TOREX XC9501 User Manual

XC9501 Series

ETR0701_004a

2ch.Step-Up/Up DC/DC Controller ICs

■GENERAL DESCRIPTIO N

The XC9501 series are PWM controlled, PWM/PFM automatic switching controlled, multi-functi onal, dual step-up DC/DC

converter controller ICs.
With 0.9V (±2%) of standard voltage supply internal, and using externally connected components, output voltage can be
set freely on both DC/DC controllers between 1.5V to 30V.
With a 180kHz frequency, the size of the external components can be reduced. 100kHz, 300kHz and 500kHz switching
frequencies are also available as custom-designed products.
The control of the XC9501 series can be switched bet ween PWM control and PWM/PFM automatic switching control usi ng
external signals. Control s witches from PWM to PFM during light loads when automatic switching is selected and the series
is highly efficient from light loads to large output currents. Noise is easily reduced with PWM control since the switching
frequency is fixed.
The XC9501 series provides the option of being able to select the control suited to the application.
Soft-start time is internally set to 10msec which offers protection against rush currents when the power is switched on and
also against voltage overshoot

■APPLICATIONS

●PDAs

●Palm top computers

●Portable audio systems

●Various multi-function power supplies

■TYPICAL APPLICATION CIRCUIT

( XC9501B092A Input: 2 cells, Output ①: 3.3V, Output ②: 5.0V )

.

■FEATURES

2ch DC/DC Controller : (Step-Up + Step-Up)
Input Voltage Range : 0.9V ~ 10V
Supply Voltage Range
Output Voltage Range : 1.5V ~ 30V (set by FB1/FB2 pins)
Output Current : More than 200mA

(V
Switching Frequency : 180kHz (±15%)
100kHz, 300kHz & 500kHz
as custom

Maximum Duty Cycle : 80% (TYP .)
Control Method : PWM or PWM/PFM Selectable
High Efficincy : 83% (TYP .)
Stand-by Current : 3.0μA (MAX.)
Soft-start : internally set-up
Package : MSOP-10, USP-10
Environmentally Friendly

■TYPICAL PERFORMANCE
CHARACTERISTICS

●Efficiency vs. Output Current

☆GreenOperation Compatible

: 2.0V ~ 10V

IN=1.8V, VOUT=3.3V)

: EU RoHS Compliant, Pb Free

1/27

XC9501 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

PIN NUMBER PIN NAME FUNCTION

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

Channel 1: Output Voltage Monitor Feedback Pin

3 FB1

<Threshold value: 0.9V. Output Voltage can be set freely by connecting split resistor
between V

OUT1 and GND.>

Channel 1: PWM/PFM Switching Pin

4 PWM1

<Control Output 1. PMW control when connected to V
connected to GND.>

Channel 1: Enable Pin

5 EN1

<Connected to GND when Output 1 is in stand-by mode. Connected to VDD when Output 1
is active. EXT1 is low when in stand-by mode.>

Channel 2: Enable Pin

6 EN2

<Connected to GND 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

7 PWM2

<Control Output 2. PMW control when connected to V
connected to GND.>

Channel 2: Output Voltage Monitor Feedback Pin

8 FB2

<Threshold value: 0.9V. Output Voltage can be set freely by connecting split resistor
between V

OUT2 and GND.>

9 GND Ground

10 EXT2

■PRODUCT CLASSIFICATION

●Ordering Information

XC9501 ①②③④⑤⑥-⑦

DESIGNATOR

(*1)
(*2)

①

②③

④

⑤⑥-⑦

The “-G” suffix indicates that the products are Halogen and Antimony free as well as being fully RoHS compliant.
The device orientation is fixed in its embossed tape pocket. For reverse orientation, please contact your local Torex sales office or

representative. (Standard orientation: ⑤R-⑦, Reverse orientation: ⑤L-⑦)

Channel2: External Transistor Drive Pin

<Connected to N-ch Power MOSFET Gate>

(*1)

DESCRIPTION

Type of DC/DC Controller

Output Voltage

Oscillation Frequency

Packages

Taping Type

(*１)

SYMBOL DESCRIPTION

B Standard (10 Pin)

09

1 100kHz (custom)
2 180kHz
3 300kHz (custom)
5 500kHz (custom)

