TOREX XC9505 User Manual

XC9505 Series

ETR0705_006b

2ch. Step-Down / Inverting DC/DC Controller IC

■GENERAL DESCRIPTION

XC9505 series are PWM controlled, PWM/PFM switching 2 channel (step-down and inverting) DC/DC controller ICs. With 0.9V of
internal standard voltage supply, and using externally connected components, the output 1 voltage (step-down DC/DC controller)
can be set freely within a range of 0.9V to 6.0V. Since output 2 (inverting DC/DC controller) has a built-in 0.9V reference voltage

±

(accuracy
With a 180 kHz frequency, the size of the external components can be reduced. Switching frequencies of 300 kHz and 500 kHz are
also available as custom designed products.
The control of the XC9505 series can be switched between PWM control and PWM/PFM automatic switching control using 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 of control selection so that control suited to the application can be selected. Soft-start time is internally set
to 10ms (output1) which offers protection against rush currents and voltage overshoot when the power is switched on.

2%), a negative voltage can be set with the external components.

■APPLICATIONS

●PDAs

●Palm top computers

●Digital cameras

●Various power supplies

■FEATURES

2 ch. DC/DC Controller
<Output 1: Step-Down DC/DC Controller>

Output Voltage Range : 0.9V ~ 6.0V (set by FB1 pin)
Output Current : More than 1000mA

Maximum Duty Cycle : 100%
Soft-Start Internally Set-Up

<Output 2: Inverting DC/DC Controller>

Output Voltage Range : -30V ~ 0V (set by FB2 pin)
Output Current : More than -100mA

Maximum Duty Cycle : 80% (TYP.)

<Common>

Operating Voltage Range : 2.0V ~ 10.0V
Oscillation Frequency : 180kHz (±15%)
* 300kHz, 500kHz custom

Control Method :

Stand-by Function : 3.0μA (MAX.)
Packages : MSOP-10, USP-10

Environmentally Friendly

■TYPICAL APPLICATION CIRCUIT

<XC9505B092A Input: 2 cell, VOUT: 3.3V, VOUT: - 5.0V >

L2:22uH

CDRH5D28

SD2

:MA2Q737

CL2:47uF

VOUT1:3.3V

CL1:47uF

RFB11

:200kΩ

R
:75kΩ

L1:22uH

CDRH5D28

FB1

C

:62pF

FB12

SD1

:MA2Q737

Tr1:Pch MOSFET

XP162A12A6P

1 EXT1/

2 VDD

3 FB1 FB2 8

4 PWM1 PWM2 7

VPWM1 VPWM2

5 EN1 EN2 6

=5.0V

V

IN

EXT2/ 10

GND 9

Tr2:Pch MOSFET

IN

C

:47uF

XP162A12A6P

VNE2VNE1

V

OUT2:-5.0V

RFB21
:27kΩ

FB22

R
:11kΩ

■TYPICAL PERFORMANCE

CHARACTERISTICS

●Efficiency vs. Output Current

FB2

C
:62pF

☆GreenOperation-Compatible

(Step-Down / Inverting)

(V

IN=5.0V, VOUT=3.3V)

(V

IN=5.0V, VOUT= - 3.3V)

PWM or PWM/PFM Selectable

: EU RoHS Compliant, Pb Free

1/50

XC9505 Series

■PIN CONFIGURATION

■PIN ASSIGNMENT

PIN NUMBER PIN NAME FUNCTIONS

■PRODUCT CLASSIFICATION

●Ordering Information

XC9505①②③④⑤⑥-⑦

MARK ITEM SYMBOL DESCRIPTION

⑤⑥-⑦

(*1)

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

1 EXT1

2 VDD

3 FB1 FB2 8

4 PWM1 PW M2 7

5 CE1 CE2 6

EN1

MSOP-10

EXT2 10

GND 9

EN2

USP-10

(BOTTOM VIEW)

(TOP 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>

①

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

②③

④

Oscillation Frequency

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

OUT1 and Ground.>

Channel 1: PWM/PFM Switching Pin <Control Output 1. PWM control when connected to
V

DD, 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 V

DD 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 V

DD when Output 2 is active. EXT2/ is high when in stand-by mode.>

Channel 2: PWM/PFM Switching Pin <Control Output 2. PWM control when connected to
V

DD, 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)

Output Voltage 09

FB products→②=0, ③=9 fixed

OUT2 and VOUT1.>

2 180kHz

3 300kHz (custom)

5 500kHz (custom)

AR MSOP-10 (1,000/Reel)

Packages

(Oder Unit)

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

DR USP-10 (3,000/Reel)

