Mar. 14, 2003 Ver. 2
Applications
2ch DC/DC Controller (Step-down + Step-down)
PDAs
Input Voltage Range 2.0V ~ 10.0V
Palm Top Computers
Output Voltage Externally Set-Up
Digital Cameras
Switching Frequency 300kHz (15%)
Various Multi-Function Power Supplies
Maximum Duty Cycle
100%
PWM, PWM/PFM Switching Control
Features
High Efficiency
Step-down 92% (Typ.)
Input Voltage Range
: 2.0V ~ 10V
Small MSOP-10 package
Power Supply Voltage Range : 2.0V ~ 10V
Output Voltage Range
: 0.9V ~ 6.0V
General Description
Oscillation Frequency
: 300kHz
15%
(180kHz, 500kHz custom)
Output Current
Stand-By Function
: 3.0
A (MAX.)
Package
: MSOP-10
Soft-Start Time
: 10 ms (internally set)
Typical Performance Characteristics
Typical Application Circuit
XC9503B093A Input :
VOUT
1
: 3.3V, VOUT
2
: 1.8V
: more than 1000mA (VIN=5.0V, VOUT=3.3V)
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.
XC9503 Series
2ch. Step-down DC/DC Controller ICs
The XC9503 series are PWM controlled, PWM/PFM automatic
switching controlled, multi-functional, 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 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.
Can be set freely with 0.9V
(2.0%) of reference
voltage supply and
external components.
XC9503B093A (300kHz,VOUT1:3.3V)
0
10
20
30
40
50
60
70
80
90
100
0.1
1
10
100
1000
Output Current 1 I
OUT1
(mA)
E
f
f
i
c
i
enc
y
1 E
FFI
1 (%
)
VIN=5.0V
PWM
PWM/PFM Switching
L1=22
H(CDRH5D28), C
L1
=47
F(Tantalum)
SD1:MA2Q737, Tr1:XP162A1355P
L1:22
H
CDRH5D28
Tr2:Pch MOSFET
XP162A12A6P
CIN
:47
F
VIN
=5.0V
Tr1:Pch MOSFET
XP162A12A6P
SD2
:MA2Q737
SD1
:MA2Q737
RFB11
:200k
CFB1
:62pF
RFB12
:75k
VOUT1:3.3V
1 EXT1/
2 VDD
3 FB1
FB2 8
GND 9
EXT2/ 10
4 PWM1
PWM2 7
5 EN1
EN2 6
CL1:
47
FX2
CL2:
47
FX2
VPWM1
VPWM2
VEN2
VEN1
L2:22
H
CDRH5D28
VOUT2:1.8V
RFB21
:220k
RFB22
:220k
CFB2
:62pF
1
Pin Configuration
Pin Assignment
Ordering Information
XC9503
123456
DESCRIPTION
FB Voltage
0.9V
L
5
Standard Feed
Reverse Feed
6
Embossed Tape
Switching Frequency
Standard (10 Pin)
PIN NAME
FUNCTIONS
XC9503 Series
PIN NUMBER
5
8
FB2
2
3
4
2
3
300kHz
B
0
A
500kHz (custom)
Package
9
MSOP-10
R
2ch. Step-down DC/DC Controller ICs
180kHz (custom)
1
EXT 1
Channel 1: External Transistor Drive Pin <Connected to Pch Power MOSFET Gate>
2
V
DD
Supply Voltage
3
FB1
Channel 1 : Output Voltage Monitor Feedback Pin <Threshold value : 0.9V. Output voltage
can be set freely by connecting split resistors between VOUT1 and Ground.>
4
PWM1
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 2 : Output Voltage Monitor Feedback Pin <Threshold value : 0.9V. Output voltage
can be set freely by connecting split resistors between VOUT2 and Ground.>
5
EN1
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.>
6
EN2
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.>
10
EXT 2
Channel 2 : External Transistor Drive Pin <Connected to Pch Power MOSFET Gate>
DESIGNATOR
1
SYMBOL
9
GND
Ground
7
PWM2
Channel 2 : PWM/PFM Switching Pin <Control Output 2. PWM control when connected to
VDD, PWM / PFM auto switching when connected to Ground.>
1 EXT1
2 VDD
3 FB1
FB2 8
GND 9
EXT2 10
4 PWM1
PWM2 7
5 EN1
EN2 6
MSOP-10
(TOP VIEW)
2
Block Diagram
Absolute Maximum Ratings
Ta=25
O
C
* Voltage goes to Ground.
150
O
C
mW
- 0.3 ~ 12
- 0.3 ~ V
DD
+ 0.3
PARAMETER
FB1, 2 Pin Voltage
EN1, 2 Pin Voltage
PWM1,2 Pin Voltage
I
EXT
100
mA
Pd
Operating Ambient Temperature
Storage Temperature
EXT1, 2 Pin Voltage
V
PWM
V
EXT
Topr
V
EXT1, 2 Pin Current
Power Dissipation
V
V
EN
- 0.3 ~ 12
V
- 0.3 ~ 12
V
SYMBOL
RATINGS
UNITS
2ch. Step-down DC/DC Controller ICs
XC9503 Series
V
Tstg
O
C
- 55 ~ +125
- 40 ~ + 85
V
DD
Pin Voltage
V
FB
V
DD
- 0.3 ~ 12
PWM1
+
-
FB1
VDD
EXT1
Vref1 = 0.9V
with Soft Start1,
EN1
+
-
PWM/PFM
Controller 1
Vref2 = 0.9V
with Soft Start 1,
EN2
+
-
PWM/PFM
Controller 2
FB2
GND
EXT2
OSC
Generator
Ramp Wave
Generator 1
Ramp Wave
Generator 2
Error Amp2
Error Amp1
PWM
Comparator2
PWM
Comparator1
EN1
PWM2
EN2
EN1 to
internal circuit
EN2 to
internal circuit
-
+
3
Electrical Characteristics
XC9503B092A
Common Characteristics
Ta=25
O
C
VOUT1
VOUT2
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics
Step-down Controller
Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V
Output 2 Characteristics
Step-down Controller
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
Notes
1)
2)
7
7
5
EFFI2
P-ch MOSFET : XP162A12A6P
92
-
IOUT2=250mA
100
-
-
Same as IDD1
-
EN1=0, EXT1=VDD-0.4V
22
-
MIN.
