TOREX XC9503 User Manual

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XC9503 Series

ETR0703_003

2ch.Step-Down DC/DC Controller ICs

GENERAL DESCRIPTION

XC9503 series are PWM controlled, PWM/PFM automatic switching controlled, multi-functiona l, 2 channel step-down DC/DC
controller ICs. Since the series has a built-in 0.9V reference voltage (accuracy ±2%), 0.9V to 6.0V can be set using external
components.
With a 300kHz frequency, the size of the external components can be reduced. Switching frequencies of 180kHz & 500kHz
are also available as custom-designed products.
The control of the XC9503 series can be switched bet ween PWM control and PWM/PFM automatic switching control usi ng
external signals. Control switches from PWM to PFM during light loads when automatic switching is selected and the series is
highly efficient from light loads through to large output currents. Noise is easily reduced with PWM control since the frequency
is fixed. The series gives freedom to select control suited to the application.
Soft-start time is internally set to 10msec and offers protection against in-rush currents when the power is switched on and
also protects against voltage overshoot.

■APPLICATIONS

●PDAs

●Palmtop computers

●Digital cameras

●Various multi function power supplies

FEATURES

2 ch DC/DC Controller (Step-Down & Down)
Input Voltage Range : 2.0V ~ 10V

Power Supply Voltage Range : 2.0V ~ 10V
Output Voltage Range : 0.9V ~ 6.0V (set by FB pins)
Oscillation Frequency : 300kHz (±15%)

Maximum Duty Cycle : 100%
Control Method : PWM or PWM/PFM Selectable
Output Current : More than 1000mA

High Efficiency : 92% (TPY.)
Stand-By Function : 3.0μA (MAX.)
Soft-Start Time : 10 ms (internally set)

Packages : MSOP-10, USP-10
Environmentally Friendly : EU RoHS Compliant, Pb Free

TYPICAL APPLICATION CIRCUIT

<XC9503B093A VOUT①: 3.3V, VOUT②: 1.8V >

■TYPICAL PERFORMANCE
CHARACTERISTICS

●Efficiency vs. Output Current

☆GreenOperation Compatible

(180kHz, 500kHz custom)

(V

IN=5.0V, VOUT=3.3V)

1/32

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XC9503 Series

PIN CONFIGURATION

PIN ASSIGNMENT

PIN NUMBER PIN NAME FUNCTIONS

MSOP-10

(TOP VIEW)

USP-10

(BOTTOM VIEW)

1 EXT 1 Channel 1: External Transistor Drive Pin <Connected to P-ch Power MOSFET Gate>
2 VDD Supply Voltage

3 FB1

4 PWM1

5 EN1

6 EN2

7 PWM2

8 FB2

9 GND Ground

10 EXT2 Channel 2: External Transistor Drive Pin <Connected to P-ch Power MOSFET Gate>

PRODUCT CLASSIFICATION

●Ordering Information
XC9503①②③④⑤⑥‑⑦

Channel 1: Output Voltage Monitor Feedback Pin <Threshold value: 0.9V. Output voltage
can be set freely by connecting split resistors between V

Channel 1: PWM/PFM Switching Pin <Control Output 1. PWM control when connected to
VDD, PWM / PFM auto switching when connected to Ground. >

Channel 1: Enable Pin <Connected to Ground when Output 1 is in stand-by mode.
Connected to VDD when Output 1 is active. EXT1 is high when in stand-by mode.>

Channel 2: Enable Pin <Connected to Ground when Output 2 is in stand-by mode.
Connected to VDD when Output 2 is active. EXT2/ is high when in stand-by mode.>

Channel 2: PWM/PFM Switching Pin <Control Output 2. P WM control when connected to
VDD, PWM / PFM auto switching when connected to Ground.>

Channel 2: Output Voltage Monitor Feedback Pin <Threshold value: 0.9V. Output voltage
can be set freely by connecting split resistors between V

(*1)

OUT1 and Ground.>

OUT2 and Ground.>

DESIGNATOR ITEM SYMBOL DESCRIPTION

①

②③

④

⑤⑥-⑦

(*1)

The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.