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

2/50

A

■BLOCK DIAGRAM

EXT1

VDD

FB1

PWM1

+

-

Error Amp1

CE1

EN1

Vref1=0.9V

with Soft Sta rt1,

EN1

BSOLUTE MAXIMUM RATINGS

■

PARA METE R SYMBOL RATINGS UNITS

VDD Pin Voltage VDD - 0.3 ~ 12.0 V

PWM/PFM

Controller1

-

+

Ramp Wave

Generator1

to

EN1

internal circuit

PWM

Comparator1

OSC

Gene rator

PWM/PFM
Controller2

-

Ramp Wave

Generator2

internal circuit

Comparator2

+

EN2

to

PWM

+

Error Amp2

Vref2=0.9V,

XC9505

Series

EXT2 /

GND

FB2

PWM2

CE2

EN

-

EN2

Ta =2 5℃

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 ± 100 mA

MSOP-10 150

Power Dissipation

USP-10

Operating Temperature Range Topr - 40 ~ + 85

Storage Temperature Range Tstg - 55 ~ + 125

Pd

150

mW

℃

℃

3/50

XC9505 Series

■ELECTRICAL CHARACTERISTICS

XC9505B092A Common Characteristics Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage VDD 2.0 - 10.0 V -

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

Supply Current 1 IDD1 FB=0V, FB2=1.2V
Supply Current 1-1 IDD1-1
Supply Current 1-2 IDD1-2
Supply Current 1-3 IDD1-3
Supply Current 1-4 IDD1-4

EN1=3.0V, EN2=0, FB1=0V
EN2=3.0V, EN1=0, FB2=1.2V
FB1=0V, FB2=0V

FB1=1.2V, FB2=1.2V
Supply Current 2 IDD2 FB1=1.2V, FB2=0V
Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - 1.0 3.0

Oscillation Frequency f

Same as IDD1 153 180 207 kHz

OSC

EN1, 2 "High" Voltage VENH FB1=0V, FB2=3.0V 0.65 - - V
EN1, 2 "Low" Voltage VENL FB1=0V, FB2=3.0V - - 0.20 V

EN1, 2 "High" Current IENH FB1=3.0V, FB2=0V - - 0.50

EN1, 2 "Low" Current IENL EN1, 2=0V, FB1=3.0V, FB2=0V - - -0.50

PWM1, 2 "High" Current IPWMH FB1=3.0V, FB2=0V, PWM1, 2=3.0V - - 0.50

PWM1, 2 "Low" Current IPWML FB1=3.0V, FB2=0V, PWM1, 2=0V - - -0.50

FB1, 2 "High" Current IFBH FB1=3.0V, FB2=0.8V - - 0.50

FB1, 2 "Low" Current

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

Output 1 Characteristics Step-Down Controller Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

FBL FB1=1.0V, FB2=0V - - -0.50

V

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

Minimum Operating Voltage

Maximum Duty Ratio1

Minimum Duty Ratio1

PFM Duty Ratio1

Efficiency1 (*2) EFFI1

Soft-Start Time1 t

EXT1 "High"

ON Resistance

EXT1 "Low"

ON Resistance

VINmin1 - - 2.0 V

MINDTY1
MAXDTY1
PFMDTY1

Same as IDD1 100 - - %
Same as IDD2 - - 0 %
No Load, VPWM1=0V 22 30 38 %

OUT1= 250mA, Pch MOSFET:

I
XP162A12A6P

OUT1×0.95V, EN1=0V→0.65V 5.0 10.0 20.0 ms ④

V

SS1

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

REXTBL1 EN1=FB1=1.2V, EXT1=0.4V - 22 30

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

Unless otherwise stated, V

Output 2 Characteristics Inverting DC/DC Controller Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

DD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V

PWML1 No Load - - 0.20 V

V

FB2 Voltage VFB2 VDD=3.0V 0.882

IOUT2=1.0mA, RFB11=200kΩ,

Operation Start Voltage2

ST1-2

V

RFB12=75kΩ
RFB21=17.5kΩ, RFB22=10kΩ,
EN1=PWM1=3.0V

Oscillation Start Voltage2 VST2-2 FB2=1.2V - - 2.0 V

Maximum Duty Ratio2

Minimum Duty Ratio2

PFM Duty Ratio2

Efficiency2 (*2) EFFI2

EXT2 "High"

ON Resistance

EXT2 "Low" ON Resistance

MAXDTY2

MINDTY3
PFMDTY2

Same as IDD1 75 80 87 %
Same as IDD2 - - 0 %
No Load, VPWM2=0V 22 30 38 %
I

OUT2

= -150mA, Pch MOSFET: XP162A12A6P

REXTBH2 EN2=FB2= 0V, EXT2=VDD-0.4V - 28 47

REXTBL2 FB2=3.0V, EXT2=0.4V - 22 30

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

PWM2 "Low" Voltage

Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=3.0V
NOTE: *1: Please be careful not to exceed the breakdown voltage level of the peripheral parts.

