XC9503 Series
2ch. Step-down DC/DC Controller ICs
Mar. 14, 2003 Ver. 2
Applications
z PDAs
z Palm Top Computers
z Digital Cameras
z Various Multi-Function Power Supplies
2ch DC/DC Controller (Step-down + Step-down)
Input Voltage Range 2.0V ~ 10.0V
Output Voltage Externally Set-Up
Switching Frequency 300kHz (±15%)
Maximum Duty Cycle 100%
PWM, PWM/PFM Switching Control
High Efficiency
Step-down 92% (Typ.)
Small MSOP-10 package
Features
Input Voltage Range
: 2.0V ~ 10V
Power Supply Voltage Range : 2.0V ~ 10V
Output Voltage Range
: 0.9V ~ 6.0V
Can be set freely with 0.9V
(±2.0%) of reference
voltage supply and
external components.
General Description
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 customdesigned 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.
Oscillation Frequency
±15%
: 300kHz
(180kHz, 500kHz custom)
Output Current
Stand-By Function
Package
Soft-Start Time
: more than 1000mA (VIN=5.0V, VOUT=3.3V)
: 3.0µA (MAX.)
: MSOP-10
: 10 ms (internally set)
Typical Performance Characteristics
XC9503B093A (300kHz,VOUT1:3.3V)
L1=22µH(CDRH5D28), CL1=47µF(Tantalum)
SD1:MA2Q737, Tr1:XP162A1355P
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.
100
PWM/PFM Switching
Efficiency 1 EFFI1 (%)
90
80
70
VIN=5.0V
60
50
40
30
20
10
PWM
0
0.1
Typical Application Circuit
1
10
100
Output Current 1 IOUT1(mA)
1000
XC9503B093A Input :
VOUT1 : 3.3V, VOUT2 : 1.8V
VOUT1:3.3V
L1:22µH
CDRH5D28
Tr2:Pch MOSFET
XP162A12A6P
Tr1:Pch MOSFET
XP162A12A6P
SD1
:MA2Q737
RFB11
:200kΩ
VIN
=5.0V
VOUT2:1.8V
SD2
:MA2Q737
CIN
:47µF
CFB1
:62pF
CFB2
:62pF
1 EXT1/
CL1:
47µFX2
2 VDD
3 FB1
VPWM1
RFB12
:75kΩ
L2:22µH
CDRH5D28
VEN1
RFB21
:220kΩ
EXT2/ 10
CL2:
47µFX2
GND 9
FB2 8
4 PWM1
5 EN1
PWM2 7
EN2 6
1
VPWM2
VEN2
RFB22
:220kΩ
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Pin Configuration
1 EXT1
EXT2 10
2 VDD
GND 9
3 FB1
FB2 8
4 PWM1
PWM2 7
5 EN1
EN2 6
MSOP-10
(TOP VIEW)
Pin Assignment
PIN NUMBER
PIN NAME
FUNCTIONS
1
EXT 1
2
VDD
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
VDD, PWM / PFM auto switching when connected to 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.>
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.>
8
FB2
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.>
9
GND
Ground
10
EXT 2
Channel 2 : External Transistor Drive Pin <Connected to Pch Power MOSFET Gate>
Channel 1: External Transistor Drive Pin <Connected to Pch Power MOSFET Gate>
Ordering Information
XC9503123456
DESIGNATOR
SYMBOL
1
2
3
B
Standard (10 Pin)
0
9
FB Voltage
4
2
3
5
A
R
5
6
L
DESCRIPTION
0.9V
Switching Frequency
180kHz (custom)
300kHz
500kHz (custom)
Package
Embossed Tape
MSOP-10
Standard Feed
Reverse Feed
2
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Block Diagram
PWM/PFM
Controller 1
EXT1
PWM/PFM
Controller 2
PWM
Comparator2
PWM
Comparator1
VDD
+
FB1
-
-
EXT2
GND
+
+
FB2
+
-
-
Error Amp1 Ramp Wave
Generator 1
Ramp Wave Error Amp2
Generator 2
PWM1
PWM2
OSC
Generator
Vref1 = 0.9V
with Soft Start1,
EN1
EN1 to
internal circuit
EN1
EN2 to
internal circuit
Vref2 = 0.9V
with Soft Start 1,
EN2
EN2
Absolute Maximum Ratings
Ta=25OC
PARAMETER
SYMBOL
RATINGS
UNITS
VDD Pin Voltage
VDD
- 0.3 ~ 12
V
FB1, 2 Pin Voltage
VFB
- 0.3 ~ 12
V
EN1, 2 Pin Voltage
VEN
- 0.3 ~ 12
V
PWM1,2 Pin Voltage
VPWM
- 0.3 ~ 12
V
EXT1, 2 Pin Voltage
VEXT
- 0.3 ~ VDD + 0.3
V
EXT1, 2 Pin Current
IEXT
±100
mA
Power Dissipation
Pd
150
mW
Operating Ambient Temperature
Topr
- 40 ~ + 85
Storage Temperature
O
C
O
C
- 55 ~ +125
* Voltage goes to Ground.