(*1)

Type of DC/DC Controller B Standard type (10 Pin)

Output Voltage 09

2 180kHz (custom)

Oscillation Frequency

Packages (Order Unit)

3 300kHz
5 500kHz (custom)

AR MSOP-10 (1,000/Reel)

AR-G MSOP-10 (1,000/Reel)

DR USP-10 (3,000/Reel)

DR-G USP-10 (3,000/Reel)

FB products→②=0, ③=9 fixed

2/32

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A

BLOCK DIAGRAM

BSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL RATINGS UNITS

XC9503

Series

Ta=25℃

VDD Pin Voltage VDD - 0.3 ~ 12 V
FB1, 2 Pin Voltage VFB - 0.3 ~ 12 V
EN1, 2 Pin Voltage VEN - 0.3 ~ 12 V

PWM1, 2 Pin Voltage VPWM - 0.3 ~ 12 V

EXT1, 2 Pin Voltage VEXT - 0.3 ~ VDD + 0.3 V
EXT1, 2 Pin Current IEXT ± 100 mA

MSOP-10 150

Power Dissipation

Pd

USP-10

Operating Temperature Range Topr - 40 ~ + 85

Storage Temperature Range

Tstg - 55 ~ + 125

Note: Voltage is all ground standardized.

150

mW

℃
℃

3/32

XC9503 Series

XC9503B092A

Common Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage VDD 2.0 - 10.0 V ①

Maximum Input Voltage VIN 10.0 - - V ①

Output Voltage Range (* 1) VOUTSET VIN≧2.0V, IOUT1, 2=1mA

Supply Current 1 IDD1 FB1, 2=0V - 60 120 μA ②

Supply Current 1-1 IDD1-1
Supply Current 1-2 IDD1-2

Supply Current 2 IDD2 FB1, 2=1.0V - 60 140 μA ②
Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - 1.0 3.0 μA ②

Switching Frequency FOSC Same as IDD1 153 180 207 kHz ②
EN1, 2 "High" Voltage VENH FB1, 2=0V 0.65 - - V ②
EN1, 2 "Low" Voltage VENL FB1, 2=0V - - 0.20 V ②
EN1, 2 "High" Current IENH EN1, 2=3.0V - - 0.50 μA ②
EN1, 2 "Low" Current IENL EN1, 2=0V, FB1, 2=3.0V - - -0.50 μA ②

PWM1, 2 "High" Current IPWMH FB1, 2=3.0V, PWM=3.0V - - 0.50 μA ②

PWM1, 2 "Low" Current IPWML FB1, 2=3.0V, PWM=0V - - -0.50 μA ②

FB1, 2 "High" Current IFBH FB1, 2=3.0V - - 0.50 μA ②

FB1, 2 "Low" Current VFBL FB1, 2=1.0V - - -0.50 μA ②

Unless otherwise stated, VDD=3.0V, PWM1, 2=3.0V, EN1, 2 =3.0V

Output 1 Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB1 Voltage

Minimum Operation Voltage

Maximum Duty Ratio 1

Minimum Duty Ratio1 MINDTY1 Same as IDD2 - - 0 %

PFM Duty Ratio 1 PFMDTY1 No Load, VPWM1=0V 22 30 38 %

Efficiency1 (* 4) EFFI1

Soft-Start Time1 TSS1
EXT1 "High" ON Resistance REXTBH1 EN1=0, EXT1=VDD-0.4V - 28 47
EXT1 "Low" ON Resistance REXTBL1 FB2=0V, EXT1=0.4V - 22 30

PWM1 "High" Voltage
PWM1 "Low" Voltage

Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V

FB1 VIN=3.0V, IOUT1=10mA 0.882 0.900 0.918 V

V

VINmin1

MAXDTY1 Same as IDD1 100 - - %

PWMH1 No Load 0.65 - - V

V

PWML1 No Load - - 0.20 V

V

EN1=3.0V, EN2=0V, FB1=0V
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
FB1=1.0V, FB2=0V

Step-Down Controller

OUT1=250mA

I
P-ch MOSFET: XP162A12A6P

V

OUT1×0.95V, EN1=0V→0.65V

VOUT1 0.9 - 10.0 V

OUT2 0.9 - 10.0 V

V

- 50 110 μA ②

- 60 130 μA ②

- - 2.0 V ①

- 92 - % ④

5.0 10.0 20.0 ms

Output 2 Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB2 Voltage VFB2 VIN=3.0V, IOUT2=10mA 0.882 0.900 0.918 V