*2: EFFI1, 2={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100

PWML2 No Load - - 0.20 V

V

VOUT1 0.9 - VIN
V

OUT2 - - 0.0

- 80 160

- 50 110

- 60 120

- 70 120

- 80 150

- 70 130

0.900

0.918 V

- 92 - % ④

0.900

0.918 V

- - 2.0 V

- 76 - %

V ①

μA
μA
μA
μA
μA
μA
μA

μA
μA
μA
μA
μA
μA

CIRCUIT

Ω ⑤

Ω ⑤

CIRCUIT

Ω ⑤

Ω ⑤

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4/50

XC9505

■ELECTRICAL CHARACTERISTICS (Continued)

XC9505B093A Common Characteristics Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage VDD 2.0 - 10.0 V

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

Supply Current 1 IDD1 FB=0V, FB2=1.2V
Supply Current 1-1 IDD1-1
Supply Current 1-2 IDD1-2
Supply Current 1-3 IDD1-3
Supply Current 1-4 IDD1-4

EN1=3.0V, EN2=0, FB1=0V
EN2=3.0V, EN1=0, FB2=1.2V
FB1=0V, FB2=0V

FB1=1.2V, FB2=1.2V
Supply Current 2 IDD2 FB1=1.2V, FB2=0V
Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - 1.0 3.0

Oscillation Frequency f

Same as IDD1 255 300 345 kHz

OSC

EN1, 2 "High" Voltage VENH FB1=0V, FB2=3.0V 0.65 - - V
EN1, 2 "Low" Voltage VENL FB1=0V, FB2=3.0V - - 0.20 V

EN1, 2 "High" Current IENH FB1=3.0V, FB2=0V - - 0.50

EN1, 2 "Low" Current IENL EN1, 2=0V, FB1=3.0V, FB2=0V - - -0.50

PWM1, 2 "High" Current IPWMH FB1=3.0V, FB2=0V, PWM1, 2=3.0V - - 0.50

PWM1, 2 "Low" Current IPWML FB1=3.0V, FB2=0V, PWM1, 2=0V - - -0.50

FB1, 2 "High" Current IFBH FB1=3.0V, FB2=0.8V - - 0.50

FB1, 2 "Low" Current

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

Output 1 Characteristics Step-Down Controller Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

FBL FB1=1.0V, FB2=0V - - -0.50

V

FB1 Voltage VFB1 VDD=3.0V, VIN=1.5V, IOUT1=10mA

Minimum Operating Voltage

Maximum Duty Ratio1

Minimum Duty Ratio1

PFM Duty Ratio1

Efficiency1 (*2) EFFI1

Soft-Start Time1 t

EXT1 "High"

ON Resistance

EXT1 "Low" ON Resistance

VINmin1

MINDTY1
MAXDTY2
PFMDTY1

SS1

Same as IDD1
Same as IDD2
No Load, VPWM1=0V
I

OUT1

= 250mA, Pch MOSFET: XP162A12A6P

VOUT1×0.95V, EN1=0V→0.65V

REXTBH1 FB1=0V, EXT1=VDD -0.4V

REXTBL1 EN1=FB1=1.2V, EXT1=0.4V
PWM1 "High" Voltage VPWMH1 No Load
PWM1 "Low" Voltage

Unless otherwise stated, V

Output 2 Characteristics Inverting DC/DC Controller Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

V

PWML1 No Load

DD=EN1=PWM1=3.0V, EN2=PWM2=GND, EXT2=OPEN, FB2=OPEN, VIN=1.8V

FB2 Voltage VFB2 VDD=3.0V 0.882

I

OUT2=1.0mA, RFB11=200kΩ,

Operation Start Voltage2

V

ST1-2

RFB12=75kΩ
RFB21=17.5kΩ, RFB22=10kΩ,
EN1=PWM1=3.0V

Oscillation Start Voltage2 VST2-2 FB2=1.2V - - 2.0 V

Maximum Duty Ratio2

Minimum Duty Ratio2

PFM Duty Ratio2

Efficiency2 (*2) EFFI2

EXT2 "High"

ON Resistance

EXT2 "Low" ON Resistance

MAXDTY2

MINDTY3

PFMDTY2

Same as IDD1 75 80 87 %
Same as IDD2 - - 0 %
No Load, VPWM2=0V 22 30 38 %
I

OUT2

= -150mA, Pch MOSFET: XP162A12A6P

REXTBH2 EN2=FB2= 0V, EXT2=VDD-0.4V - 28 47

REXTBL2 FB2=3.0V, EXT2=0.4V - 22 30

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

PWM2 "Low" Voltage

Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=3.0V
NOTE: *1: Please be careful not to exceed the breakdown voltage level of the peripheral parts.

*2: EFFI1, 2={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100

PWML2 No Load - - 0.20 V

V

VOUT1 0.9 - VIN
VOUT2 - - 0.0

- 100 190

- 60 120

- 80 150

- 80 140

- 100 180

- 80 150

0.882

0.900

0.918 V

- - 2.0 V

- - 100 %

- - - %

22 30 38 %

- 92 - %

5.0 10.0 20.0 ms

- 28 47

- 22 30

0.65 - - V

- - 0.20 V

0.900

0.918 V

- - 2.0 V

- 75 - %

V ①

μA
μA
μA
μA
μA
μA
μA

μA
μA
μA
μA
μA
μA

CIRCUIT

Ω ⑤
Ω ⑤

CIRCUIT

Ω ⑤

Ω ⑤

Series

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5/50

XC9505 Series

■ELECTRICAL CHARACTERISTICS (Continued)