Tstg
3
XC9503 Series
Electrical Characteristics
2ch. Step-down DC/DC Controller ICs
XC9503B092A
Ta=25OC
Common Characteristics
PARAMETER
SYMBOL
Supply Voltage
Max. Input Voltage
Output Voltage Range
(note 1)
VDD
VIN
VOUTSET
CONDITIONS
VIN ≥ 2.0V, IOUT1, 2=1mA
VOUT1
VOUT2
FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V
Supply Current 1-1
IDD1-1
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
Supply Current 1-2
IDD1-2
FB1=1.0V, FB2=0V
Supply Current 2
IDD2
FB1, 2=1.0V
Stand-by Current
ISTB
Same as IDD1, EN1=EN2=0V
Switching Frequency
FOSC
Same as IDD1
EN1,2 "High" Voltage
VENH
FB1,2=0V
EN1,2 "Low" Voltage
VENL
FB1,2=0V
EN1,2 "High" Current
IENH
EN1,2=3.0V
EN1,2 "Low" Current
IENL
EN1,2=0V, FB1,2=3.0V
PWM1,2 "High" Current
IPWMH FB1, 2=3.0V, PWM=3.0V
PWM1,2 "Low" Current
IPWML
FB1, 2=3.0V, PWM=0V
FB1,2 "High" Current
IFBH
FB1, 2=3.0V
FB1,2 "Low" Current
VFBL
FB1, 2=1.0V
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Supply Current 1
IDD1
Output 1 Characteristics
TYP.
MAX.
UNITS
2.0
10.0
0.9
0.9
-
60
10.0
10.0
10.0
120
V
V
V
V
µA
1
1
-
50
110
µA
2
-
60
130
µA
2
153
0.65
-
60
140
1.0
180
-
3.0
207
0.20
0.50
-0.50
0.50
-0.50
0.50
-0.50
µA
µA
kHz
V
V
µA
µA
µA
µA
µA
µA
2
2
2
2
2
2
2
2
2
2
2
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
0.882
100
22
0.900
30
0.918
2.0
0
38
V
V
%
%
%
3
1
2
2
4
-
92
-
%
4
20.0
47
30
0.20
mS
Ω
Ω
V
V
4
5
5
4
4
1
2
Step-down Controller
PARAMETER
SYMBOL
FB1 Voltage
Minimum Operation Voltage
Maximum Duty Ratio 1
Minimum Duty Ratio1
PFM Duty Ratio 1
VFB1
VINmin1
MAXDTY1
MINDTY1
PFMDTY1
Efficiency1 (note 2)
EFFI1
CONDITIONS
VIN=3.0V, IOUT1=10mA
Same as IDD1
Same as IDD2
No Load, VPWM1=0V
IOUT1=250mA
P-ch MOSFET : XP162A12A6P
VOUT1 × 0.95V, EN1=0V→0.65V
Soft-Start Time1
TSS1
10.0
5.0
EXT1 "High" ON Resistance REXTBH1 EN1=0, EXT1=VDD-0.4V
28
22
EXT1 "Low" ON Resistance
REXTBL1 FB2=0V, EXT1=0.4V
PWM1 "High" Voltage
VPWMH1 No Load
0.65
PWM1 "Low" Voltage
VPWML1 No Load
Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V
Output 2 Characteristics
Step-down Controller
PARAMETER
SYMBOL
FB2 Voltage
Minimum Operation Voltage
Maximum Duty Ratio 2
Minimum Duty Ratio 2
PFM Duty Ratio 2
VFB2
VINmin2
MAXDTY2
MINDTY2
PFMDTY2
Efficiency2 (note 2)
EFFI2
CONDITIONS
VIN=3.0V, IOUT2=10mA
Same as IDD1
Same as IDD2
No Load, VPWM2=0V
IOUT2=250mA
P-ch MOSFET : XP162A12A6P
VOUT2 × 0.95V, EN2=0V→0.65V
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
0.882
100
22
0.900
30
0.918
2.0
0
38
V
V
%
%
%
6
1
2
2
7
-
92
-
%
7
20.0
47
30
0.20
mS
Ω
Ω
V
V
7
5
5
7
7
10.0
5.0
TSS2
Soft-Start Time 2
EXT2 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V
28
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
22
VPWMH2 No Load
0.65
PWM2 "High" Voltage
PWM2 "Low" Voltage
VPWML2 No Load
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
Notes
TEST
CIRCUIT
MIN.