AR MSOP-10

AR-G MSOP-10

DR USP-10

DR-G USP-10

2/27

USP-10

(BOTTOM VIEW)

DD, PWM/PFM auto Switching when

DD, PWM/PFM auto Switching when

FB Voltage: 0.9V

A

■BLOCK DIAGRAM

■

BSOLUTE MAXIMUM RATINGS

PARAMETER SYMBOL RATINGS UNITS

VDD Pin Voltage VDD - 0.3 ~ 12.0 V
FB1, 2 Pin Voltage VFB - 0.3 ~ 12.0 V
EN1, 2 Pin Voltage VEN - 0.3 ~ 12.0 V

PWM1, 2 Pin Voltage VPWM - 0.3 ~ 12.0 V

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

Power Dissipation

Operating Temperature Range Topr - 40 ~ + 85

Storage Temperature Range Tstg - 55 ~ + 125

MSOP-10 150

USP-10

Pd

±100

150

XC9501

Series

Ta=25℃

mA

mW

℃
℃

3/27

XC9501 Series

■ELECTRICAL CHARACTERISTICS

XC9501B091A Common Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage

Output Voltage Range

Supply Current 1 IDD1 FB1, 2=0V - 70 100 μA ④

Supply Current 1-1 IDD1-1

Supply Current 1-2 IDD1-2

Supply Current 2 IDD2 FB1, 2=1.0V - 60 90 μA ④

Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - - 3.0 μA ④
Oscillation Frequency FOSC Same as IDD1 85 100 115 kHz ④
EN1, 2 "High" Voltage VENH FB1, 2=0V 0.65 - - V ④

EN1, 2 "Low" Voltage VENL FB1, 2=0V - - 0.20 V ④

EN1, 2 "High" Current IENH FB1, 2=3.0V - - 0.50 μA ④

EN1, 2 "Low" Current IENL EN1, 2=0V, FB1, 2=3.0V - - -0.50 μA ④

PWM1, 2 "High" Current IPWMH FB1, 2=3.0V, PWM=3.0V - - 0.50 μA ④

PWM1, 2 "Low" Current IPWML FB1, 2=3.0V, PWM=0V - - -0.50 μA ④

FB1, 2 "High" Current IFBH FB1, 2=3.0V - - 0.50 μA ④

FB1, 2 "Low" Current VFBL FB1, 2=1.0V - - -0.50 μA ④

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

(* 1)

VDD 2.0 - 10.0 V -

VDD≧2.0V IOUT1,2=1mA VOUT1, VOUT2 0.9 - - V ①

(* 4)

VIN ≧0.9V IOUT1,2=1mA

V

IN≧0.9V IOUT1,2=1mA

EN1=3.0V, EN2=0V, FB1=0V
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
FB1=1V, FB2=0V

(* 2)

(* 3)

VOUT1 2.0 - 10.0 V
V
VOUT1 0.9 - - V
V

Output 1 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB1 Voltage VFB1 VDD=3.0V, VIN=1.5V, IOUT1=10mA 0.882 0.900 0.918 V ⑤

Operation Start-up

Voltage 1

Oscillation Start Voltage 1 VST2-1 FB1=0V - - 0.8 V ④

Maximum Duty Ratio 1 MAXDTY1 Same as IDD1 75 80 88 % ④

PFM Duty Ratio 1 PFMDTY1 No Load, VPWM1=0V 22 30 38 % ⑥

Efficiency 1 EFFI1 IOUT1=100mA N-ch MOSFET: XP161A1355P - 83 - % ⑥

Soft-Start Time 1 TSS1 VOUT1×0.95V, EN1=0V→0.65V 5.0 10.0 20.0 ms ⑥

EXT1 "High" ON Resistance

EXT1 "Low" ON Resistance

PWM1 "High" Voltage VPWMH1 No Load 0.65 - - V ⑥
PWM1 "Low" Voltage VPWML1 No Load - - 0.20 V ⑥

Unless otherwise stated, VDD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V

(* 2)