VIN=3.0V, IOUT1=10mA
0.882
Efficiency1 (note 2)
EFFI1
-
P-ch MOSFET : XP162A12A6P
V
10.0
-
FB1,2 "High" Current
IFBH
FB1, 2=3.0V
VIN
-
Max. Input Voltage
PWM1,2 "Low" Current
PFM Duty Ratio 1
PFMDTY1 No Load, VPWM1=0V
FB1, 2=1.0V
FB1,2 "Low" Current
VFBL
PARAMETER
SYMBOL
CONDITIONS
VFB1
-
-
1
Supply Current 2
IDD2
FB1, 2=1.0V
-
60
140
5.0
VPWMH2 No Load
EN2=0, EXT2=VDD-0.4V
0.65
-
PARAMETER
SYMBOL
CONDITIONS
2
FB2 Voltage
VFB2
VIN=3.0V, IOUT2=10mA
0.882
UNITS
MIN.
PARAMETER
SYMBOL
Supply Voltage
VDD
-
TYP.
MIN.
0.9
2.0
-
PWM1,2 "High" Current
IPWMH
Output Voltage Range
(note 1)
VOUTSET
-
-
-
IPWML
FB1, 2=3.0V, PWM=0V
FB1, 2=0V
TSS2
VOUT2
0.95V, EN2=0V
0.65V
FB1=0V, FB2=1.0V
EN1=3.0V, EN2=0V, FB1=0V
FB1, 2=3.0V, PWM=3.0V
Same as IDD1
Same as IDD2
-
-
PWM2 "High" Voltage
5
47
22
28
30
EXT2 "High" ON Resistance
REXTBH2
PWM2 "Low" Voltage
VPWML2 No Load
MINDTY2
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
Soft-Start Time 2
Efficiency2 (note 2)
0.20
-
-
7
V
V
%
7
7
Minimum Operation Voltage
VINmin2
-
PFM Duty Ratio 2
PFMDTY2 No Load, VPWM2=0V
Minimum Duty Ratio 2
22
-
MAXDTY2
%
TYP.
30
38
%
%
MAX.
0.900
0.918
50
10.0
0
2.0
-
-0.50
-
0.50
-
180
10.0
10.0
CONDITIONS
2ch. Step-down DC/DC Controller ICs
TEST
CIRCUIT
MAX.
UNITS
0.9
Supply Current 1
IDD1
-
3.0
A
Stand-by Current
ISTB
Same as IDD1, EN1=EN2=0V
-
1.0
V
207
kHz
Switching Frequency
FOSC
Same as IDD1
153
Supply Current 1-1
IDD1-1
EN2=3.0V, EN1=0V, FB2=0V
-
-
V
EN1,2 "High" Voltage
VENH
FB1,2=0V
0.65
-
0.20
V
EN1,2 "Low" Voltage
VENL
FB1,2=0V
-
-
0.50
A
EN1,2 "High" Current
IENH
EN1,2=3.0V
-
-
-0.50
A
EN1,2 "Low" Current
IENL
EN1,2=0V, FB1,2=3.0V
-
0.918
0.900
-
0
-
38
30
-
0.20
-
-
10.0
20.0
92
-
Soft-Start Time1
TSS1
PWM1 "Low" Voltage
-
FB2=0V, EXT1=0.4V
EXT1 "Low" ON Resistance
REXTBL1
-
0.65
VPWML1 No Load
VOUT1
0.95V, EN1=0V
0.65V
5.0
A
60
120
A
mS
VIN
2.0V, IOUT1, 2=1mA
V
-
10.0
XC9503 Series
1
1
2
2
2
2
V
A
2
2
2
2
A
2
2
4
UNITS
V
A
%
%
%
V
4
4
6
V
TEST
CIRCUIT
Please be careful not to exceed the breakdown voltage level of the peripheral parts.
EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
-
V
1
2
2
2
110
A
2
Supply Current 1-2
IDD1-2
-
60
130
A
FB1=1.0V, FB2=0V
TYP.
MAX.
TEST
CIRCUIT
2
A
-
0.50
-
-0.50
-
3
Minimum Operation Voltage
VINmin1
-
-
2.0
V
1
FB1 Voltage
%
2
Minimum Duty Ratio1
MINDTY1
2
Maximum Duty Ratio 1
MAXDTY1
100
-
4
EXT1 "High" ON Resistance
REXTBH1
-
28
47
5
4
IOUT1=250mA
22
30
5
PWM1 "High" Voltage
V
Same as IDD2
Maximum Duty Ratio 2
20.0
mS
VPWMH1 No Load
4
Electrical Characteristics
XC9503B093A
Common Characteristics
Ta=25
O
C
VOUT1
VOUT2
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics
Step-down Controller
Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V
Output 2 Characteristics
Step-down Controller
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
Notes
1)
2)
Please be careful not to exceed the breakdown voltage level of the peripheral parts.
EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
-
V
7
7
0.20
V
0.65
PWM2 "Low" Voltage
VPWML2
-
No Load
No Load
PWM2 "High" Voltage
VPWMH2
-
-
22
30
5
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
-
7
EXT2 "High" ON Resistance
REXTBH2 EN2=0, EXT2=VDD-0.4V
-
28
47
5
Soft-Start Time 2
TSS2
VOUT2
0.95V, EN2=0V
0.65V
5.0
7
IOUT2=250mA
92
-
%
7
30
Efficiency2 (note 2)
EFFI2
-
P-ch MOSFET : XP162A12A6P
PFM Duty Ratio 2
PFMDTY2 No Load, VPWM2=0V
22
0.900
0.918
V
6
FB2 Voltage
VFB2
VIN=3.0V, IOUT2=10mA
0.882
TYP.
