOUT pin is shorted to
the GND pin. Consequently, the time rate of coil current becomes quite small. According to the repetition of this
operation, and the delay time of the circuit, coil current will be converged on a certain current value, exceeding the
amount of current, which is supposed to be limited originally. The short protection does not operate during the soft-start
time. The short protection starts to operate and the circuit will be disabled after the soft-start time. Current larger than
over current limit may flow because of a delay time of the IC when step-down ratio is large. A coil should be used within
the stated absolute maximum rating in order to prevent damage to the device.
①Current flows into P-ch MOSFET to reach the current limit (ILIM).
②The current of ILIM (2000mA, MAX.) or more flows since the delay time of the circuit occurs during from the detection of
the current limit to OFF of P-ch MOSFET.
③Because of no potential difference at both ends of the coil, the time rate of coil current becomes quite small.
④Lx oscillates very narrow pulses by the current limit for several msec.
⑤The short protection operates, stopping its operation.
②
③
①
④ #ms
⑤
Delay
VLX
Overcurrent
Limit Value
ILX
(Coil Current)
12/25
XC9223/XC9224
Series
■INSTRUCTION ON PATTERN LAYOUT
1. In order to stabilize VIN’s voltage level, we recommend that a by-pass capacitor (CIN) be connected as close as
possible to the VIN & VSS pins.
2. Please mount each external component, especially CIN, as close to the IC as possible.
3. Wire external components as close to the IC as possible and use thick, short connecting traces to reduce the circuit
impedance.
4. Make sure that the PCB GND traces are as thick as possible, as variations in ground potential caused by high
ground currents at the time of switching may result in instability of the IC.
5. Unstable operation may occur at the heavy load because of a spike noise. 2200pF ~0.1μF of a capacitor, CDD, is
recommended to use between the AGND pin and the VIN pin for reducing noise.
・TOP VIEW
Inductor
L
0
R
C
Jumper Chip
Resistor
・BOTTOM VIEW
Ceramic Capaticor
13/25
XC9223/XC9224 Series
■TEST CIRCUITS
Circuit ②
Circuit ①
Waveform Measurement Point
A
VIN
CE
LX
FB
ILx
LX
A
VIN
CE
MODE/
SYNC
ILIM
1uF
MODE/
SYNC
ILIM
FB
1uF
V
VDIN
VDOUT
AGND
VDIN
VDOUT
AGND
PGND
PGND
Circuit ③
Waveform Measurement Point
L
IOUT
LX
VIN
CE
A
A
RFB1
RFB2
V
CFB
CL
V
MODE/
SYNC
ILIM
FB
CIN
VDOUT
AGND
VDIN
V
PGND
* External Components
L (1MHz) : 4.7ꢀH (CDRH4D28C, SUMIDA)
L (2MHz) : 2.2ꢀH (VLCF4020T-2R2N1R7, TDK)
ꢁꢁCIN : 10ꢀF (ceramic)
ꢁꢁCL : 10ꢀF (ceramic)
ꢁꢁRFB1 : 130kΩ
ꢁꢁRFB2 : 150kΩ
ꢁꢁCFB : 62pF (ceramic)
Circuit ④
Waveform Measurement Point
L
IOUT
VIN
CE
LX
RFB1
RFB2
CFB
MODE/
SYNC
ILIM
FB
CL
~