Minimum Operating Voltage VINmin2 - - 2.0 V

Maximum Duty Ratio 2 MAXDTY2 Same as IDD1 100 - - %

Minimum Duty Ratio 2 MINDTY2 Same as IDD2 - - 0 %

PFM Duty Ratio 2 PFMDTY2 No Load, VPWM2=0V 22 30 38 %

Efficiency 1 (* 2) EFFI2

Soft-Start Time 1 TSS2

EXT1 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V - 28 47

EXT1 "Low" ON Resistance REXTBL2 FB2=0V, EXT2=0.4V - 22 30

PWM 2 "High" Voltage VPWMH2 No Load 0.65 - - V ⑦

PWM 2 "Low" Voltage
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
NOTE:

*1: Please be careful not to exceed the breakdown voltage level of the peripheral parts.

*2: EFFI={ [ (output voltage) × (output current) ] / [ (input voltage)

PWML2

V

Step-Down Controller

OUT2=250mA

I
P-ch MOSFET: XP162A12A6P

V

OUT2×0.95V, EN2=0V→0.65V

No Load - - 0.20 V

- 92 - % ⑦

5.0 10.0 20.0 ms

× (input current) ] } × 100

Ta=25℃

①

③

②
②
④

④

Ω ⑤
Ω ⑤

④
④

⑥
①
②
②
⑦

⑦

Ω ⑤
Ω ⑤

⑦

4/32

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XC9503

Series

ELECTRICAL CHARACTERISTICS (Continued)

XC9503B093A

Common Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage VDD 2.0 - 10.0 V ①

Maximum Input Voltage VIN 10.0 - - V ①

V

Output Voltage Range (* 1) VOUTSET

Supply Current 1 IDD1

Supply Current 1-1 IDD1-1
Supply Current 1-2 IDD1-2

Supply Current 2 IDD2
Stand-by Current ISTB

Switching Frequency FOSC

EN1, 2 "High" Voltage VENH

EN1, 2 "Low" Voltage VENL

EN1, 2 "High" Current IENH

EN1, 2 "Low" Current IENL

PWM1, 2 "High" Current IPWMH

PWM1, 2 "Low" Current IPWML

FB1, 2 "High" Current IFBH

FB1, 2 "Low" Current

Unless otherwise stated, VDD=3.0V, PWM1, 2=3.0V, EN1, 2 =3.0V

Output 1 Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB 1 Voltage

Minimum Operating Voltage

Maximum Duty Ratio 1

Minimum Duty Ratio 1 MINDTY1 Same as IDD2 - - 0 %

PFM Duty Ratio 1 PFMDTY1 No Load, VPWM1=0V 22 30 38 %

Efficiency1 (* 4) EFFI1

Soft-Start Time 1 TSS1
EXT1 "High" ON Resistance REXTBH1 EN1=0, EXT1=VDD-0.4V - 28 47
EXT1 "Low" ON Resistance REXTBL1 FB2=0V, EXT1=0.4V - 22 30

PWM1 "High" Voltage

PWM1 "Low" Voltage

Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V

Output 2 Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB 2 Voltage VFB2 VIN=3.0V, IOUT2=10mA 0.882 0.900 0.918 V ⑥

Minimum Operating Voltage VINmin2 - - 2.0

Maximum Duty Ratio 2 MAXDTY2 Same as IDD1 100 - -

Minimum Duty Ratio 2 MINDTY2 Same as IDD2 - - 0

PFM Duty Ratio 2 PFMDTY2 No Load, VPWM2=0V 22 30 38

Efficiency 1 (* 2) EFFI2

Soft-Start Time 1 TSS2 VOUT2×0.95V, EN2=0V→0.65V 5.0 10.0 20.0
EXT1 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V - 28 47 Ω ⑤

EXT1 "Low" ON Resistance REXTBL2 FB2=0V, EXT2=0.4V - 22 30 Ω ⑤

PWM2 "High" Voltage VPWMH2 No Load 0.65 - - V ⑦

PWM2 "Low" Voltage
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
NOTE:

*1: Please be careful not to exceed the breakdown voltage level of the peripheral parts.
*2: EFFI={ [ (output voltage) × (output current) ] / [ (input voltage) × (input current) ] } × 100