MAX.
UNITS
TEST
CIRCUIT
PARAMETER
SYMBOL
CONDITIONS
MIN.
-
V
4
4
0.20
V
0.65
PWM1 "Low" Voltage
VPWML1
-
No Load
No Load
PWM1 "High" Voltage
VPWMH1
-
-
22
30
5
EXT1 "Low" ON Resistance
REXTBL1 FB2=0V, EXT1=0.4V
-
4
EXT1 "High" ON Resistance
REXTBH1 EN1=0, EXT1=VDD-0.4V
-
28
47
5
2
38
P-ch MOSFET : XP162A12A6P
Soft-Start Time1
TSS1
VOUT1
0.95V, EN1=0V
0.65V
5.0
10.0
20.0
mS
2
IOUT1=250mA
Minimum Duty Ratio1
MINDTY1 Same as IDD2
No Load, VPWM1=0V
-
-
0
%
2.0
V
1
Maximum Duty Ratio 1
MAXDTY1 Same as IDD1
100
-
-
%
Minimum Operation Voltage
VINmin1
-
-
-0.50
A
2
FB1,2 "Low" Current
VFBL
FB1, 2=1.0V
-
-
0.50
A
2
FB1,2 "High" Current
IFBH
FB1, 2=3.0V
-
-
-0.50
A
2
PWM1,2 "Low" Current
IPWML
FB1, 2=3.0V, PWM=0V
-
-
0.50
A
2
PWM1,2 "High" Current
IPWMH
FB1, 2=3.0V, PWM=3.0V
-
-
-0.50
A
2
EN1,2 "Low" Current
IENL
EN1,2=0V, FB1,2=3.0V
-
-
0.50
A
2
EN1,2 "High" Current
IENH
EN1,2=3.0V
-
-
0.20
V
2
EN1,2 "Low" Voltage
VENL
FB1,2=0V
-
-
-
V
2
EN1,2 "High" Voltage
VENH
FB1,2=0V
0.65
300
345
kHz
2
Switching Frequency
FOSC
Same as IDD1
255
1.0
3.0
A
2
Stand-by Current
ISTB
Same as IDD1, EN1=EN2=0V
-
2
FB1=1.0V, FB2=0V
Supply Current 2
IDD2
FB1, 2=1.0V
-
80
150
A
2
A
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
Supply Current 1-2
IDD1-2
-
70
150
A
Supply Current 1
V
1
-
10.0
V
IDD1
-
10.0
70
140
VIN
2.0V, IOUT1, 2=1mA
0.9
0.9
-
-
-
V
1
Max. Input Voltage
VIN
10.0
-
10.0
V
1
Supply Voltage
VDD
2.0
TEST
CIRCUIT
XC9503 Series
2ch. Step-down DC/DC Controller ICs
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNITS
FB1, 2=0V
2
Supply Current 1-1
Output Voltage Range
(note 1)
VOUTSET
IDD1-1
EN1=3.0V, EN2=0V, FB1=0V
-
60
120
A
2
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
0.918
V
3
FB1 Voltage
VFB1
VIN=3.0V, IOUT1=10mA
0.882
PFMDTY1
22
30
0.900
-
%
4
Efficiency1 (note 2)
EFFI1
-
92
-
%
4
PFM Duty Ratio 1
Minimum Operation Voltage
VINmin2
-
-
2.0
V
1
Maximum Duty Ratio 2
MAXDTY2 Same as IDD1
100
-
-
%
2
2
Minimum Duty Ratio 2
MINDTY2 Same as IDD2
-
-
0
%
38
%
10.0
20.0
mS
5
Electrical Characteristics
XC9503B095A
Common Characteristics
Ta=25
O
C
VOUT1
VOUT2
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics
Step-down Controller
Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V
Output 2 Characteristics
Step-down Controller
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
Notes
1)
2)
Supply Current 1
IDD1
FB1, 2=0V
PARAMETER
FB1,2 "Low" Current
VFBL
FB1, 2=1.0V
PWM1,2 "Low" Current
IPWML
FB1, 2=3.0V, PWM=0V
EN1,2 "Low" Current
Please be careful not to exceed the breakdown voltage level of the peripheral parts.
EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
PARAMETER
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
-
V
7
7
0.20
V
0.65
PWM2 "Low" Voltage
VPWML2
-
No Load
No Load
PWM2 "High" Voltage
VPWMH2
-
-
22
30
5
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
-
28
47
5
EXT2 "High" ON Resistance
REXTBH2 EN2=0, EXT2=VDD-0.4V
-
10.0
20.0
mS
7
Soft-Start Time 2
TSS2
VOUT2
0.95V, EN2=0V
0.65V
5.0
91
-
%
7
MAXDTY2 Same as IDD1
-
P-ch MOSFET : XP162A12A6P
-
Minimum Operation Voltage
IOUT2=250mA
Efficiency2 (note 2)
EFFI2
PFM Duty Ratio 2
PFMDTY2 No Load, VPWM2=0V
Maximum Duty Ratio 2
%
22
30
38
TEST
CIRCUIT
0.900
0.918
V
6
7
V
No Load
No Load
4
-
-
V
4
1
30
-
0.20
PWM1 "High" Voltage
VPWMH1
0.65
-
PWM1 "Low" Voltage
VPWML1
22
5
5
EXT1 "Low" ON Resistance
REXTBL1 FB2=0V, EXT1=0.4V
-
-
28
47
Efficiency1 (note 2)
EXT1 "High" ON Resistance
REXTBH1 EN1=0, EXT1=VDD-0.4V
10.0
20.0
mS
-
EFFI1
4
Soft-Start Time1
TSS1
VOUT1
0.95V, EN1=0V
0.65V
5.0
PFM Duty Ratio 1
PFMDTY1
22
No Load, VPWM1=0V
2
IOUT1=250mA
-
30
38
%
4
P-ch MOSFET : XP162A12A6P
2
4
Maximum Duty Ratio 1
MAXDTY1 Same as IDD1
100
-0.50
A
2
TYP.