CIN
VDIN
VDOUT
AGND
PULSE
PGND
* External Components
L (1MHz) : 4.7ꢀH (CDRH4D28C, SUMIDA)
L (2MHz) : 2.2ꢀH (VLCF4020T-2R2N1R7, TDK)
ꢁꢁCIN : 10ꢀF (ceramic)
ꢁꢁCL : 10ꢀF (ceramic)
ꢁꢁRFB1 : 130kΩ
ꢁꢁRFB2 : 150kΩ
ꢁꢁCFB : 62pF (ceramic)
14/25
XC9223/XC9224
Series
■TEST CIRCUITS (Continued)
Circuit ⑤
LX
FB
VIN
CE
A
A
MODE/
SYNC
ILIM
A
A
A
1ꢀF
A
A
VDOUT
AGND
VDIN
PGND
Circuit ⑥
LX
FB
VIN
CE
A
MODE/
SYNC
ILIM
1ꢀF
VDOUT
VDIN
AGND
PGND
Circuit ⑦
LX
FB
VIN
CE
MODE/
SYNC
1ꢀF
200kΩ
ILIM
A
VDIN
VDOUT
PGND
AGND
Waveform Measurement Point
15/25
XC9223/XC9224 Series
■TYPICAL PERFORMANCE CHARACTERISTICS
(1) Efficiency vs. Output Current
XC9223B082Ax
XC9223B081Ax
VIN=5V, FOSC=2MHz, L=2.2μH (CDRH4D28),
V
=5V, F =1MHz, L=4.7μH (CDRH4D28C),
IN
OSC
C
=10μF (ceramic), CL=10μF (ceramic)
CIN=10μF (ceramic), CL=10μF (ceramic)
IN
100
90
80
70
60
50
40
30
20
10
0
100
90
80
70
60
50
40
30
20
10
0
VOUT=3.3V
VOUT=1.5V
VOUT=3.3V
VOUT=1.5V
PWM/PFM
PWM
PWM/PFM
PWM
1
10
100
1000
1
10
100
1000
Output Current: IOUT (mA)
Output Current: IOUT (mA)
XC9223B081Ax
XC9223B082Ax
VIN=3.3V, FOSC=2MHz, L=2.2μH (CDRH4D28),
VIN=3.3V, FOSC=1MHz, L=4.7μH (CDRH4D28C),
CIN=10μF (ceramic), CL=10μF (ceramic)
CIN=10μF (ceramic), CL=10μF (ceramic)
100
100
90
80
70
60
90
80
70
60
VOUT=2.5V
VOUT=1.5V
VOUT=2.5V
VOUT=1.5V
50
40
30
20
10
0
50
40
30
20
10
0
PWM/PFM
PWM
PWM/PFM
PWM
1
10
100
1000
1
10
100
1000
OutputCurrent:IOUT(mA)
Output Current: IOUT (mA)
(2) Output Voltage vs. Output Current
XC9223B081Ax
XC9223B082Ax
VIN=5.0V, Topr=25℃, L=4.7μH (CDRH4D28C),
VIN=5.0V, Topr=25℃, L=4.7μH (CDRH4D28C),
CIN=10μF (ceramic), CL=10μF (ceramic)
CIN=10μF (ceramic), CL=10μF (ceramic)
1.6
1.55
1.5
3.6
3.5
3.4
3.3
3.2
3.1
3
PWM Control
PWM Control
1.45
1.4
PWM/PFM Automatic Switching Control
PWM/PFM Automatic Switching Control
1
10
100
1000
1
10
100
1000
Output Current: IOUT (mA)
Output Current: IOUT (mA)
16/25
XC9223/XC9224
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(2) Output Voltage vs. Output Current (Continued)
XC9223B082Ax
XC9223B081Ax
o
VIN=3.3V, Topr=25℃, L=4.7μH (CDRH4D28C),
VIN=3.3V, Topr=25℃, L=4.7μH (CDRH4D28C),
CIN=10μF (ceramic), CL=10μF (ceramic)
CIN=10μF (ceramic), CL=10μF (ceramic)
2.8
2.7
2.6
2.5
2.4
2.3
2.2
1.6
1.55
1.5
PWM Control
PWM Control
PWM/PFM Automatic Switching Control
1.45
1.4
PWM/PFM Automatic Switching Control
1
10
100
1000
1
10
100
1000
Output Current: IOUT (mA)
Output Current: IOUT (mA)
(3) Oscillation Frequency vs. Ambient Temperature
(4) U.V.L.O. Voltage vs. Ambient Temperature
XC9223/XC9224 Series
XC9223/XC9224 Series
1.40
2.8
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
UVLO2
1MHz
1.20
2.4
2
1.00
2MHz
0.80
1.6
UVLO
-25
0.60
1.2
-50
-25
0
25
50
75
100
-50
0
25
50
75
100
Ambient Temperature : Ta (oC)
Ambient Temperature : Ta (oC)