1) Please be careful not to exceed the breakdown voltage level of the peripheral parts.
2) EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
4
XC9503 Series
Electrical Characteristics
2ch. Step-down DC/DC Controller ICs
XC9503B093A
Ta=25OC
Common Characteristics
PARAMETER
SYMBOL
Supply Voltage
Max. Input Voltage
Output Voltage Range
(note 1)
VDD
VIN
VOUTSET
CONDITIONS
VIN ≥ 2.0V, IOUT1, 2=1mA
VOUT1
VOUT2
FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V
Supply Current 1-1
IDD1-1
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
Supply Current 1-2
IDD1-2
FB1=1.0V, FB2=0V
Supply Current 2
IDD2
FB1, 2=1.0V
Stand-by Current
ISTB
Same as IDD1, EN1=EN2=0V
Switching Frequency
FOSC
Same as IDD1
EN1,2 "High" Voltage
VENH
FB1,2=0V
EN1,2 "Low" Voltage
VENL
FB1,2=0V
EN1,2 "High" Current
IENH
EN1,2=3.0V
EN1,2 "Low" Current
IENL
EN1,2=0V, FB1,2=3.0V
PWM1,2 "High" Current
IPWMH FB1, 2=3.0V, PWM=3.0V
PWM1,2 "Low" Current
IPWML
FB1, 2=3.0V, PWM=0V
FB1,2 "High" Current
IFBH
FB1, 2=3.0V
FB1,2 "Low" Current
VFBL
FB1, 2=1.0V
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Supply Current 1
IDD1
Output 1 Characteristics
TYP.
MAX.
UNITS
2.0
10.0
0.9
0.9
-
70
10.0
10.0
10.0
140
V
V
V
V
µA
1
1
-
60
120
µA
2
-
70
150
µA
2
255
0.65
-
80
150
1.0
300
-
3.0
345
0.20
0.50
-0.50
0.50
-0.50
0.50
-0.50
µA
µA
kHz
V
V
µA
µA
µA
µA
µA
µA
2
2
2
2
2
2
2
2
2
2
2
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
0.882
100
22
0.900
30
0.918
2.0
0
38
V
V
%
%
%
3
1
2
2
4
-
92
-
%
4
20.0
47
30
0.20
mS
Ω
Ω
V
V
4
5
5
4
4
1
2
Step-down Controller
PARAMETER
SYMBOL
FB1 Voltage
Minimum Operation Voltage
Maximum Duty Ratio 1
Minimum Duty Ratio1
PFM Duty Ratio 1
VFB1
VINmin1
MAXDTY1
MINDTY1
PFMDTY1
Efficiency1 (note 2)
EFFI1
CONDITIONS
VIN=3.0V, IOUT1=10mA
Same as IDD1
Same as IDD2
No Load, VPWM1=0V
IOUT1=250mA
P-ch MOSFET : XP162A12A6P
VOUT1 × 0.95V, EN1=0V→0.65V
Soft-Start Time1
TSS1
5.0
10.0
EXT1 "High" ON Resistance REXTBH1 EN1=0, EXT1=VDD-0.4V
28
EXT1 "Low" ON Resistance
REXTBL1 FB2=0V, EXT1=0.4V
22
PWM1 "High" Voltage
VPWMH1 No Load
0.65
PWM1 "Low" Voltage
VPWML1 No Load
Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V
Output 2 Characteristics
Step-down Controller
PARAMETER
SYMBOL
FB2 Voltage
Minimum Operation Voltage
Maximum Duty Ratio 2
Minimum Duty Ratio 2
PFM Duty Ratio 2
VFB2
VINmin2
MAXDTY2
MINDTY2
PFMDTY2
Efficiency2 (note 2)
EFFI2
CONDITIONS
VIN=3.0V, IOUT2=10mA
Same as IDD1
Same as IDD2
No Load, VPWM2=0V
IOUT2=250mA
P-ch MOSFET : XP162A12A6P
VOUT2 × 0.95V, EN2=0V→0.65V
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
0.882
100
22
0.900
30
0.918
2.0
0
38
V
V
%
%
%
6
1
2
2
7
-
92
-
%
7
20.0
47
30
0.20
mS
Ω
Ω
V
V
7
5
5
7
7
Soft-Start Time 2
TSS2
5.0
10.0
EXT2 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V
28
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
22
PWM2 "High" Voltage
VPWMH2 No Load
0.65
PWM2 "Low" Voltage
VPWML2 No Load
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
Notes
TEST
CIRCUIT
MIN.