V

ST1-1

REXTBH1 FB1=0, EXT1=VDD-0.4V - 28 47 Ω ⑦
REXTBL1 EN1=FB2=0V, EXT1=0.4V - 22 30 Ω ⑦

Using Tr: 2SD1628,
IOUT=1.0mA, RFB11=200kΩ, RFB12=75kΩ
V

DD ≠VOUT1: IOUT1=1mA - - 2.0 V ①

Output 2 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

FB2 Voltage VFB2 VDD=3.0V, VIN=1.5V, IOUT1=10mA 0.882 0.900 0.918 V ⑧

Operation Start-up

Voltage2

Oscillation Start Voltage 2 VST2-2 FB2=0V - - 0.8 V ④

Maximum Duty Ratio 2 MAXDTY2 Same as IDD1 75 80 85 % ④

PFM Duty Ratio 2 PFMDTY2 No Load, VPWM2=0V 22 25 38 % ⑨

Efficiency 2 EFFI2 IOUT2=100mA, N-ch MOSFET: XP161A1355P - 83 - % ⑨

Soft-Start Time 2 TSS2 VOUT1 × 0.95V, EN2=0V→0.65V 5.0 10.0 20.0 ms ⑨
EXT2 "High" ON Resistance
EXT2 "Low" ON Resistance

PWM2 "High" Voltage VPWMH2 No Load 0.65 - - V ⑨

PWM2 "Low" Voltage VPWML2 No Load - - 0.20 V ⑨

Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=1.8V

(* 3)

V

ST1-2

REXTBH2 FB2=0, EXT2=VDD-0.4V - 28 47 Ω ⑦
REXTBL2 EN2=FB2=0V, EXT2=0.4V - 22 30 Ω ⑦

Using Tr: 2SD1628,
IOUT1=1.0mA, RFB21=200kΩ,RFB22=75kΩ
V

DD≠VOUT2 : IOUT2=1mA - - 2.0 V ①

4/27

(FOSC = 100kHz)

OUT2 0.9 - - V

OUT2 2.0 - 10.0 V

- 50 80 μA ④

- 80 150 μA ④

(FOSC = 100kHz)

- - 0.9 V ②

(FOSC = 100kHz)

- - 0.9 V ③

Ta=25℃

②

③

Ta=25℃

Ta=25℃

CIRCUIT

■ELECTRICAL CHARACTERISTICS (Continued)

XC9501B092A Common Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage

(* 1)

VDD 2.0 - 10.0 V -

VDD≧2.0V IOUT1,2=1mA VOUT1, VOUT2 0.9 - - V ①

VOUT1 2.0 - 10.0 V
V
VOUT1 0.9 - - V
V

Output Voltage Range

(* 4)

VIN ≧0.9V IOUT1,2=1mA

V

IN≧0.9V IOUT1,2=1mA

(* 2)

(* 3)

Supply Current 1 IDD1 FB1, 2=0V - 90 160 μA ④

Supply Current 1-1 IDD1-1

Supply Current 1-2 IDD1-2

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

FB1=1V, FB2=0V
Supply Current 2 IDD2 FB1, 2=1.0V - 70 132 μA ④
Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - - 3.0 μA ④

Oscillation Frequency FOSC Same as IDD1 153 180 207 kHz ④
EN1, 2 "High" Voltage VENH FB1, 2=0V 0.65 - - V ④

EN1, 2 "Low" Voltage VENL FB1, 2=0V - - 0.20 V ④

EN1, 2 "High" Current IENH FB1, 2=3.0V - - 0.50 μA ④

EN1, 2 "Low" Current IENL EN1, 2=0V, FB1, 2=3.0V - - -0.50 μA ④

PWM1, 2 "High" Current IPWMH FB1, 2=3.0V, PWM=3.0V - - 0.50 μA ④

PWM1, 2 "Low" Current IPWML FB1, 2=3.0V, PWM=0V - - -0.50 μA ④

FB1, 2 "High" Current IFBH FB1, 2=3.0V - - 0.50 μA ④

FB1, 2 "Low" Current VFBL FB1, 2=1.0V - - -0.50 μA ④

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

Output 1 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB1 Voltage VFB1 VDD=3.0V, VIN=1.5V, IOUT1=10mA 0.882 0.900 0.918 V ⑤

Operation Start-up

Voltage 1

(* 2)