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS CIRCUIT

Supply Voltage VDD 2.0 - 10.0 V -

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

Supply Current 1 IDD1 FB=0V, FB2=1.2V
Supply Current 1-1 IDD1-1
Supply Current 1-2 IDD1-2
Supply Current 1-3 IDD1-3
Supply Current 1-4 IDD1-4

EN1=3.0V, EN2=0, FB1=0V
EN2=3.0V, EN1=0, FB2=1.2V
FB1=0V, FB2=0V

FB1=1.2V, FB2=1.2V
Supply Current 2 IDD2 FB1=1.2V, FB2=0V
Stand-by Current ISTB Same as IDD1, EN1=EN2=0V - 1.0 3.0

Oscillation Frequency f

Same as IDD1 425 500 575 kHz

OSC

VOUT1 0.9 - VIN
VOUT2 - - 0.0

- 130 250

- 80 150

- 110 220

- 100 170

- 140 230

- 100 190

V ①

μA
μA
μA
μA
μA
μA
μA

EN1, 2 "High" Voltage VENH FB1=0V, FB2=3.0V 0.65 - - V
EN1, 2 "Low" Voltage VENL FB1=0V, FB2=3.0V - - 0.20 V

EN1, 2 "High" Current IENH FB1=3.0V, FB2=0V - - 0.50

EN1, 2 "Low" Current IENL EN1, 2=0V, FB1=3.0V, FB2=0V - - -0.50

PWM1, 2 "High" Current IPWMH FB1=3.0V, FB2=0V, PWM1, 2=3.0V - - 0.50

PWM1, 2 "Low" Current IPWML FB1=3.0V, FB2=0V, PWM1, 2=0V - - -0.50

FB1, 2 "High" Current IFBH FB1=3.0V, FB2=0.8V - - 0.50

FB1, 2 "Low" Current

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

Output 1 Characteristics Step-Down Controller Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

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

FBL FB1=1.0V, FB2=0V - - -0.50

V

0.900

0.918 V

μA
μA
μA
μA
μA
μA

Minimum Operating Voltage VINmin1 - - 2.0 V

Maximum Duty Ratio1

Minimum Duty Ratio1

PFM Duty Ratio1

Efficiency1 (*2) EFFI1

Soft-Start Time1 t

EXT1 "High" ON Resistance

EXT1 "Low" ON Resistance

MINDTY1
MAXDTY2
PFMDTY1

SS1

Same as IDD1 - - 100 %
Same as IDD2 - - 0 %
No Load, VPWM1=0V 22 30 38 %
I

OUT1

= 250mA, P-ch MOSFET: XP162A12A6P

OUT1×0.95V, EN1=0V→0.65V

V

- 91 - %

5.0 10.0 20.0 ms
REXTBH1 FB1=0V, EXT1=VDD -0.4V - 28 47
REXTBL1 EN1=FB1=1.2V, EXT1=0.4V - 22 30

Ω ⑤
Ω ⑤

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

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

Output 2 Characteristics Inverting DC/DC Controller Ta=25℃

PARAMETER SYMBOL CONDITIONS MIN. TYP. MAX. UNITS

FB2 Voltage VFB2 VDD=3.0V 0.882

Operation Start Voltage2 VST1-2

PWML1 No Load - - 0.20 V

V

OUT2=1.0mA, RFB11=200kΩ,

I
RFB12=75kΩ
RFB21=17.5kΩ, RFB22=10kΩ,
EN1=PWM1=3.0V

0.900

- - 2.0 V

0.918 V

Oscillation Start Voltage2 VST2-2 FB2=1.2V - - 2.0 V

Maximum Duty Ratio2

Minimum Duty Ratio2

PFM Duty Ratio2

Efficiency2 (*2) EFFI2

EXT2 "High"

ON Resistance

EXT2 "Low" ON Resistance

MAXDTY2

MINDTY3

PFMDTY2

REXTBH2 EN2=FB2= 0V, EXT2=VDD-0.4V - 28 47

REXTBL2 FB2=3.0V, EXT2=0.4V - 22 30

Same as IDD1 75 80 87 %
Same as IDD2 - - 0 %
No Load, VPWM2=0V 22 30 38 %
I

OUT2

= -150mA, P-ch MOSFET: XP162A12A6P

- 71 - %

Ω ⑤

Ω ⑤

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

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

Unless otherwise stated, V
NOTE: *1: Please be careful not to exceed the breakdown voltage level of the peripheral parts.

*2: EFFI1, 2={ [ (output voltage) x (output current) ] / [ (input voltage) x (input current) ] } x 100

DD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=3.0V

=

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CIRCUIT

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CIRCUIT

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6/50

XC9505

■OPERATIONAL DESCRIPTION

The XC9505 series are dual DC/DC (step-down + inverting) converter controller ICs with built-in high speed, low ON
resistance buffers.