1) Please be careful not to exceed the breakdown voltage level of the peripheral parts.
2) EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
5
XC9503 Series
Electrical Characteristics
2ch. Step-down DC/DC Controller ICs
XC9503B095A
Ta=25OC
Common Characteristics
PARAMETER
SYMBOL
Supply Voltage
Max. Input Voltage
Output Voltage Range
(note 1)
VDD
VIN
Supply Current 1
Voutset
CONDITIONS
VIN ≥ 2.0V, IOUT1, 2=1mA
VOUT1
VOUT2
IDD1
FB1, 2=0V
EN1=3.0V, EN2=0V, FB1=0V
Supply Current 1-1
IDD1-1
EN2=3.0V, EN1=0V, FB2=0V
FB1=0V, FB2=1.0V
Supply Current 1-2
IDD1-2
FB1=1.0V, FB2=0V
Supply Current 2
IDD2
FB1, 2=1.0V
Stand-by Current
ISTB
Same as IDD1, EN1=EN2=0V
Switching Frequency
FOSC
Same as IDD1
EN1,2 "High" Voltage
VENH
FB1,2=0V
EN1,2 "Low" Voltage
VENL
FB1,2=0V
EN1,2 "High" Current
IENH
EN1,2=3.0V
IENL
EN1,2=0V, FB1,2=3.0V
EN1,2 "Low" Current
PWM1,2 "High" Current
IPWMH FB1, 2=3.0V, PWM=3.0V
PWM1,2 "Low" Current
IPWML
FB1, 2=3.0V, PWM=0V
FB1,2 "High" Current
IFBH
FB1, 2=3.0V
FB1,2 "Low" Current
VFBL
FB1, 2=1.0V
Unless otherwise stated, VDD=3.0V, PWM1,2=3.0V, EN1, 2 =3.0V
Output 1 Characteristics
TYP.
MAX.