V

ST1-1

Using Tr: 2SD1628,
IOUT=1.0mA, RFB11=200kΩ, RFB12=75kΩ
V

DD ≠VOUT1: IOUT1=1mA - - 2.0 V ①

Oscillation Start Voltage 1 VST2-1 FB1=0V - - 0.8 V ④

Maximum Duty Ratio 1 MAXDTY1 Same as IDD1 75 80 88 % ④

PFM Duty Ratio 1 PFMDTY1 No Load, VPWM1=0V 22 30 38 % ⑥

Efficiency 1 EFFI1 IOUT1=100mA N-ch MOSFET: XP161A1355P - 83 - % ⑥

Soft-Start Time 1 TSS1 VOUT1×0.95V, EN1=0V→0.65V 5.0 10.0 20.0 ms ⑥

EXT1 "High" ON Resistance

EXT1 "Low" ON Resistance

REXTBH1 FB1=0, EXT1=VDD-0.4V - 28 47 Ω ⑦

REXTBL1 EN1=FB2=0V, EXT1=0.4V - 22 30 Ω ⑦
PWM1 "High" Voltage VPWMH1 No Load 0.65 - - V ⑥
PWM1 "Low" Voltage VPWML1 No Load - - 0.20 V ⑥

Unless otherwise stated, VDD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V

Output 2 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

FB2 Voltage VFB2 VDD=3.0V, VIN=1.5V, IOUT1=10mA 0.882 0.900 0.918 V ⑧

Operation Start-up

Voltage2

(* 3)

V

ST1-2

Oscillation Start Voltage 2 VST2-2 FB2=0V - - 0.8 V ④

Maximum Duty Ratio 2 MAXDTY2 Same as IDD1 75 80 85 % ④

PFM Duty Ratio 2 PFMDTY2 No Load, VPWM2=0V 22 25 38 % ⑨

Efficiency 2 EFFI2 IOUT2=100mA, N-ch MOSFET: XP161A1355P - 83 - % ⑨

Soft-Start Time 2 TSS2 VOUT1 × 0.95V, EN2=0V→0.65V 5.0 10.0 20.0 ms ⑨
EXT2 "High" ON Resistance
EXT2 "Low" ON Resistance

REXTBH2 FB2=0, EXT2=VDD-0.4V - 28 47 Ω ⑦
REXTBL2 EN2=FB2=0V, EXT2=0.4V - 22 30 Ω ⑦

PWM2 "High" Voltage VPWMH2 No Load 0.65 - - V ⑨

PWM2 "Low" Voltage VPWML2 No Load - - 0.20 V ⑨

Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=1.8V

Using Tr: 2SD1628,
IOUT1=1.0mA, RFB21=200kΩ,RFB22=75kΩ
V

DD≠VOUT2 : IOUT2=1mA - - 2.0 V ①

(FOSC = 180kHz)

OUT2 0.9 - - V

OUT2 2.0 - 10.0 V

- 60 120 μA ④

- 80 150 μA ④

(FOSC = 180kHz)

- - 0.9 V ②

(FOSC = 180kHz)

- - 0.9 V ③

XC9501

Series

Ta=25℃

②

③

Ta=25℃

Ta=25℃

CIRCUIT

5/27

XC9501 Series

■ELECTRICAL CHARACTERISTICS (Continued)

XC9501B093A Common Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage

Output Voltage Range

Supply Current 1 IDD1 FB1, 2=0V - 110 250 μA ④

Supply Current 1-1 IDD1-1

Supply Current 1-2 IDD1-2

Supply Current 2 IDD2 FB1, 2=1.0V - 80 160 μA ④
Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - - 3.0 μA ④

Oscillation Frequency FOSC Same as IDD1 255 300 345 kHz ④

EN1, 2 "High" Voltage VENH FB1, 2=0V 0.65 - - V ④

EN1, 2 "Low" Voltage VENL FB1, 2=0V - - 0.20 V ④

EN1, 2 "High" Current IENH FB1, 2=3.0V - - 0.50 μA ④

EN1, 2 "Low" Current IENL EN1, 2=0V, FB1, 2=3.0V - - -0.50 μA ④

PWM1, 2 "High" Current IPWMH FB1, 2=3.0V, PWM=3.0V - - 0.50 μA ④

PWM1, 2 "Low" Current IPWML FB1, 2=3.0V,PWM=0V - - -0.50 μA ④

FB1, 2 "High" Current IFBH FB1, 2=3.0V - - 0.50 μA ④
FB1, 2 "Low" Current VFBL FB1, 2=1V - - -0.50 μA ④