<Error Amp. 1>
Error amplifier 1 is designed to monitor the output voltage and it compares the feedback voltage 1 (FB1) with the reference
voltage Vref1. In response to feedback of a voltage lower than the reference voltage Vref1, the output voltage of the error
amp. decreases.

<Error Amp. 2>
Error amplifier 2 is designed to monitor the output voltage and it compares the feedback voltage 2 (FB2) with the reference
voltage Vref 2. In response to feedback of a voltage lower than the reference voltage Vref2, the output voltage of the
error amp. decreases.

<OSC Generator>
This circuit generates the internal reference clock.

<Ramp Wave Generator 1, 2>
The ramp wave generator generates a saw-tooth waveform based on outputs from the OSC 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 external signals.
The PFM/PWM 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
example, where traditionally, 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 1 with Soft Start 1>
The reference voltage, Vref1 (FB1 pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings,
please refer to the functional settings 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
input to error amp 1, the operation maintains a balance between the two inputs of error amps and controls the EXT pin's
ON time so that it doesn't increase more than is necessary.

<Vref 2>
The reference voltage, Vref2 (FB2 pin voltage)=0.9V, is adjusted and fixed by laser trimming.

<Enable Function 1,2>
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 EXT1 and the EXT2 pin will be kept at a high level (the
external 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 3.0μA. When the EN1 or EN2 pin's voltage is 0.65V or more, the mode will be enable and operations will
recommence. With channel one (output 1) soft-start, 95% of the set output voltage will be reached within 10ms (TYP.)
from the moment of enable.

L) from inrush current. With the Vref voltage limited, and depending upon the

Series

7/50

XC9505 Series

■OPERATING EXPLANATION

< Output Voltage Setting, Ch.1 (Step-up DC/DC Converter Controller) >
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation,
based on the values of R

The speed-up capacitor for phase compensation's (C

fzfb=1/(2

capacity value C
[Calculation Example]

When RFB11=200kΩ and RFB12=75k

[Typical Example]

×π×

CFB1×RFB11) so that it equals 12kHz. Depending on the application, the inductance value L, and the load

, adjustments to this value are suggested so that the value is somewhere between 1kHz to 50kHz.

L

VOUT

(V)

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

< Output Voltage Setting, Ch.2 (Inverting DC/DC Converter) >
Output voltage can be set by adding reference voltage and split resistors externally. Output voltage is determined using
the following equation and is based on the values of R
500kΩ or less. The equation uses Ch 1's (VOUT1) output voltage calculation method for the reference voltage.

[Calculation Example]

When RFB21=17.5kΩ RFB22=10k

The value of speed-up capacitor for phase compensation CFB21:

[Conditions: Heavy load (when coil current is continuous.)]

fzfb2 = 1/2 x

Depending on the application, the inductance value L, and the load capacity value C
suggested so that the value is somewhere between 0.1kHz to 50kHz.

[Conditions: Light load (when coil current is discontinuous.)]

Less than C
Depending on the application, the inductance value L, and the load capacity value C
suggested.

> Example Circuit 1: Using voltage of Ch 1 (Step-Down)

> Example Circuit 2: Using a positive regulator

π

x CFB21 x RFB21) = 10kHz

FB21=0.1μF

FB11 and RFB12. The sum of RFB11 and RFB12 should normally be 1MΩ or less.

VOUT1=0.9 × (RFB11+RFB12) / RFB12

FB1) value should be adjusted using the formula

Ω :

VOUT1=0.9 × (200k+75k) / 75k=3.3V.

RFB11

(kΩ)

RFB12

(kΩ)

V

Ω,

VOUT1=3.3V, VOUT2= - 3.3V

CFB1

(pF)

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

VOUT

(V)

FB21 and RFB22. The sum of RFB21 and RFB22 should normally be

RFB11

(kΩ)

RFB12

(kΩ)

CFB1

(pF)

, adjustments to this value are

L

, adjustments to this value are

L

Channel 1 (Step-Down) circuits should be enabled by
setting EN1 to High level so that a stable voltage is
provided. Inrush current to the inverter when the supply
voltage V
setting EN 1 and EN 2 to enable (“H” level) simultaneously.

DD of the IC is 2.0 V or higher can be controlled by

A stable positive voltage produced by a positive-voltage
regulator or by other means is usable.

V

OUT2 = (0.9 - VROUT) x (RFB21 / RFB22) + 0.9V

8/50

XC9505

■EXTERNAL COMPONENTS

Conditions: Light load (when coil current is discontinuous)

Channel One (Step-Down DC/DC Converter Controller) Channel Two (Inverter DC/DC Controller)

Tr 1 : * MOSFET Tr 2 : * MOSFET

XP152A12C0

(P-ch Power MOSFET, TOREX)

Note; VGS Breakdown Voltage of this Tr. is 12V so

please be careful with the power supply voltage.
SD 1 :
L1 :
D412F, TOKO, f

D412F, TOKO, f

D412F, TOKO, f

CRS02 (Schottky, TOSHIBA) SD 2 : CRS02 (Schottky, TOSHIBA)