UNITS
2.0
10.0
0.9
0.9
-
90
10.0
10.0
10.0
170
V
V
V
V
µA
1
1
-
80
150
µA
2
-
100
180
µA
2
425
0.65
-
100
190
1.0
500
-
3.0
575
0.20
0.50
-0.50
0.50
-0.50
0.50
-0.50
µA
µA
kHz
V
V
µA
µA
µA
µA
µA
µA
2
2
2
2
2
2
2
2
2
2
2
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
0.882
100
22
0.900
30
0.918
2.0
0
38
V
V
%
%
%
3
1
2
2
4
-
91
-
%
4
20.0
47
30
0.20
mS
Ω
Ω
V
V
4
5
5
4
4
1
2
Step-down Controller
PARAMETER
SYMBOL
FB1 Voltage
Minimum Operation Voltage
Maximum Duty Ratio 1
Minimum Duty Ratio1
PFM Duty Ratio 1
VFB1
VINmin1
MAXDTY1
MINDTY1
PFMDTY1
Efficiency1 (note 2)
EFFI1
CONDITIONS
VIN=3.0V, IOUT1=10mA
Same as IDD1
Same as IDD2
No Load, VPWM1=0V
IOUT1=250mA
P-ch MOSFET : XP162A12A6P
VOUT1 × 0.95V, EN1=0V→0.65V
10.0
Soft-Start Time1
TSS1
5.0
EXT1 "High" ON Resistance REXTBH1 EN1=0, EXT1=VDD-0.4V
28
EXT1 "Low" ON Resistance
REXTBL1 FB2=0V, EXT1=0.4V
22
PWM1 "High" Voltage
VPWMH1 No Load
0.65
PWM1 "Low" Voltage
VPWML1 No Load
Unless otherwise stated, VDD=EN1=PWM1=3.0V, PWM2=EN2=GND, EXT2=OPEN, FB2=OPEN, VIN=5.0V
Output 2 Characteristics
Step-down Controller
PARAMETER
SYMBOL
FB2 Voltage
Minimum Operation Voltage
Maximum Duty Ratio 2
Minimum Duty Ratio 2
PFM Duty Ratio 2
VFB2
VINmin2
MAXDTY2
MINDTY2
PFMDTY2
Efficiency2 (note 2)
EFFI2
CONDITIONS
VIN=3.0V, IOUT2=10mA
Same as IDD1
Same as IDD2
No Load, VPWM2=0V
IOUT2=250mA
P-ch MOSFET : XP162A12A6P
VOUT2 × 0.95V, EN2=0V→0.65V
MIN.
TYP.
MAX.
UNITS
TEST
CIRCUIT
0.882
100
22
0.900
30
0.918
2.0
0
38
V
V
%
%
%
6
1
2
2
7
-
91
-
%
7
20.0
47
30
0.20
mS
Ω
Ω
V
V
7
5
5
7
7
10.0
Soft-Start Time 2
TSS2
5.0
28
EXT2 "High" ON Resistance REXTBH2 EN2=0, EXT2=VDD-0.4V
EXT2 "Low" ON Resistance
REXTBL2 FB2=0V, EXT2=0.4V
22
PWM2 "High" Voltage
VPWMH2 No Load
0.65
PWM2 "Low" Voltage
VPWML2 No Load
Unless otherwise stated, VDD=EN2=PWM2=3.0V, PWM1=EN1=GND, EXT1=OPEN, FB1=OPEN, VIN=5.0V
Notes
TEST
CIRCUIT
MIN.
1) Please be careful not to exceed the breakdown voltage level of the peripheral parts.
2) EFFI={ [ (Output voltage) x (Output current) ] / [ (Input voltage) x (Input Current) ] } x 100
6
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Operational Description
The XC9503 series are multi-functional, 2 channel step-down DC/DC converter controller ICs with built-in high speed, low ON
resistance drivers.
<Error Amp 1, 2>
The Error Amplifier is designed to monitor the output voltage and it compares the feedback voltage (FB) with the reference
voltage. In response to feedback of a voltage lower than the reference voltage, the output voltage of the error amp. decreases.
<OSC Generator>
This circuit generates the Switching Frequency which in turn generates the reference clock.
<Ramp Wave Generator 1, 2>
The Ramp Wave Generator generates a saw-tooth waveform based on outputs from the Phase Shift Generator.
<PWM Comparator 1, 2>
The PWM Comparator compares outputs from the Error Amp. and saw-tooth waveform. When the voltage from the Error Amp's
output is low, the external switch will be set to ON.
<PWM/PFM Controller 1, 2>
This circuit generates PFM pulses.
Control can be switched between PWM control and PWM/PFM automatic switching control using 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).
<Vref with Soft Start 1, 2>
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.
<Chip Enable Function>
This function controls the operation and shutdown of the IC. When the voltage of the EN1 or EN2 pins is 0.2V or less, the mode
will be chip disable, the channel's operations will stop and the EXT pins will be kept at a 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 µA.
When the EN1 or EN2 pin's voltage is 0.65V or more, the mode will be chip enable and operations will recommence. With softstart, 95% of the set output voltage will be reached within 10mS (TYP) from the moment of chip enable.