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

(* 1)

VDD 2.0 - 10.0 V

VDD≧2.0V, IOUT1, 2 =1mA VOUT1, VOUT2

(* 4)

VOUTSET

VIN≧0.9V, IOUT1, 2=1mA

V

IN≧0.9V, IOUT1, 2=1mA

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

(* 2)

(* 3)

VOUT1 2.0 - 10.0 V
VOUT2 0.9 - - V
VOUT1 0.9 - - V
VOUT2 2.0 - 10.0 V

Output 1 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

FB1 Voltage VFB1 VDD=3.0V, VIN=1.5V, IOUT1=10mA 0.882 0.900 0.918 V ⑤

Operation Start Voltage 1

Oscillation Start Voltage 1 VST2-1 FB1=0V - - 0.8 V ④

Maximum Duty Ratio 1 MAXDTY1 Same as IDD1 75 80 85 % ④

PFM Duty Ratio 1 PFMDTY1 No Load, VPWM1=0V 22 30 38 % ⑥

Efficiency 1 EFFI1 IOUT1=100mA, N-ch MOSFET: XP161A1355P - 83 - % ⑥

Soft-Start Time 1 TSS1 VOUT1×0.95V, CE1=0V→0.65V 5.0 10.0 20.0 ms ⑥

EXT1 "High" ON Resistance

EXT1 "Low" ON Resistance

PWM1 "High" Voltage VPWMH1 No Load 0.65 - - V ⑥
PWM1 "Low" Voltage VPWML1 No Load - - 0.20 V ⑥

Unless otherwise stated, VDD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V

(* 2)

VST1-1

REXTBH1 FB1=0, EXT1=VDD-0.4V - 28 47 Ω ⑦

REXTBL1 EN1=FB2=0V, EXT1=0.4V - 22 30 Ω ⑦

Using Tr: 2SD1628,
IOUT=1.0mA, RFB11=200kΩ, RFB12=75kΩ
V

DD ≠VOUT1: IOUT1=1mA - - 2.0 V ①

Output 2 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

FB2 Voltage VFB2 VDD=3.0V, VIN=1.5V, IOUT2=10mA 0.882 0.900 0.918 V ⑧

Operation Start Voltage 2

Oscillation Start-up Voltage2 VST2-2 FB2=0V - - 0.8 V ④

Maximum Duty Ratio 2 MAXDTY2 Same as IDD1 75 80 85 % ④

PFM Duty Ratio 2 PFMDTY2 No Load, VPWM2=0V 22 30 38 % ⑨

Efficiency 2 EFFI2 IOUT2=100mA, N-ch MOSFET: XP161A1355P - 83 - % ⑨

Soft-Start Time 2 TSS2 VOUT2×0.95V, EN2=0V→0.65V 5.0 10.0 20.0 ms ⑨

EXT2 "High" ON Resistance
EXT2 "Low" ON Resistance

PWM2 "High" Voltage VPWMH2 No Load 0.65 - - V ⑨

PWM2 "Low" Voltage VPWML2 No Load - - 0.20 V ⑨

Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=1.8V

(* 3)

VST1-2

REXTBH2 FB2=0, EXT2=VDD-0.4V - 28 47 Ω ⑦

REXTBL2 EN2=FB2=0V, EXT2=0.4V - 22 30 Ω ⑦

Using Tr: 2SD1628,
IOUT2=1.0mA, RFB21=200kΩ,RFB22=75kΩ
V

DD ≠VOUT2 : IOUT2=1mA - - 2.0 V ①

6/27

(FOSC = 300kHz)

0.9 - - V ①

- 80 150 μA ④

- 90 200 μA ④

(FOSC = 300kHz)

- - 0.9 V ②

(FOSC = 300kHz)

- - 0.9 V ③

Ta=25℃

②

③

Ta=25℃

CIRCUIT

Ta=25℃

CIRCUIT

■ELECTRICAL CHARACTERISTICS (Continued)

XC9501B095A Common Characteristics

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage

Output Voltage Range

Supply Current 1 IDD1 FB1, 2=0V - 165 350 μA ④

Supply Current 1-1 IDD1-1

Supply Current 1-2 IDD1-2

Supply Current 2 IDD2 FB1, 2=1.0V - 100 200 μA ④
Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - - 3.0 μA ④