10μH

15μH

22μH

(CDRH4D18C, SUMIDA, L2 :

= 500kHz) D412F, TOKO, f

OSC

(CDRH4D18C, SUMIDA,

= 300kHz) D412F, TOKO, F

OSC

(CDRH4D18C, SUMIDA,

= 180kHz) D412F, TOKO, f

OSC

Please set so that the coil current is discontinuous. Please set so that the coil current is discontinuous.
C

L1 :

10V, 4.7μF

(Ceramic) CL2 :

*PNP Tr

2SA1213 (TOSHIBA) 2SA1213

R

B1 :

B1 : 2200pF

C

500Ω

Adjust in accordance with load &
Tr.'s h

FE

B1

≦

(VIN-0.7) x (hFE/IC-REXTBL)

R

(Ceramic)

C

B1

≦

(2π x RB1 x f

OSC

x 0.7)

Conditions: Heavy load (when coil current is continuo us)
Channel One (Step-Down DC/DC Converter Controller) Channel Two (Inverter DC/DC Controller)

Tr 1 : * MOSFET Tr 2 : * MOSFET

XP162A12A6P (P-ch Power MOSFET, TOREX) XP162A12A6P (P-ch Power MOSFET, TOREX)

Note: V

GS Breakdown Voltage of this Tr. is 12V so

please be careful with the power supply voltage.
SD
1 : MA2Q737 (Schottky, MATSUSHITA)
L1 :

CMS02 (Schottky, TOSHIBA)

CL1 :

10μH

22μH

47μH

16V, 47μF

CL=(CL standard value ) x (IOUT1 (mA)/500mA x VOUT1/VIN)

*PNP Tr

(CDRH5D28, SUMIDA,

f

= 500kHz)

OSC

(CDRH5D28, SUMIDA,

f

= 300kHz)

OSC

(CDRH5D28, SUMIDA,

= 180kHz)

f

OSC

(Tantalum) CL2 :

2SA1213 (TOSHIBA) 2SA1213 (TOSHIBA)
R

B1 :

500Ω

B1 : 2200pF (Ceramic) CB2 : 2200pF (Ceramic)

C

Adjust in accordance with load &
Tr.'s h

FE

RB1≦(VIN-0.7) x (hFE/IC-REXTBL)

CB1≦(2π x RB2 x f

OSC

x 0.7)

XP152A12C0

(P-ch Power MOSFET, TOREX)

Note: VGS Breakdown Voltage of this Tr. is 12V so

please be careful with the power supply voltage.

10μH

15μH

22μH

10V, 4.7μF

*PNP Tr

(CDRH4D18C, SUMIDA,

= 500kHz)

OSC

(CDRH4D18C, SUMIDA,

= 300kHz)

OSC

(CDRH4D18C, SUMIDA,

= 180kHz)

OSC

(Ceramic)

(TOSHIBA)

RB2 :

500Ω

CB2 : 2200pF

Adjust in accordance with load &
Tr.'s h

FE

RB2≦(VIN-0.7) x (hFE/IC-REXTBL)

(Ceramic)

CB2≦(2π x RB2 x f

OSC

x 0.7)

Note: VGS Breakdown Voltage of this Tr. is 12V so

please be careful with the power supply voltage.

SD 2 :

MA2Q737 (Schottky, MATSUSHITA)

L2 : CRS02,

CMS02

10μH

15μH

22μH
16V, 47μF

CL=(CL standard value ) x (IOUT2 (mA)/150mA x VOUT2/VIN)

*PNP Tr

B2 :

R

500Ω

(Schottky, TOSHIBA)

(CDRH5D28, SUMIDA,

f

= 500kHz)

OSC

(CDRH5D28, SUMIDA,

f

= 300kHz)

OSC

(CDRH5D28, SUMIDA,

= 180kHz)

f

OSC

(Tantalum)

Adjust in accordance with load &
Tr.'s h

FE

RB2≦(VIN-0.7) x (hFE/IC-REXTBL)

CB2≦(2π x RB2 x f

OSC

x 0.7)

Series

9/50

A

pp

XC9505 Series

■NOTES ON USE

●

1. Channel 2 (Inverting) Soft start circuit

2. Channel 2 (Inverting) Withstand voltage of transistor

lication Hint

Channel 2 (inverting) is subject to the overshoot of output voltage 2 (VOUT2) at start-up. It is possible to control the
overshoot of output voltage 2 (V
“Function Settings.” In this circuit configuration, EN 1 and EN 2 are enabled simultaneously. This lets output voltage 1

OUT1) of channel 1 increase gently as soft start, thereby controlling the overshoot.

(V

> Example of Typical application circuit: Improved Soft start
This example is effective when EN 1 and EN 2 are enabled with different timings under light load condition (the coil current
being discontinuous).

Insi de o f
XC9505 IC

FB2

EN2

SBD2

VOUT1

R1

MOSFET2

ON/OFF
signal

MOSFET1

Nch

Pch

The voltage applied between the drain and source is the sum of V
Select a transistor with an absolute V
Example: The voltage applied across V
Under this condition, a transistor with V
times the applied voltage or more, as a standard.)