FBL

V

FB1 VIN=3.0V IOUT1=10mA 0.882 0.900 0.918 V

V

VINmin1

MAXDTY1 Same as IDD1 100 - - %

PWMH1 No Load 0.65 - - V

V

PWML1 No Load - - 0.20 V

V

PWML2

V

IN≧2.0V, IOUT1, 2=1mA

FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V

EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
FB1=1.0V, FB2=0V
FB1, 2=1.0V

Same as I
Same as I
FB1, 2=0V
FB1, 2=0V
EN1, 2=3.0V
EN1, 2=0V, FB1, 2=3.0V
FB1, 2=3.0V, PWM=3.0V
FB1, 2=3.0V, PWM=0V
FB1, 2=3.0V
FB1, 2=1.0V

DD1, EN1=EN2=0V
DD1

Step-Down Controller

OUT1=250mA

I
P-ch MOSFET: XP162A12A6P

V

OUT1×0.95V, EN1=0V→0.65V

Step-Down Controller

OUT2=250mA

I
P-ch MOSFET: XP162A12A6P

No Load - - 0.20

VOUT1 0.9 - 10.0 V

OUT2 0.9 - 10.0 V

V

- 70 140 μA ②

- 60 120 μA ②

- 70 150 μA ②

- 80 150 μA ②

- 1.0 3.0 μA ②

255 300 345 kHz ②

0.65 - - V ②

- - 0.20 V ②

- - 0.50 μA ②

- - -0.50 μA ②

- - 0.50 μA ②

- - -0.50 μA ②

- - 0.50 μA ②

- - -0.50 μA ②

- - 2.0 V ①

- 92 - % ④

5.0 10.0 20.0 ms

- 92 - % ⑦

Ta=25℃

Ω ⑤
Ω ⑤

V
%
%
%

ms

V

①

③

②
②
④

④

④
④

①
②
②
⑦

⑦

⑦

5/32

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XC9503 Series

ELECTRICAL CHARACTERISTICS (Continued)

XC9503B095A

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage VDD 2.0 - 10.0 V ①

Maximum Input Voltage VIN 10.0 - - V ①

Output Voltage Range (* 1) VOUTSET

Supply Current 1 IDD1

Supply Current 1-1 IDD1-1
Supply Current 1-2 IDD1-2

Supply Current 2 IDD2
Stand-by Current ISTB

Switching Frequency FOSC

EN1, 2 "High" Voltage VENH

EN1, 2 "Low" Voltage VENL

EN1, 2 "High" Current IENH

EN1, 2 "Low" Current IENL

PWM1, 2 "High" Current IPWMH

PWM1, 2 "Low" Current IPWML

FB1, 2 "High" Current IFBH

FB1, 2 "Low" Current

Unless otherwise stated, VDD=3.0V, PWM1, 2=3.0V, EN1, 2 =3.0V

Output 1 Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB 1 Voltage

Minimum Operation Voltage

Maximum Duty Ratio 1

Minimum Duty Ratio 1 MINDTY1 Same as IDD2 - - 0 %

PFM Duty Ratio 1 PFMDTY1 No Load, VPWM1=0V 22 30 38 %

Efficiency1 (* 4) EFFI1

Soft-Start Time 1 TSS1
EXT1 "High" ON Resistance REXTBH1 EN1=0, EXT1=VDD-0.4V - 28 47
EXT1 "Low" ON Resistance REXTBL1 FB2=0V, EXT1=0.4V - 22 30

PWM1 "High" Voltage

PWM1 "Low" Voltage

Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V

Output 2 Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB 2 Voltage VFB2 VIN=3.0V, IOUT2=10mA 0.882 0.900 0.918 V ⑥

Minimum Operation Voltage VINmin2 - - 2.0 V ①

Maximum Duty Ratio 2 MAXDTY2 Same as IDD1 100 - - % ②

Minimum Duty Ratio 2 MINDTY2 Same as IDD2 - - 0 % ②

PFM Duty Ratio 2 PFMDTY2 No Load, VPWM2=0V 22 30 38 % ⑦

Efficiency 1 (* 2) EFFI2

Soft-Start Time 1 TSS2 VOUT2×0.95V, EN2=0V→0.65V 5.0 10.0 20.0 ms ⑦
EXT1 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V - 28 47 Ω ⑤