MAX.
-
SYMBOL
CONDITIONS
-
UNITS
-
2.0
1
Minimum Operation Voltage
VINmin1
-
2
FB1,2 "High" Current
IFBH
FB1, 2=3.0V
-
-
0.50
A
-
0.50
A
-
-
-0.50
A
PWM1,2 "High" Current
IPWMH
FB1, 2=3.0V, PWM=3.0V
-
-0.50
A
2
2
2
IENL
EN1,2=0V, FB1,2=3.0V
-
-
-
0.50
A
2
EN1,2 "High" Current
IENH
EN1,2=3.0V
-
-
0.20
V
2
EN1,2 "Low" Voltage
VENL
FB1,2=0V
-
-
-
V
2
EN1,2 "High" Voltage
VENH
FB1,2=0V
0.65
500
575
kHz
2
Switching Frequency
FOSC
Same as IDD1
425
1.0
3.0
A
2
Stand-by Current
ISTB
Same as IDD1, EN1=EN2=0V
-
190
A
FB1=1.0V, FB2=0V
2
-
A
150
EN2=3.0V, EN1=0V, FB2=0V
Supply Current 1-1
IDD1-1
EN1=3.0V, EN2=0V, FB1=0V
-
80
Supply Current 2
IDD2
FB1, 2=1.0V
100
2
2
FB1=0V, FB2=1.0V
Supply Current 1-2
IDD1-2
-
100
180
A
2
1
-
10.0
V
Output Voltage Range
(note 1)
Voutset
-
10.0
VIN
2.0V, IOUT1, 2=1mA
0.9
0.9
-
-
-
V
V
90
170
A
1
Max. Input Voltage
VIN
10.0
-
10.0
V
1
Supply Voltage
VDD
2.0
XC9503 Series
2ch. Step-down DC/DC Controller ICs
TEST
CIRCUIT
FB1 Voltage
VFB1
VIN=3.0V, IOUT1=10mA
0.882
0.900
0.918
V
3
MIN.
Minimum Duty Ratio1
MINDTY1 Same as IDD2
-
V
-
%
91
%
-
-
0
%
PARAMETER
2.0
V
SYMBOL
CONDITIONS
MIN.
TYP.
MAX.
UNITS
VFB2
FB2 Voltage
2
100
-
-
%
-
VIN=3.0V, IOUT2=10mA
0.882
VINmin2
2
Minimum Duty Ratio 2
MINDTY2 Same as IDD2
-
-
0
%
6
Operational Description
<Error Amp 1, 2>
<OSC Generator>
<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>
<PWM/PFM Controller 1, 2>
<Vref with Soft Start 1, 2>
<Chip Enable Function>
XC9503 Series
2ch. Step-down DC/DC Controller ICs
This circuit generates PFM pulses.
Control can be switched between PWM control and PWM/PFM automatic switching control using external 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 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).
This circuit generates the Switching Frequency which in turn generates the reference clock.
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.
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 highlevel (the external P-type 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
A.
When the EN1 or EN2 pin's voltage is 0.65V or more, the mode will be chip enable and operations will recommence. With soft-
start, 95% of the set output voltage will be reached within 10mS (TYP) from the moment of chip enable.
The reference voltage, Vref (FB pin voltage)=0.9V, is adjusted and fixed by laser trimming (for output voltage settings, please
refer to page 8). 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 (CL) 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.
The XC9503 series are multi-functional, 2 channel step-down DC/DC converter controller ICs with built-in high speed, low ON
resistance drivers.
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.
7
<Setting of Output Voltage>
V
OUT
=0.9
(RFB11+RFB12) /RFB12
[Example of Calculation]
When RFB11=200k
and RFB12=75k
, V
OUT1
=0.9
(200k+75k) / 75k=3.3V.
[Typical Example]
The same method can be adopted for channel two also.
[External Components]
Tr :
* MOSFET
XP162A12A6P
(TOREX P-Channel Power MOSFET)
SD :
MA2Q737
(Schottky , MATSUSHITA)
CMS02
(Schottky, TOSHIBA)
L :
10
H
(SUMIDA, CDRH5D28, FOSC = 500kHz)
22
H
(SUMIDA, CDRH5D28, FOSC = 300kHz)
22
H
(SUMIDA, CDRH5D28, FOSC = 180kHz)
CL :
16V, 47
F
(Tantalum)
C=(CL standard value)
(IOUT (mA)/500mA
VOUT/VIN
Tr :
* PNP MOSFET
2SA1213
(SANYO)
RB :
500
( Adjust in accordance with load & Tr.'s HFE.)
Set according to the equation below.
RB
(VIN-0.7) x hFE / I
C
-R
EXTBH
CB :
2200pF (Ceramic)
Set according to the equation below.
CB
(2
x RB x FOSC x 0.7)
The same components can be adopted for both channel 1 and channel 2.
XC9503 Series
2ch. Step-down DC/DC Controller ICs
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 1 M
or
The value of CFB1(CFB2), speed-up capacitor for phase compensation, should be fzfb= 1 / (2
CFB1
RFB11) which is
equal to 12kHz. Adjustments are required from 1kHz to 50kHz depending on the application, value of inductance (L), and value
of load capacity (CL).
V
OUT
(V)
RFB11
(k
)
RFB12
(k
)
CFB1
(pF)
V
OUT
(V)
RFB11
(k
)
RFB12
(k
)
CFB1
(pF)
390
220
33
1.0
30
270
430
180
33
1.5
220
330
62
24
1.8
220
220
62
2.0
330
270
39
2.2
390
270
33
18
160
75
62
240
5.0
200
3.0
560
2.7
360
2.5
82
3.3
Note : VGS Breakdown Voltage of this Tr. is 12V
so please be careful with the power supply voltage.
Increase capacity according to the equation below
when the step-up voltage ratio is large and output
current is high.