OUT2), as shown by circuit example 1 in “Output Voltage Settings for Channel 2” in

Time to make soft start time t

RFB22

CL2

CFB21

RFB21

VOUT2

DSS rating that is suitable for your operating conditions.

DS of a transistor will be 20.0V if VIN = 5.0 V and VOUT 2 = -15.0 V.
DSS higher than 20.0V should be selected. (Use a transistor with VDSS that is 1.5

Time

SS2 =-RFB2 1xCCFB21

Example)
When V

OUT1 = 3.3V and VOUT2 = - 7.5V,

RFB21 = 350kΩ, RFB22 = 100kΩ by the equation below.

V

OUT2 = (0.9 - VOUT1) x (RFB21 / RFB22) + 0.9

When the light load, C
Therefore, when C
t

= 5.0ms and VOUT2 = 95% of setting value

SS2

IN and VOUT 2.

FB21=0.1μF or lower value can be used.

FB21=0.027μF,

is calculated by the equation below.

SS2

/Ln 1-

(0.9 - V

(V

OUT1

)xR

OUT2

-0.9)xR

FB2 2

FB2 1

)

10/50

■TEST CIRCUITS

Circuit ① Circuit ④

Circuit ② Circuit ⑤

Circuit ⑥ Circuit ③

XC9505

Series

11/50

XC9505 Series

■EXTERNAL COMPONENTS OF TEST CIRCUITS

Circuit ①

L1, L2:

SD1, SD2 : CRS02 (Schottky, TOSHIBA)

CL1, CL2 : 16MCE476MD2 (Tantalum, NIHON CHEMICON)

PNP Tr 1 : 2SA1213 (TOSHIBA)
PNP Tr 2 : 2SA1213 (TOSHIBA)

Circuit ③

SD 1 : MA2Q737 (Schottky, MATSUSHITA)

Pch MOSFET : XP162A12A6P (TOREX)

Circuit ④

SD 1 : MA2Q737 (Schottky, MATSUSHITA)

Pch MOSFET : XP162A12A6P (TOREX)

Circuit ⑥

SD 2 : MA2Q737 (Schottky, MATSUSHITA)

Pch MOSFET : XP162A12A6P (TOREX)

22μH (CDRH5D28, SUMIDA) : XC9505B092A
15μH (CDRH5D28, SUMIDA) : XC9505B093A
10μH (CDRH5D28, SUMIDA) : XC9505B095A

EC10QS06 (Schottky, NIHON INTER)

35MCE335MB x 3 (Tantalum, NIHON CHEMICON)

C

IN : 16MCE476MD2

R

FB : Please use by the conditions as below.

RFB11 + RFB12≦1MΩ

FB21 + RFB22

R
RFB11 / RFB12 = (Setting Output Voltage / 0.9) - 1

OUT2 = (0.9 - VOUT1) / (RFB21 / RFB22) + 0.9V

V

FB :

C

fzfb = 1 /(2 x
fzfb = 1 /(2 x

≦1MΩ

π
π

x CFB1 x RFB11) = 1kHz to 50kHz (12kHz usual)
x CFB2 x RFB21) = 1kHz to 50kHz (12kHz usual).

L1 :

22μH (SUMIDA CDRH5D28)

CL1 : 16MCE476MD2 (Tantalum, NIHONCHEMICON)
C

IN : 16MCE476MD2 (Tantalum, NIHONCHEMICON)

L1 :

22μH (CDRH5D28, SUMIDA) : XC9505B092A
15μH (CDRH5D28, SUMIDA) : XC9505B093A
10μH (CDRH5D28, SUMIDA) : XC9505B095A

L1 : 16MCE476MD2 (Tantalum, NIHONCHEMICON)

C

IN : 16MCE476MD2 (Tantalum, NIHONCHEMICON)

C

L2 :

22μH (CDRH5D28, SUMIDA) : XC9505B092A
15μH (CDRH5D28, SUMIDA) : XC9505B093A
10μH (CDRH5D28, SUMIDA) : XC9505B095A

L2 : 16MCE476MD2 (Tantalum, NIHONCHEMICON)

C

C

IN : 16MCE476MD2 (Tantalum, NIHONCHEMICON)

12/50

XC9505

1. Checking for Intermittent Oscillation
The XC9505 series is subject to intermittent oscillation in the proximity of the maximum duty cycle if the step-down ratio is
low (e.g., from 4.2 V to 3.3 V) or a heavy load is applied where the duty ratio becomes high. Check waveforms at EXT
under your operating conditions. A remedy for this problem is to raise the inductance of coil L or increase the load
capacitance C

2. PWM/PFM Automatic Switching
If PWM/PFM automatic switching control is selected and the step-down ratio is high (e.g., from 10.0 V to 1.0 V), the control
mode remains in PFM setting over the whole load range, since the duty ratio under continuous-duty condition is smaller
than the PFM duty ratio of the XC9505 series. The output voltage's ripple voltage becomes substantially high under
heavy load conditions, with the XC9505 series appearing to be producing an abnormal oscillation. If this operation
becomes a concern, set pins PWM to High to set the control mode to PWM setting. For use under the above-mentioned
condition, measured data of PWM/PFM automatic switching control shown on the data sheets are available up to I
100 mA.