7
XC9503 Series
2ch. Step-down DC/DC Controller ICs
<Setting of Output Voltage>
Output voltage can be set by adding external split resistors. Output voltage is determined by the following equation, based on
the values of RFB11(RFB21) and RFB12(RFB22). The sum of RFB11(RFB21) and RFB12(RFB22) should normally be 1 M Ω or
VOUT=0.9 × (RFB11+RFB12) /RFB12
The value of CFB1(CFB2), speed-up capacitor for phase compensation, should be fzfb= 1 / (2 × π × 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).
[Example of Calculation]
When RFB11=200kΩ and RFB12=75kΩ, VOUT1=0.9 × (200k+75k) / 75k=3.3V.
[Typical Example]
RFB11
RFB12
RFB11
VOUT
CFB1
VOUT
(V)
(pF)
(V)
(kΩ)
(kΩ)
(kΩ)
1.0
1.5
1.8
2.0
2.2
30
220
220
330
390
270
330
220
270
270
2.5
2.7
3.0
3.3
5.0
430
62
62
39
33
The same method can be adopted for channel two also.
[External Components]
Tr :
* MOSFET
XP162A12A6P (TOREX P-Channel Power MOSFET)
Note : VGS Breakdown Voltage of this Tr. is 12V
so please be careful with the power supply voltage.
SD :
MA2Q737 (Schottky , MATSUSHITA)
CMS02
(Schottky, TOSHIBA)
10µH
(SUMIDA, CDRH5D28, FOSC = 500kHz)
22µH
(SUMIDA, CDRH5D28, FOSC = 300kHz)
22µH
(SUMIDA, CDRH5D28, FOSC = 180kHz)
16V, 47µF (Tantalum)
Increase capacity according to the equation below
when the step-up voltage ratio is large and output
current is high.
L:
CL :
C=(CL standard value)×(IOUT (mA)/500mA×VOUT/VIN
Tr :
RB :
CB :
* PNP MOSFET
2SA1213 (SANYO)
500Ω ( Adjust in accordance with load & Tr.'s HFE.)
Set according to the equation below.
RB ≤ (VIN-0.7) x hFE / IC-REXTBH
2200pF (Ceramic)
Set according to the equation below.
CB ≤ (2 π x RB x FOSC x 0.7)
The same components can be adopted for both channel 1 and channel 2.
8
390
360
560
200
82
RFB12
(kΩ)
CFB1
(pF)
220
180
240
75
18
33
33
24
62
160
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Test Circuits
Circuit 1
Circuit 5
PNP
Tr1
L1
VOUT1
PNP
Tr2
N
1 EXT1
L2
V OUT2
5 10Ω
C IN
2 200pF
5 10Ω
22 00p F
VI
RFB21
SBD1
GND 9
SBD2
GND 9
3 FB1
FB2 8
4 PWM1
3 FB1
FB2 8
CL2
RL2
4 PWM1
VEXT1
1µ F
VPWM1
VDD
PWM2 7
5 EN1
VPWM2
EN2 6
VEXT2
PWM2 7
RFB12
RFB22
5 EN1
A
CFB2
1µF
CL1
RL1
2 VDD
EXT2 10
2 VDD
A
RFB11
CFB1
1 EXT1
CIN
EXT2 10
VFB1
EN2 6
VEN2
VEN1
VFB2
Circuit 6
Circuit 2
Pch
MOSFET2
1 EXT1
A
2 VDD
GND 9
3 FB1
FB2 8
4 PWM1
A
A
5 EN1
A
V IN
PWM2 7
EN2 6
A
A
OSC
A
1 EXT1
EXT2 10
2 VDD
GND 9
3 FB1
1µ F
4 PWM1
VFB1
VDD
VPWM1
VOUT2
A
OSC
A
L2
EXT2 10
VEN1
VEN2
VPWM2
VFB2
5 EN1
Circuit 3
SBD2
V
FB2 8
CL2
RL
PWM2 7
EN2 6
Circuit 7
L1
VOUT1
Pch
MOSFET2
Pch
MOSFET1
A
1 EXT1
EXT2 10
SBD1
VIN
GND 9
3 FB1
FB2 8
A
SBD2
VIN
1 EXT1
EXT2 10
200kΩ
CIN
2 VDD
VOUT2
A
CIN
A
L2
2 VDD
GND 9
62 pF
V
V
CL1
3 FB1
RL
4 PWM1
5 EN1
4 PWM1
PWM2 7
L1
Pch
MOSFET1
A
A
200kΩ
CL1
1 EXT1
62pF
V
SBD1
EXT2 10
VIN
CIN
2 VDD
GND 9
3 FB1
FB2 8
RL
75kΩ
4 PWM1
5 EN1
CL2
75kΩ
5 EN1
EN2 6
Circuit 4
VOUT1
FB2 8
PWM2 7
PWM2 7
EN2 6
9
EN2 6
RL
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Peripheral Components Used for Test Circuits
Circuit 1
L1, L2 :
SD1, SD2 :
CL1, CL2 :
CIN :
PNP Tr1, 2:
RFB :
CFB :
22µH (SUMIDA CDRH5D28) : XC9503B092A
15µH (SUMIDA CDRH5D28) : XC9503B093A
10µH (SUMIDA CDRH5D28) : XC9503B095A
CRS02 (Schottky diode, TOSHIBA)
EC10QS06 (Schottky diode, NIHON INTER)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
2SA1213 (TOSHIBA)
Please use by the conditions as below.