8
Test Circuits
XC9503 Series
2ch. Step-down DC/DC Controller ICs
R
FB11
R
FB12
C
L1
V
OUT1
51
0
2
2
0
0pF
L2
PNP
Tr2
R
FB21
R
FB22
R
L2
C
L2
V
OUT2
R
L1
V
I
N
1
F
2 VDD
3 FB1
FB2 8
GND 9
4 PWM1
PWM2 7
5 EN1
EN2 6
Circuit 1
Circuit 2
SBD2
C
IN
Circuit 5
Circuit 6
Circuit 7
Pch
MOSFET2
L2
R
L
V
V
IN
V
OUT2
A
A
C
IN
2 VDD
3 FB1
FB2 8
GND 9
4 PWM1
PWM2 7
5 EN1
EN2 6
C
L2
OSC
V
PWM1
V
EN1
A
1
F
V
DD
OSC
A
A
V
PWM2
A
A
V
EN2
2 VDD
3 FB1
FB2 8
GND 9
4 PWM1
PWM2 7
5 EN1
EN2 6
V
FB1
A
V
FB2
A
V
PWM1
V
EN1
1
F
V
DD
V
PWM2
V
EN2
2 VDD
3 FB1
FB2 8
GND 9
4 PWM1
PWM2 7
5 EN1
EN2 6
V
FB1
V
FB2
V
EXT2
SBD2
C
IN
C
FB1
C
FB2
A
Pch
MOSFET2
L2
R
L
V
V
IN
V
OUT2
A
A
2 VDD
3 FB1
FB2 8
GND 9
4 PWM1
PWM2 7
5 EN1
EN2 6
SBD2
200k
75k
C
L2
62 pF
22
00
p
F
51
0
SBD
1
L1
PNP
Tr
1
A
V
EXT1
R
L
V
IN
C
L1
V
OUT1
C
IN
A
2 VDD
3 FB1
FB2 8
GND 9
4 PWM1
PWM2 7
5 EN1
EN2 6
V
A
Pch
MOSFET1
Circuit 3
Circuit 4
R
L
V
IN
C
L1
V
OUT1
C
IN
A
2 VDD
3 FB1
FB2 8
GND 9
4 PWM1
PWM2 7
5 EN1
EN2 6
V
A
Pch
MOSFET1
62pF
SBD1
SBD1
200k
75k
L1
L1
1 EXT1
EXT2 10
EXT2 10
1 EXT1
EXT2 10
1 EXT1
EXT2 10
1 EXT1
EXT2 10
1 EXT1
1 EXT1
EXT2 10
1 EXT1
EXT2 10
9
Peripheral Components Used for Test Circuits
Circuit 1
L1, L2 :
22
H (SUMIDA CDRH5D28)
: XC9503B092A
15
H (SUMIDA CDRH5D28)
: XC9503B093A
10
H (SUMIDA CDRH5D28)
: XC9503B095A
SD1, SD2 :
CRS02 (Schottky diode, TOSHIBA)
EC10QS06 (Schottky diode, NIHON INTER)
CL1, CL2 :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
PNP Tr1, 2:
2SA1213 (TOSHIBA)
RFB :
Please use by the conditions as below.
RFB11 + RFB12
1M
RFB21 + RFB22
1M
RFB11 / RFB12 = (Setting Output Voltage / 0.9) -1
VOUT2=(0.9-VOUT1) X (RFB21/RFB22) + 0.9V
CFB :
Please adjust as below:
fzfb=1/(2 x
x CFB1 x RFB11) = 1kHz ~50kHz ( 12kHz usual)
fzfb=1/(2 x
x CFB2 x RFB21) = 1kHz ~50kHz ( 12kHz usual)
Circuits 3
L1 :
22
H (SUMIDA CDRH5D28)
SD1 :
MA2Q737 (Schottky diode, MATSUSHITA)
CL1 :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET1 :
XP161A12A6P (TOREX)
Circuits 4
L1 :
22
H (SUMIDA CDRH5D28)
: XC9503B092A
15
H (SUMIDA CDRH5D28)
: XC9503B093A
10
H (SUMIDA CDRH5D28)
: XC9503B095A
SD1 :
MA2Q737 (Schottky, MATSUSHITA)
CL1 :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET1 :
XP161A12A6P (TOREX)
Circuit 6
L1 :
22
H (SUMIDA CDRH5D28)
SD1 :
MA2Q737 (Schottky diode, MATSUSHITA)
CL1 :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET2 :
XP162A12A6P (TOREX)
Circuit 7
L2 :
22
H (SUMIDA CDRH5D28)
: XC9503B092A
15
H (SUMIDA CDRH5D28)
: XC9503B093A
10
H (SUMIDA CDRH5D28)
: XC9503B095A
SD2 :
MA2Q737 (Schottky, MATSUSHITA)
CL2 :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
CIN :
16MCE476MD2 (Tantalum, NIHON CHEMICON)
P-ch MOSFET2 :
XP161A12A6P (TOREX)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
10
Notes on Use
1. Checking for Intermittent Oscillation
2. PWM/PFM Automatic Switching
3. Ratings
Use the XC9503 series and peripheral components within the limits of their ratings.
XC9503 Series
2ch. Step-down DC/DC Controller ICs
The XC9503 series is subject to intermittent oscillation in the proximity of the maximum duty 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 CL.
If PWM/PFM automatic switching control is selected and the step-down ratio is high (e.g., from 10 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 XC9503 series. The output voltage's ripple voltage becomes substantially high under heavy load conditions, with
the XC9503 series appearing to be producing an abnormal oscillation. If this operation becomes a concern, set pins PWM1 and
PWM2 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 IOUT = 100 mA.