3. Ratings
Use the XC9505 series and peripheral components within the limits of their ratings.

.

L

Series

OUT =

13/50

,

,

XC9505 Series

■TYPICAL PERFORMANCE CHARACTERISTICS

< 1 ch Step-Down DC/DC Controller >

(1) Output Voltage vs. Output Current

f

1.2

FOSC=180kHz, V

PWM Contr ol

=180kHz, V

OSC

L1=47μH(CDRH6D38), CL1=94μF(Tantalum)

OUT1

OUT1

SD1:C MS02

=1.0V

=1.0V

Tr1:XP162A12A6P

f

FOSC=180kHz, V

1.2

PWM /PFM Swi tching Contr ol

OSC

=180kHz, V

L1=47μH(CDRH6D38), CL1=94μF(Tantalum)

=1.0V

OUT1

=1.0V

OUT1

SD1:C MS02, Tr1:XP162A12A6P

1.1

(V)

OUT1

1.0

0.9

VIN=2.7V 3.3V 4.2V

Output Voltage1 V

0.8

0.7

0.1 1 10 100 1000

3.5

PWM /PFM Switc hing Contr ol
PWM Contr ol

3.4

(V)

OUT1

3.3

3.2

Output Voltage1 V

3.1

Output Cur rent1 I

f

=180kHz, V

OSC

FOSC=180kHz, V

L1=47μH(CDRH6D38), CL1=94μF(Tantal um)

5.0V 6.0V 8.0V

OUT1

SD1:C MS02, Tr 1:XP162A12A6P

VIN=4.2V 5.0V 6.0V 8.0V 10V

OUT1

OUT1

10V

(mA)

=3.3V

=3.3V

1.1

(V)

OUT1

1.0

0.9

Output Voltage1 V

0.8

0.7

0.1 1 10 100 1000

Output Cur rent1 I

f

=180kHz, V

OSC

FOSC=180kHz, V

L1=47μH(CDRH6D38), CL1=94μF(Tantalum)

5.2

PWM /PFM Swit ching Cont rol
PWM Contr ol

5.1

(V)

OUT1

5.0

4.9

Output Voltage1 V

4.8

10V

4.2V 5.0V 6.0V 8.0V

VIN=2.7V 3.3V

(mA)

OUT1

=5.5V

OUT1

=5.0V

OUT1

SD1:C MS02

VIN= 6.0V 8.0V 10V

Tr1:XP162A12A6P

3.0

0.1 1 10 100 1000

Output Cur rent1 I

f

=300kHz, V

OSC

FOSC=300kHz, V

L1=22μH(CDRH5D28), CL1=94μF(Tantalum)

1.2

PWM Contr ol

1.1

(V)

OUT1

1.0

0.9

Output Voltage1 V

0.8

0.7

0.1 1 10 100 1000

VIN=2.7V 3.3V 4.2V 5.0V

6.0V 8.0V 10V

Output Cur rent1 I

(mA)

OUT1

=1.0V f

OUT1

=1.0V

OUT1

SD1:C MS02, Tr1:XP162A12A6P

(mA)

OUT1

4.7

0.1 1 10 100 1000

Output Current1 I

=300kHz, V

OSC

FOCS=300kHz, V

L1=22μH(CDRH5D28), CL1=94μF(Tantalum)

1.2

PWM /PFM Switc hing Contr ol

1.1

(V)

OUT1

1.0

0.9

Output Voltage1 V

0.8

0.7

0.1 1 10 100 1000

4.2V 6.0V 8.0V 10V

Output Current1 I

OUT1

OUT1

OUT1

SD1:C MS02, Tr1:XP162A12A6P

VIN=2.7V 3.3V

5.0V

OUT1

* When setting VOUT1=1.0V, VIN=8.0V or 10.0V,

C

L=94μF (Tantalum) + 100μF (OS Capacitor)

(mA)

=1.0V

=1.0V

(mA)

14/50

■TYPICAL PERFORMANCE CHARACTERISTICS (Continued)

< 1 ch Step-Down DC/DC Controller > (Continued)

(1) Output Voltage vs. Output Current (Continued)

f

=300kHz, V

OSC

=1.8V f

OUT1

=300kHz, V

OSC

OUT1

=1.8V

XC9505

Series

f

=300kHz, V

OSC

f

OSC

OUT1

=300kHz, V

=2.5V

OUT1

=3.3V

f

=300kHz, V

OSC

f

=300kHz, V

OSC

OUT1

OUT1

=2.5V

=3.3V

* When setting VOUT1=1.0V, VIN=8.0V or 10.0V

C

L=94μF (Tantalum) + 100μF (OS Capacitor)

15/50