EXT1 "Low" ON Resistance REXTBL2 FB2=0V, EXT2=0.4V - 22 30 Ω ⑤

PWM2 "High" Voltage VPWMH2 No Load 0.65 - - V ⑦

PWM2 "Low" Voltage
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
NOTE:

*1 : Please be careful not to exceed the breakdown voltage level of the peripheral parts.
*2 : EFFI={ [ (output voltage) × (output current) ] / [ input voltage] × (input current) ] } × 100

Common Characteristics

V

IN≧2.0V, IOUT1, 2=1mA

FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V

EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
FB1=1.0V, FB2=0V
FB1, 2=1.0V

Same as I
Same as I
FB1, 2=0V
FB1, 2=0V
EN1, 2=3.0V
EN1, 2=0V, FB1, 2=3.0V
FB1, 2=3.0V, PWM=3.0V
FB1, 2=3.0V, PWM=0V
FB1, 2=3.0V

FBL

V

FB1, 2=1.0V

Step-Down Controller

FB1 VIN=3.0V, IOUT1=10mA 0.882 0.900 0.918 V

V

VINmin1

MAXDTY1 Same as IDD1 100 - - %

PWMH1 No Load 0.65 - - V

V

PWML1 No Load - - 0.20 V

V

OUT1=250mA

I
P-ch MOSFET: XP162A12A6P

V

OUT1×0.95V, EN1=0V→0.65V

Step-Down Controller

OUT2=250mA

I
P-ch MOSFET: XP162A12A6P

PWML2

V

No Load - - 0.20 V ⑦

DD1, EN1=EN2=0V
DD1

VOUT1 0.9 - 10.0 V

OUT2 0.9 - 10.0 V

V

- 90 170 μA ②

- 80 150 μA ②

- 100 180 μA ②

- 100 190 μA ②

- 1.0 3.0 μA ②

425 500 575 kHz ②

0.65 - - V ②

- - 0.20 V ②

- - 0.50 μA ②

- - -0.50 μA ②

- - 0.50 μA ②

- - -0.50 μA ②

- - 0.50 μA ②

- - -0.50 μA ②

- - 2.0 V ①

- 91 - % ④

5.0 10.0 20.0 ms

- 91 - % ⑦

Ta=25℃

①

③

②
②
④

④
Ω ⑤
Ω ⑤

④

④

6/32

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XC9503

Series

OPERATIONAL EXPLANATION

The XC9503 series are multi-functional, 2 channel step-down DC/DC converter controller ICs with built-in high speed, low ON
resistance drivers.

<Error Amp. 1, 2>
The Error Amplifier is designed to monitor the output voltage and it compares the feedback voltage (FB) with the reference
voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the error amp.
decreases.

<OSC Generator>

This circuit generates the switching frequency, which in turn generates the reference clock.

<Ramp Wave Generator 1, 2>

The ramp wave generator generates a saw-tooth waveform based on outputs from the phase shift generator.

<PWM Comparator 1, 2>

The PWM comparator compares outputs from the error amp. and saw-tooth waveform. When the voltage from the error
amp's output is low, the external switch will be set to ON.

<PWM/PFM Controller 1, 2>

This circuit generates PFM pulses.
Control can be switched between PWM control and PWM/PFM automatic switching control using extern al signals.
The PWM/PFM automatic switching mode is selected when the voltage of the PWM1 (2) pin is less than 0.2V, and the control
switches between PWM and PFM automatically depending on the loa d. As the PFM circuit generates pulses based on
outputs from the PWM comparator, shifting between modes occurs smoothly. PWM control mode is selected when the
voltage of the PWM1 (2) pin is more than 0.65V. Noise is easily reduced with PWM control since the switching frequency is
fixed.
Control suited to the application can easily be selected which is useful in audio applicatio ns, for example, where traditionall y,
efficiencies have been sacrificed during stand-by as a result of using PWM control (due to the noise problems associated with
the PFM mode in stand-by).