(5) Supply Current 2 vs. Input Voltage
XC9223/XC9224 Series (2MHz)
XC9223/XC9224 Series (1MHz)
CE=FB=VIN, MODE=0V
CE=FB=VIN, MODE=0V
100
80
60
40
20
0
100
80
60
40
20
0
2
3
4
5
6
7
2
3
4
5
6
7
Input Voltage: VIN (V)
Input Voltage: VIN (V)
17/25
XC9223/XC9224 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(6) Soft Start Time
XC9223/XC9224 Series
XC9223/XC9224 Series
VIN=5.0V,VOUT=3.3V,CE=0 5V
→
VIN=5.0V,VOUT=1.5V,CE=0 5V
→
IOUT=1mA,MODE=VIN
IOUT=1mA,MODE=0V
CE : 5V/div
CE : 5V/div
VOUT : 1V/div
VOUT : 1V/div
500μs / div
500μs / div
(7) FB Voltage vs. Supply Voltage
XC9223/XC9224 Series
IOUT=0.1mA,Topr=25oC
0.816
0.808
0.800
0.792
0.784
2.0
3.0
4.0
5.0
6.0
7.0
Input Voltage: VIN (V)
18/25
XC9223/XC9224
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(8) Load Transient Response
XC9223B081Ax <1MHz>
VIN=5.0V, VOUT=3.3V, MODE/SYNC=VIN (PWM control)
L=4.7μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
500μs / div
50μs / div
VOUT:200mV/div
VOUT:200mV/div
IOUT=800mA
IOUT=800mA
IOUT=200mA
IOUT=200mA
50μs / div
500μs / div
VIN=5.0V, VOUT=3.3V, MODE/SYNC=0V (PWM/PFM automatic switching control)
L=4.7μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
50μs / div
500μs / div
19/25
XC9223/XC9224 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(8) Load Transient Response (Continued)
XC9223B081Ax <1MHz> (Continued)
VIN=5.0V, VOUT=1.5V, MODE/SYNC=VIN (PWM control)
L=4.7μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
200μs / div
50μs / div
VOUT:200mV/div
VOUT:200mV/div
IOUT=800mA
IOUT=800mA
IOUT=200mA
IOUT=200mA
50μs / div
200μs / div
VIN=5.0V, VOUT=1.5V, MODE/SYNC=0V (PWM/PFM automatic switching control)
L=4.7μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
50μs / div
200μs / div
20/25
XC9223/XC9224
Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(8) Load Transient Response (Continued)
XC9223B082Ax <2MHz>
VIN=5.0V, VOUT=3.3V, MODE/SYNC=VIN (PWM control)
L=2.2μH (CDRH4D28), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
50μs / div
500μs / div
VOUT:200mV/div
VOUT:200mV/div
IOUT=800mA
IOUT=800mA
IOUT=200mA
IOUT=200mA
50μs / div
500μs / div
VIN=5.0V, VOUT=3.3V, MODE/SYNC=0V (PWM/PFM automatic switching control)
L=2.2μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
50μs / div
500μs / div
21/25
XC9223/XC9224 Series
■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
(8) Load Transient Response (Continued)
XC9223B082Ax <2MHz> (Continued)
VIN=5.0V, VOUT=1.5V, MODE/SYNC=VIN (PWM control)
L=2.2μH (CDRH4D28), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
50μs / div
200μs / div
VOUT:200mV/div
VOUT:200mV/div
IOUT=800mA
IOUT=800mA
IOUT=200mA
IOUT=200mA
50μs / div
200μs / div
VIN=5.0V, VOUT=1.5V, MODE/SYNC=0V (PWM/PFM automatic switching control)