11
Typical Performance Characteristics
(1) Output Voltage vs. Output Current
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=300kHz, V
OUT1, 2
=1.0V
0.7
0.8
0.9
1.0
1.1
1.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
FOCS=300kHz, V
OUT1, 2
=1.0V
0.7
0.8
0.9
1.0
1.1
1.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
VIN=2.7V 3.3V
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
4.2V, 6.0V 8.0V 10.0V
5.0V
FOSC=300kHz, V
OUT1, 2
=1.8V
1.5
1.6
1.7
1.8
1.9
2.0
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN= 2.7V 3.3V 4.2V
5.0V 6.0V 8.0V 10V
FOSC=300kHz, V
OUT1, 2
=1.8V
1.5
1.6
1.7
1.8
1.9
2.0
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN= 2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10.0V
FOSC=300kHz, V
OUT1, 2
=2.5V
2.2
2.3
2.4
2.5
2.6
2.7
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN= 2.7V 3.3V 4.2V
5.0V 6.0V 8.0V
FOSC=300kHz, V
OUT1, 2
=2.5V
2.2
2.3
2.4
2.5
2.6
2.7
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
3.3V 4.2V 5.0V 6.0V
8.0V
VIN=2.7V
12
(1) Output Voltage vs. Output Current (continued)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=300kHz, V
OUT1, 2
=3.3V
3.0
3.1
3.2
3.3
3.4
3.5
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN=4.2V 5.0V 6.0V 8.0V
FOSC=300kHz, V
OUT1, 2
=3.3V
3.0
3.1
3.2
3.3
3.4
3.5
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN=4.2V 5.0V 6.0V 8.0V
FOSC=300kHz, V
OUT1, 2
=5.0V
4.7
4.8
4.9
5.0
5.1
5.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN= 6.0V 8.0V
FOSC=300kHz, V
OUT1, 2
=5.0V
4.7
4.8
4.9
5.0
5.1
5.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN= 6.0V 8.0V
FOSC=180kHz, V
OUT1, 2
=1.0V
0.7
0.8
0.9
1.0
1.1
1.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
L=47
H(CDRH6D38), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN=2.7V 3.3V 4.2V
5.0V 6.0V 8.0V
FOSC=180kHz, V
OUT1, 2
=1.0V
0.7
0.8
0.9
1.0
1.1
1.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
L=47
H(CDRH6D38), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
4.2V 5.0V 6.0V 8.0V
VIN=2.7V 3.0V
13
(1) Output Voltage vs. Output Current (continued)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=180kHz, V
OUT1, 2
=3.3V
3.0
3.1
3.2
3.3
3.4
3.5
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
PWM Control
L=47
H(CDRH6D38), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=4.2V 5.0V 6.0V 8.0V 10V
FOSC=180kHz, V
OUT1, 2
=5.0V
4.7
4.8
4.9
5.0
5.1
5.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
PWM Control
L=47
H(CDRH6D38), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN= 6.0V 8.0V 10V
FOSC=500kHz, V
OUT1, 2
=1.0V
0.7
0.8
0.9
1.0
1.1
1.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
FOSC=500kHz, V
OUT1, 2
=1.0V
0.7
0.8
0.9
1.0
1.1
1.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10.0V
FOSC=500kHz, V
OUT1, 2
=3.3V
3.0
3.1
3.2
3.3
3.4
3.5
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=4.2V 5.0V 6.0V 8.0V 10V
FOSC=500kHz, V
OUT1, 2
=3.3V
3.0
3.1
3.2
3.3
3.4
3.5
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=4.2V 5.0V 6.0V 8.0V
10.0V
14
(1) Output Voltage vs. Output Current (continued)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=500kHz, V
OUT1, 2
=5.0V
4.7
4.8
4.9
5.0
5.1
5.2
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Out
put
V
o
l
t
age1,
2 V
OUT
1
, 2
(V
)
PWM/PFM Switching Control
PWM Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN= 6.0V 8.0V 10V
15
(2) Efficiency vs. Output Current
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=300kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V
4.2V
3.3V
PWM/PFM Switching Control
PWM Control
FOSC=300kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=5.0V
10.0V
6.0V
PWM/PFM Switching Control
PWM Control
FOSC=300kHz, V
OUT1, 2
=1.8V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(
%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
3.3V
VIN= 2.7V
4.2V
FOSC=300kHz, V
OUT1, 2
=1.8V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
6.0V
VIN=5.0V
8.0V
10.0V
FOSC=300kHz, V
OUT1, 2
=2.5V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
4.2V
VIN=2.7V
3.3V
PWM/PFM Switching Control
PWM Control
FOSC=300kHz, V
OUT1, 2
=2.5V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=5.0V
10V
6.0V
PWM/PFM Switching Control
PWM Control
16
(2) Efficiency vs. Output Current (continued)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=300kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.0V
VIN=4.2V
6.0V
8.0V
10.0V
PWM/PFM Switching Control
PWM Control
FOSC=300kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=6.0V
PWM/PFM Switching Control
PWM Control
10.0V
FOSC=180kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(
%
)
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V
4.2V
3.3V
PWM/PFM Switching Control
PWM Control
FOSC=180kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
6.0V
VIN=5.0V
10V
8.0V
PWM/PFM Switching Control
PWM Control
FOSC=180kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
6.0V
VIN=4.2V
10V
8.0V
5.0V
PWM/PFM Switching Control
PWM Control
FOSC=180kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=6.0V
10V
PWM/PFM Switching Control
PWM Control
17
(2) Efficiency vs. Output Current (continued)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=500kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
3.3V
VIN=2.7V
PWM/PFM Switching Control
PWM Control
4.2V
FOSC=500kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(%
)
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10V
VIN=5.0V
PWM/PFM Switching Control
PWM Control
8.0V
6.0V
FOSC=500kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(
%
)
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.0V
VIN=4.2V
PWM/PFM Switching Control
PWM Control
6.0V
8.0V
10.0V
FOSC=500kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Effi