Switching Frequency FOSC Same as IDD1 425 500 575 kHz ④

EN1, 2 "High" Voltage VENH FB1, 2=0V 0.65 - - V ④

EN1, 2 "Low" Voltage VENL FB1, 2=0V - - 0.20 V ④

EN1, 2 "High" Current IENH FB1, 2=3.0V - - 0.50 μA ④

EN1, 2 "Low" Current IENL EN1, 2=0V, FB1,2=3.0V - - -0.50 μA ④
PWM1, 2 "High" Current IPWMH FB1, 2=3.0V, PWM=3.0V - - 0.50 μA ④
PWM1, 2 "Low" Current IPW ML FB1, 2=3.0V,PWM=0V - - -0.50 μA ④

FB1, 2 "High" Current IFBH FB1, 2=3.0V - - 0.50 μA ④

FB1, 2 "Low" Current VFBL FB1, 2=1.0V - - -0.50 μA ④

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

(* 1)

VDD 2.0 - 10.0 V

VDD≧2.0V, IOUT1, 2 =1mA VOUT1, VOUT2

(* 4)

VOUTSET

VIN≧0.9V, IOUT1, 2=1mA

V

IN≧0.9V, IOUT1, 2=1mA

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

(* 2)

(* 3)

VOUT1 2.0 - 10.0 V

OUT2 0.9 - - V

V
VOUT1 0.9 - - V
VOUT2 2.0 - 10.0 V

Output 1 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB1 Voltage VFB1 VDD=3.0V, VIN=1.5V, IOUT1=10mA 0.882 0.900 0.918 V ⑤

Operation Start Voltage 1

Oscillation Start Voltage 1 VST2-1 FB1=0V - - 0.8 V ④

Maximum Duty Ratio 1 MAXDTY1 Same as IDD1 75 80 85 % ④

PFM Duty Ratio 1 PFMDTY1 No Load, VPWM1=0V 22 30 38 % ⑥

Efficiency 1 EFFI1 IOUT1=100mA, N-ch MOSFET: XP161A1355P - 83 - % ⑥

Soft-Start Time 1 TSS1 VOUT1×0.95V, CE1=0V→0.65V 5.0 10.0 20.0 ms ⑥

EXT1 "High" ON Resistance

EXT1 "Low" ON Resistance

PWM1 "High" Voltage VPWMH1 No Load 0.65 - - V ⑥

PWM1 "Low" Voltage VPWML1 No Load - - 0.20 V ⑥

Unless otherwise stated, VDD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V

(* 2)

VST1-1

REXTBH1 FB1=0, EXT1=VDD-0.4V - 28 47 Ω ⑦
REXTBL1 EN1=FB2=0V, EXT1=0.4V - 22 30 Ω ⑦

Using Tr: 2SD1628,
IOUT=1.0mA, RFB11=200kΩ, RFB12=75kΩ
V

DD ≠VOUT1: IOUT1=1mA - - 2.0 V ①

Output 2 Characteristics Step-Up Controller

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

FB2 Voltage VFB2 VDD=3.0V, VIN=1.5V, IOUT2=10mA 0.882 0.900 0.918 V ⑧

Operation Start Voltage 2

Oscillation Start Voltage 2 VST2-2 FB2=0V - - 0.8 V ④

Maximum Duty Ratio 2 MAXDTY2 Same as IDD1 75 80 85 % ④

PFM Duty Ratio 2 PFMDTY2 No Load, VPWM2=0V 22 30 38 % ⑨

Efficiency 2 EFFI2 IOUT2=100mA, N-ch MOSFET: XP161A1355P - 83 - % ⑨

Soft-Start Time 2 TSS2 VOUT2×0.95V, EN2=0V→0.65V 5.0 10.0 20.0 ms ⑨

EXT2 "High" ON Resistance

EXT2 "Low" ON Resistance

PWM2 "High" Voltage VPWMH2 No Load 0.65 - - V ⑨

PWM2 "Low" Voltage VPWML2 No Load - - 0.20 V ⑨

Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=1.8V

(* 3)