<Vref with Soft Start 1, 2>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjuste d and fixe d by laser trimming (for output voltage settings, pl ease
refer to next page). To protect against inrush current, when the power is switched on, and also to protect against voltage
overshoot, soft-start time is set internally to 10ms. It should be noted, ho wever, that this circuit does not protect the load
capacitor (C

L) from inrush current. With the Vref voltage limited and depending upon the input to the error amps, the operation

maintains a balance between the two inputs of the error amps and controls the EXT pin's ON time so that it doesn't increase
more than is necessary.

<Chip Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the EN1 or EN2 pins is 0.2V or less, the
mode will be chip disable, the channel's operations will stop and the EXT pins will be kept at a high level (the ext ernal P-ch
MOSFET will be OFF). When both EN1 and EN2 are in a state of chip disable, current consumption will be no more than 3.0
μA. When the EN1 or EN2 pin's voltage is 0.65V or more , the mode will be chip enable and op erations will recommence.
With soft-start, 95% of the set output voltage will be reached within 10mS (TYP.) from the moment of chip enable.

7/32

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)

XC9503 Series

OPERATIONAL EXPLANATION (Continued

<Setting of Output Voltage>

Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based
on the values of RFB11 (RFB21) and RFB12 (RFB22). The sum of RFB11 (RFB21) and RFB12 (RFB22) should normally be 1MΩor
less.

The value of C
equal to 12kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and
value of load capacity (C

[Example of Calculation]

When R

[Typical Example]

FB11=200k

VOUT

(V)

FB1 (CFB2), speed-up capacitor for phase compensation, should be fzfb= 1 / (2

L).

Ω

and RFB12=75kΩ, VOUT1=0.9×(200k+75k) / 75k=3.3V.

RFB11

(kΩ)

1.0 30 270 430 2.5 390 220 33

1.5 220 330 62 2.7 360 180 33

1.8 220 220 62 3.0 560 240 24

2.0 330 270 39 3.3 200 75 62

2.2 390 270 33 5.0 82 18 160

The same method can be adopted for channel two also.

[External Components]

Tr : * MOSFET

SD :

L :

CL1 :

Tr :

R

CB :

The same components can be adopted for both channel 1 and channel 2.

XP162A12A6P
Note: V
please be careful with the power supply voltage.

MA2Q737 (Schottky, MATSUSHITA)
CMS02 (Schottky, TOSHIBA)
10μH
22μH (CDRH5D28, SUMIDA, FOSC = 300kHz)
22μH (CDRH5D28, SUMIDA, FOSC = 180kHz)
16V, 47μF (Tantalum)
Increase capacity according to the equation below when the step-up
voltage ratio is large and output current is high.

C=(C

L standard value)

* PNP MOSFET
2SA1213 (SANYO)

B :

500Ω ( Adjust in accordance with load & Tr.'s HFE.)
Set according to the equation below.

B ≦ (VIN-0.7) × hFE / IC-REXTBH

R
2200pF (Ceramic)
Set according to the equation below.

C

B1

≦

(2π× RB × FOSC × 0.7)

(P-ch Power MOSFET, TOREX)

GS breakdown voltage of this Tr. is 12V so

(CDRH5D28, SUMIDA, FOSC = 500kHz)

×

RFB12

(kΩ)

OUT=0.9

V

×

(RFB11+RFB12) /RFB12

CFB1

(pF)

(IOUT (mA) / 500mA×VOUT / VIN

VOUT

(V)

RFB11

(kΩ)

×π×

CFB1×RFB11) which is

RFB12

(kΩ)

CFB1

(pF)