ci
e
n
cy1
, 2
E
FFI
1
,
2
(
%
)
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=6.0V
PWM/PFM Switching Control
PWM Control
10.0V
18
(3) Ripple Voltage vs. Output Current
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
19
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=300kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
4.2V
8.0V 10V
VIN=2.7V 3.3V 5.0V 6.0V
FOSC=300kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.0V
VIN=2.7V
3.3V
8.0V
4.2V
10V
6.0V
FOSC=300kHz, V
OUT1, 2
=1.8V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
FOSC=300kHz, V
OUT1, 2
=1.8V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10V
VIN=2.7V
3.3V
4.2V
5.0V
6.0V
8.0V
FOSC=300kHz, V
OUT1, 2
=2.5V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
FOSC=300kHz, V
OUT1, 2
=2.5V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.0V
VIN=2.7V
3.3V
4.2V
6.0V
8.0V
10V
(3) Ripple Voltage vs. Output Current (continued)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
20
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=300kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=4.2V 5.0V 6.0V
8.0V 10V
FOSC=300kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN=4.2V
8.0V
6.0V
5.0V
FOSC=300kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10V
VIN=6.0V
8.0V
FOSC=300kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=22
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10.0V
VIN=6.0V
8.0V
FOSC=180kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
FOSC=180kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
VIN=2.7V
PWM/PFM Switching Control
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
6.0V
10V
8.0V
5.0V
4.2V
3.3V
(3) Ripple Voltage vs. Output Current (continued)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94
F (Tantalum) + 100
F (OS-COM)
21
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=180kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=4.2V 6.0V
10V
5.0V
FOSC=180kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.0V
VIN=4.2V
10V
8.0V
6.0V
FOSC=180kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=47
H(CDRH6D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10V
VIN=6.0V
8.0V
FOSC=180kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=47
H(CDRH6D28), CL=94
F(Tantaium)
SD:CMS02, Tr:XP162A12A6P
10V
VIN=6.0V
8.0V
FOSC=500kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
FOSC=500kHz, V
OUT1, 2
=1.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
4.2V
6.0V
5.0V
10V
8.0V
VIN=2.7V
3.3V
(3) Ripple Voltage vs. Output Current (continued)
22
XC9503 Series
2ch. Step-down DC/DC Controller ICs
FOSC=500kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10V
VIN=4.2V
5.0V
6.0V
8.0V
FOSC=500kHz, V
OUT1, 2
=3.3V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
10V
VIN=4.2V
8.0V
6.0V
5.0V
FOSC=500kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=6.0V
10V
FOSC=500kHz, V
OUT1, 2
=5.0V
0
20
40
60
80
100
0.1
1
10
100
1000
Output Current1, 2 I
OUT1, 2
(mA)
Ri
ppl
e V
o
l
t
age1,
2 (m
V
)
PWM/PFM Switching Control
L=10
H(CDRH5D28), CL=94
F(Tantalum)
SD:CMS02, Tr:XP162A12A6P
8.0V
VIN=6.0V
10V
(4) Supply Current 1 vs. Supply Voltage
(5) Supply Current 1_1 vs. Supply Voltage
(6) Supply Current 1_2 vs. Supply Voltage
(7) Supply Current 2 vs. Supply Voltage
(8) Stand-by Current vs. Supply Voltage
(9) Oscillation Frequency vs. Supply Voltage
23
XC9503 Series
2ch. Step-down DC/DC Controller ICs
XC9503B092 (180KHz)
0
50
100
150
200
250
0
2
4
6
8
10
Supply Voltage VDD (V)
S
uppl
y
Current
1 I
DD1 (
A)
XC9503B092 (180KHz)
0
50
100
150
200
250
0
2
4
6
8
10
Supply Voltage VDD (V)
S
uppy
Current
1-1 I
D
D1-1 (
A)
Topr=85
O
C
25
O
C
- 40
O
C
Topr=85
O
C
25
O
C
- 40
O
C
XC9503B092 (180KHz)
0
50
100
150
200
250
0
2
4
6
8
10
Supply Voltage VDD (V)
S
uppl
y
Current
1-2 I
D
D1-2 (
A)
XC9503B092 (180KHz)
0
50
100
150
200
250
0
2
4
6
8
10
Supply Voltage VDD (V)
S
uppl
y
Current
2 I
DD2 (
A)
XC9503B092 (180KHz)
0
2
4
6
8
10
0
2
4
6
8
10
Suppy Voltage VDD (V)
S
t
and-by
Curret
I
S
TB
(
A)
XC9503B093(180kHz)
240
270
300
330
360
0
2
4
6
8
10
Supply Voltage VDD (V)
Os
c
illalt
ion Frequenc
y
Fos
c
(k
Hz
)
Topr=85
O
C
25
O
C
- 40
O
C
Topr=85
O
C
25
O
C
- 40
O
C
Topr=85
O
C
25
O
C
- 40
O
C
Topr=85
O
C
25
O
C
- 40
O
C
(10) EN1, 2 'High' 'Low' Voltage vs. Supply Voltage
(11) PWM1, 2 'High' 'Low' Voltage vs. Supply Voltage
(12) PFM duty ratio 1, 2 vs. Supply Voltage
(13) Output Voltage vs. Ambient Temperature
(14) EXT1, 2 'High' On Resistance vs. Supply Voltage
(14) EXT1, 2 'Low' On Resistance vs. Supply Voltage
24
XC9503 Series
2ch. Step-down DC/DC Controller ICs
XC9503B093 (300KHz)
0
0.2
0.4
0.6
0.8
0
2
4
6
8
10
Supply Voltage VDD (V)
E
N
1,
2 '
H
'
'
L
'
V
o
l
t
age V
E
N
1, 2
(V
)
XC9503B093 (300KHz)
0
0.2
0.4
0.6
0.8
0
2
4
6
8
10
Supply Voltage VDD (V)
P
W
M1, 2 'H
' 'L' V
o
l
t
age V
PWM
1
,
2
(V
)
XC9503B093(300kHz)
20
25
30
35
40
0
2
4
6
8
10
Supply Voltage VDD (V)
P
F
M
dut
y
rat
i
o 1,
2 (%
)
XC9503B093(300kHz)
3.0
3.1
3.2
3.3
3.4
3.5
0
2
4
6
8
10
Supply Voltage VDD (V)
Out
put
V
o
l
t
age V
OUT
1
, 2
(V
)
XC9503B092 (180KHz)
0
10
20
30
40
50
0
2
4
6
8
10
Supply Voltage VDD (V)
E
X
T
1,
2 '
H
i
gh'
On Res
i
s
t
anc
e (
)
XC9503B092 (180KHz)
0
10
20
30
40
50
0
2
4
6
8
10
Supply Voltage VDD (V)
E
X
T1,
2 '
Low'
ON Res
i
s
t
anc
e (
)
85
O
C
- 40
O
C
Topr=25
O
C
- 40
O
C
85
O
C
Topr=25
O
C
VIN=5.0V
IOUT1, 2 =200mA
L=22
H(CDRH5D28), CL=94
F (Tantalum)
SD:CMS02 Tr:XP162A12A6
Topr=85
O
C
25
O
C
- 40
O
C
Topr=85
O
C
25
O
C
- 40
O
C
Topr=85
O
C
25
O
C
- 40
O
C
(16) Soft Start Time 1, 2 vs. Supply Voltage
25
XC9503 Series
2ch. Step-down DC/DC Controller ICs
XC9503B092 (180KHz)
0
5
10
15
20
25
0
2
4
6
8
10
Supply Voltage VDD (V)
S
o
ft S
t
art Ti
me 1, 2 TS
S
1
, 2 (msec)
!