VST1-2

REXTBH2 FB2=0, EXT2=VDD-0.4V - 28 47 Ω ⑦

REXTBL2 EN2=FB2=0V, EXT2=0.4V - 22 30 Ω ⑦

Using Tr: 2SD1628,
IOUT2=1.0mA, RFB21=200kΩ,RFB22=75kΩ
V

DD ≠ VOUT2 : IOUT2=1mA - - 2.0 V ①

(FOSC = 500kHz)

0.9 - - V ①

- 110 220 μA ④

- 130 270 μA ④

(FOSC = 500kHz)

- - 0.9 V ②

(FOSC = 500kHz)

- - 0.9 V ③

XC9501

Series

Ta=25℃

②

③

Ta=25℃

Ta=25℃

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XC9501 Series

■ELECTRICAL CHARACTERISTICS (Continued)

Notes:
* 1: Although the IC's step-up operations start from a VDD of 0.8V, the output voltage and switching frequency are
stabilized at V
other power sources.
* 2: Although the IC's switching operations start from a V
voltage monitor pin (FB1) should be connected to V
(output 2) EN2 pin should be set to disable. Once output voltage V
set to enable.
* 3: Although the IC's switching operations start from a V
voltage monitor pin (FB2) should be connected to V
(output 1 EN1 pin should be set to disable. Once output voltage V

to enable.
* 4: Please be careful not to exceed the breakdown voltage level of the external components. We recommend, as a
guideline, that a level equal to more than 3 times that of the set output voltage be used.
* 5: EFFI={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100

■TYPICAL APPLICATION CIRCUITS

① VDD=VOUT1 Connection Example

② VDD=VIN Connection Example

DD ≧2.0V. Therefore, a VDD of more than 2.0V is recommended when VDD is supplied from VIN or

IN of 0.9V, the IC's power supply pin (VDD) and output

OUT1. With operations from VIN=0.9V, the 2nd channel's

OUT1 is more than 2.0V, the EN2 pin should be

IN of 0.9V, the IC's power supply pin (VDD) and output

OUT2. With operations from VIN=0.9V, the 1st channel's

OUT2 is more than 2.0V, the EN1 pin should be set

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p

XC9501

Series

■OPERATIONAL EXPLANATION

The XC9501series are multi-functional, 2 channel step-up 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 Generator1, 2>
The ramp wave generator generates a saw-tooth waveform based on outputs from the Phase Shift Generator.

<PWM Comparator1, 2>
The PWM Comparator compares outputs from the error amp. and saw-tooth waveform. When the voltage from the error
am

's output is low, the external switch will be set to ON.

<PWM/PFM Controller1, 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 load. 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 applications, for examp le, where traditionally,
efficiencies have been sacrificed during stand-by as a result of using PWM control (due to the noise problems ass ociated
with the PFM mode in stand-by).

<Vref with Soft Start1, 2>
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please
refer to the notes on 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, however, 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.

<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 disable, the channel's operations will stop and the EXT pin will be kept at a low level (the external N-ch MOSFET
will be OFF). When both EN1 and EN2 are in a state of disable, current consumption will be no more than 3.0μA.
When the EN1 or EN2 pin's voltage is 0.65V or more, the mode will be enable and operations will recommence. With
soft-start, 95% of the set output voltage will be reached within 10mS (TYP.) from the moment of enable.
The start-up sequence for EN1 and EN2 is required when operations beg in with a power supply voltage of V

DD<2.0V or less.

Although IC 1 starts oscillation from a VIN of 0.9V, the IC's power supply pin (VDD) and the output voltage monitor pin (FB1)
should be connected to V
disable and turn it to enable when V
voltage monitor pin (FB2) are connected to V
V

OUT2 is more than 2.0V.

For power supply voltages of V

OUT1. When the IC starts operations from a VIN of 0.9V, set channel two's (output 2) EN2 pin to

OUT1 is more than 2.0V. Conversely, when IC 2' s power supply pin (VDD) and output

OUT2, set channel one's (output 1) EN1 pin to disable and turn it to enable when

DD<2.0V, oscillation may occur irrespective of the FB pin voltage. Should this hap pen, you

may find that output voltage will be higher than the set voltage. The FB pin voltage and the reference voltage Vref will be
compared and output voltage will be controlled when the power supply voltage is V
voltages of V

DD>2.0V, the start-up sequence for EN1 and EN2 will not be required.

DD>2.0V or more. With po wer supply

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