8/32

■

TEST CIRCUITS

Circuit 1

Circuit ①

V OUT1

RFB11

CFB1 CFB2

CL1

RL1

RFB12

PNP

L1

Tr1

2200pF

510Ω

SBD1

1μF

V I

N

1 EXT1 EX T2 10

2 VDD

3 FB1 FB2 8

4 PW M 1 PWM 2 7

5 EN1 EN 2 6

GND 9

PNP

Tr2

2200pF

C

IN

SBD2

L2

R

RFB22

V OUT2

FB21

CL2

RL2

510Ω

Circuit 2

Circuit ② Circuit ⑥

EXT2 10

A

OSC

1μF

A

A

V

V

FB1

VPWM1 V EN1

DD

1 EXT1

2 VDD

3 FB1 FB2 8

4 PWM 1 PWM 2 7

A

5 EN1 EN2 6

GND 9

A

A

V PWM2

VEN2

OS C

A

VFB2

Circuit 3

VOU T 1

L1

A

V

CL1

RL

Pch

MOSFET1

SBD1

1 EXT1 EXT2 10

2 VDD

GN D 9

3 FB1 FB 2 8

4 PW M 1 PW M 2 7

5 EN1 EN2 6

A

V IN

CIN

CIN

Circuit 4

Circuit ④

A

CL1

V

RL

VOUT1

200 k Ω

75k Ω

L1

62pF

Pch

MOSFET1

SBD1

1 EXT1 EXT2 10

2 VDD

GN D 9

3 FB1 FB2 8

4 PWM1 PWM2 7

5 EN1 EN2 6

A

VIN

CIN

Circuit 5

Circuit ⑤

A

1μ F

EXT1

V

Circuit 6

A

V IN

Circuit 7

Circuit ⑦ Circuit ③

A

VIN

V

DD

FB1

V

1 EXT1 EXT2 10

2 VDD

3 FB1 FB2 8

4 PWM1 PWM2 7

5 EN1 EN2 6

1 EXT1 EXT2 10

2 VDD

3 FB1 FB2 8

4 PW M 1 PWM 2 7

5 EN1 EN2 6

V PWM 1

V EN1

GND 9

GND 9

1 EXT1 EXT2 10

GN D 9

2 VDD

3 FB1 FB 2 8

4 PWM1 PWM2 7

5 EN1EN2 6

VEN2

Pch

MOSFET2

SBD2

Pch

MOSFET2

SB D2

62pF

V PWM2

L2

L2

XC9503

Series

C

IN

VEXT2

V FB2

VOUT2

A

CL2

L

R

VOUT2

A

20 0 k Ω

CL2

L

R

75 k Ω

A

V

V

9/32

■

XC9503 Series

EXTERNAL COMPONENTS USED FOR TEST CIRCUITS

Circuit ①

SD1, SD2: CRS02 (Schottk y diode, TOSHIBA)
EC10QS06 (Schottky diode, NIHON INTER)
CL1, CL2: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
PNP Tr1: 2SA1213 (TOSHIBA)
RFB: Please use by the conditions as below:

CFB: Please adjust as below:

Circuit ③
SD1: MA2Q737 (Schottky diode, MATSUSHITA)
CL1: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET1: XP162A12A6P (TOREX)

Circuit ④

SD1: MA2Q737 (Schottky diode, MATSUSHITA)
CL1: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET1: XP162A12A6P (TOREX)

Circuit ⑥
SD1: MA2Q737 (Schottky diode, MATSUSHITA)
CL1: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET2: XP162A12A6P (TOREX)

Circuit ⑦

SD2: MA2Q737 (Schottky diode, MATSUSHITA)
CL2: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN: 16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET2: XP162A12A6P (TOREX)

L1, L2:

L1:

L1:

L1:

L2:

22μH (CDRH5D28, SUMIDA)
15μH (CDRH5D28, SUMIDA)
10μH (CDRH5D28, SUMIDA)

FB11 + RFB12 < 1M

R

FB21 + RFB22 < 1M

R

FB11 / RFB12 = (Setting output voltage / 0.9) - 1

R

OUT2= (0.9 – VOUT1) x (RFB21/RFB22) + 0.9V

V

fxfb=1/(2 x π x CFB1 x RFB11) = 1kHz ~ 50kHz (12kHz usual)
fxfb=1/(2 x π x CFB2 x RFB21) = 1kHz ~ 50kHz (12kHz usual)

22μH (CDRH5D28, SUMIDA)

22μH (CDRH5D28, SUMIDA)
15μH (CDRH5D28, SUMIDA)
10μH (CDRH5D28, SUMIDA)

22μH (CDRH5D28, SUMIDA)

22μH (CDRH5D28, SUMIDA)
15μH (CDRH5D28, SUMIDA)
10μH (CDRH5D28, SUMIDA)

Ω
Ω

: XC9503B092A
: XC9503B093A
: XC9503B095A

: XC9503B092A
: XC9503B093A
: XC9503B095A

: XC9503B092A
: XC9503B093A
: XC9503B095A

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