Load Transient Response
< VOUT1, 2 = 3.3 V, VIN = 5.0V
IOUT1, 2 = 100
A
!
300mA >
"
PWM Control
FOSC = 300kHz, VOUT1, 2 = 3.3V
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 100
A
"
300mA
VIN = 5.0V, IOUT = 1, 2 = 300mA
"
100
A
CH1
3.3V
3.3V
CH1
300mA
300mA
CH2
100
A
CH2
100
A
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
"
PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 3.3V
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 100
A
"
300mA
VIN = 5.0V, IOUT = 1, 2 = 300mA
"
100
A
CH1
3.3V
CH1
3.3V
300mA
300mA
CH2
100
A
CH2
100
A
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
26
200
sec / div
10msec / div
200
sec / div
10msec / div
XC9503 Series
2ch. Step-down DC/DC Controller ICs
!
Load Transient Response
< VOUT1, 2 = 3.3 V, VIN = 5.0V
IOUT1, 2 = 10mA
!
300mA >
"
PWM Control
FOSC = 300kHz, VOUT1, 2 = 3.3V
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 10mA
"
300mA
VIN = 5.0V, IOUT = 1, 2 = 300mA
"
10mA
CH1
3.3V
3.3V
CH1
300mA
300mA
CH2
10mA
CH2
10mA
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
"
PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 3.3V
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 10mA
"
300mA
VIN = 5.0V, IOUT = 1, 2 = 300mA
"
10mA
CH1
3.3V
CH1
3.3V
300mA
300mA
CH2
10mA
CH2
10mA
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
27
200
sec / div
400
sec / div
200
sec / div
200
sec / div
XC9503 Series
2ch. Step-down DC/DC Controller ICs
!
Load Transient Response
< VOUT1, 2 = 0.9 V, VIN = 3.3V
IOUT1, 2 = 100
A
!
300mA >
"
PWM Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 100
A
"
300mA
VIN = 3.3V, IOUT = 1, 2 = 300mA
"
100
A
CH1
0.9V
CH1
0.9V
300mA
300mA
CH2
100
A
CH2
100
A
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
"
PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 100
A
"
300mA
VIN = 3.3V, IOUT = 1, 2 = 300mA
"
100
A
CH1
0.9V
CH1
0.9V
300mA
300mA
CH2
100
A
CH2
100
A
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
28
200
sec / div
200
sec / div
XC9503 Series
2ch. Step-down DC/DC Controller ICs
200
sec / div
4msec / div
!
Load Transient Response
< VOUT1, 2 = 0.9 V, VIN = 3.3V
IOUT1, 2 = 10mA
!
300mA >
"
PWM Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 10mA
"
300mA
VIN = 3.3V, IOUT = 1, 2 = 300mA
"
10mA
CH1
0.9V
CH1
0.9V
300mA
300mA
CH2
10mA
CH2
10mA
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
"
PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 10mA
"
300mA
VIN = 3.3V, IOUT = 1, 2 = 300mA
"
10mA
CH1
0.9V
CH1
0.9V
300mA
300mA
CH2
10mA
CH2
10mA
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
CH2 : IOUT1, 2, 150mA/div
29
1
00
sec / div
100
sec / div
200
sec / div
200
sec / div
XC9503 Series
2ch. Step-down DC/DC Controller ICs
!
Load Transient Response
< PWM Control
!
PWM / PFM Switching Control >
FOSC = 300kHz, VOUT1, 2 = 3.3V
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 5mA PWM1, 2 'Low'
"
'High'
VIN = 5.0V, IOUT = 1, 2 = 5mA PWM1, 2 'HIgh'
"
'Low'
CH1
3.3V
CH1
3.3V
0.65V
0.65V
CH2
0V
CH2
0V
CH1 : VOUT1, 2, AC-COUPLED, 10mV/div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 0.5V/div
CH2 : IOUT1, 2, 0.5V/div
< Soft Start Wave Form >
FOSC = 300kHz, VOUT1, 2 = 3.3V
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 300mA EN1, 2 'Low'
"
'High'
VIN = 5.0V, IOUT = 1, 2 = 100mA EN1, 2 'Low'
"
'High'
CIN=47
F
CIN=47
F
3.3V
3.3V
CH1
CH1
200mA
75mA
CH2
CH2
0.65V
0.65V
CH3
CH3
CH1 : VOUT1, 2, 2.0V/div
CH1 : VOUT1, 2, 2.0V/div
CH2 : IIN1, 2, 100mA/div
CH2 : IIN1, 2, 50mA/div
CH3 : EN1, 2, 0.5V/div
CH3 : EN1, 2, 0.5V/div
* CH1 : EN2=GND when measurement
CH2 : EN1=GND when measurement
30
4msec / div
4msec / div
XC9503 Series
2ch. Step-down DC/DC Controller ICs
4
00
sec / div
2
00
sec / div
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