L=2.2μH (CDRH4D28C), CIN=10μF (ceramic), CL=10μF (ceramic), Topr=25OC
VOUT:200mV/div
VOUT:200mV/div
IOUT=200mA
IOUT=200mA
IOUT=1mA
IOUT=1mA
200μs / div
50μs / div
22/25
XC9223/XC9224
Series
■PACKAGE INFORMATION
●USP-10B
●MSOP-10
1
0.15+0.08
2.9+0.15
ꢆꢆꢆ
ꢆꢆꢆꢆ
1
3.00+0.10
0.2+0.05
0.45+0.05
0.45+0.05
0.2+0.05
0.2+0.05
0.125
0.15
0.2
0.325 0.3 0.3
+0.1
-0.05
(0.5)
1 0.20
0.65
0.65
2.5+0.1
0.5
0.5
0.1+0.03
0.1+0.03
●SOP-8
+ꢃꢂꢃꢅ
-ꢃꢂꢅ
ꢃꢂꢄ
+ꢃꢂ5ꢃ
-ꢃꢂꢄꢃ
5ꢂꢃ
ꢅꢂꢄ7±ꢃꢂꢃ3
ꢃꢂ4±ꢃꢂꢅ
23/25
XC9223/XC9224 Series
■PACKAGING INFORMATION (Continued)
●USP-10B Recommended Pattern Layout
●USP-10B Recommended Metal Mask Design
1.50
1.05
0.80
1.50
1.45
1.10
0.70
1.45
1.10
0.70
0.35
0.35
0.45
0.45
1.05
0.80
0.20 0.20
0.15
0.15
0.20
0.40
0.20
■MARKING RULE
●MSOP-10
①Represents products series
10 9
8
7
6
MARK
0
PRODUCT SERIES
XC9223xxxxAx
A
XC9224xxxxAx
②Represents type of DC/DC converters
① ② ③
④ ⑤ ⑥ ⑦
MARK
B
PRODUCT SERIES
XC9223/9224BxxxAx
③④Represents reference voltage
MARK
PRODUCT SERIES
XC9223/9224x08xAx
③
④
1
2
3
4
5
0
8
MSOP-10
(TOP VIEW)
⑤Represents oscillation frequency
MARK
OSCILLATION FREQUENCY
PRODUCT SERIES
1
2
1.0MHz
2.0MHz
XC9223/9224xxx1Ax
XC9223/9224xxx2Ax
⑥Represents production lot number
01 to 09, 0A to 0Z, 10 to 19, 1A~ in order. (G, I, J, O, Q, W excepted)
Note: No character inversion used.
ex.)
MARKING
PRODUCTION
LOT NUMBER
⑥
0
⑦
3
03
1
A
1A
24/25
XC9223/XC9224
Series
1. The products and product specifications contained herein are subject to change without
notice to improve performance characteristics. Consult us, or our representatives
before use, to confirm that the information in this catalog is up to date.
2. We assume no responsibility for any infringement of patents, patent rights, or other
rights arising from the use of any information and circuitry in this catalog.
3. Please ensure suitable shipping controls (including fail-safe designs and aging
protection) are in force for equipment employing products listed in this catalog.
4. The products in this catalog are not developed, designed, or approved for use with such
equipment whose failure of malfunction can be reasonably expected to directly
endanger the life of, or cause significant injury to, the user.
(e.g. Atomic energy; aerospace; transport; combustion and associated safety
equipment thereof.)
5. Please use the products listed in this catalog within the specified ranges.
Should you wish to use the products under conditions exceeding the specifications,
please consult us or our representatives.
6. We assume no responsibility for damage or loss due to abnormal use.
7. All rights reserved. No part of this catalog may be copied or reproduced without the
prior permission of Torex Semiconductor Ltd.
25/25
相关型号:
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