RFB11 + RFB12 ≤ 1MΩ
RFB21 + RFB22 ≤ 1MΩ
RFB11 / RFB12 = (Setting Output Voltage / 0.9) -1
VOUT2=(0.9-VOUT1) X (RFB21/RFB22) + 0.9V
Please adjust as below:
fzfb=1/(2 x π x CFB1 x RFB11) = 1kHz ~50kHz ( 12kHz usual)
fzfb=1/(2 x π x CFB2 x RFB21) = 1kHz ~50kHz ( 12kHz usual)
Circuits 3
L1 :
SD1 :
CL1 :
CIN :
P-ch MOSFET1 :
22µH (SUMIDA CDRH5D28)
MA2Q737 (Schottky diode, MATSUSHITA)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
XP161A12A6P (TOREX)
Circuits 4
L1 :
SD1 :
CL1 :
CIN :
P-ch MOSFET1 :
22µH (SUMIDA CDRH5D28) : XC9503B092A
15µH (SUMIDA CDRH5D28) : XC9503B093A
10µH (SUMIDA CDRH5D28) : XC9503B095A
MA2Q737 (Schottky, MATSUSHITA)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
XP161A12A6P (TOREX)
Circuit 6
L1 :
SD1 :
CL1 :
CIN :
P-ch MOSFET2 :
22µH (SUMIDA CDRH5D28)
MA2Q737 (Schottky diode, MATSUSHITA)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
XP162A12A6P (TOREX)
Circuit 7
L2 :
SD2 :
CL2 :
CIN :
P-ch MOSFET2 :
22µH (SUMIDA CDRH5D28) : XC9503B092A
15µH (SUMIDA CDRH5D28) : XC9503B093A
10µH (SUMIDA CDRH5D28) : XC9503B095A
MA2Q737 (Schottky, MATSUSHITA)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
16MCE476MD2 (Tantalum, NIHON CHEMICON)
XP161A12A6P (TOREX)
10
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Notes on Use
1. Checking for Intermittent Oscillation
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.
2. PWM/PFM Automatic Switching
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.
3. Ratings
Use the XC9503 series and peripheral components within the limits of their ratings.
11
XC9503 Series
2ch. Step-down DC/DC Controller ICs
Typical Performance Characteristics
(1) Output Voltage vs. Output Current
FOSC=300kHz, VOUT1, 2=1.0V
FOCS=300kHz, VOUT1, 2=1.0V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
1.2
PWM Control
Output Voltage1, 2 VOUT1, 2 (V)
Output Voltage1, 2 VOUT1, 2 (V)
1.2
1.1
1.0
0.9
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
0.8
0.7
PWM/PFM Switching Control
1.1
1.0
0.9
1
10
100
0.8
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=300kHz, VOUT1, 2=1.8V
FOSC=300kHz, VOUT1, 2=1.8V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
2.0
Output Voltage1, 2 VOUT1, 2 (V)
PWM/PFM Switching Control
1.9
1.8
1.7
VIN= 2.7V 3.3V 4.2V
5.0V 6.0V 8.0V 10V
1.6
1000
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
2.0
PWM Control
Output Voltage1, 2 VOUT1, 2 (V)
4.2V, 6.0V 8.0V 10.0V
0.7
0.1
1.5
1.9
6.0V 8.0V 10.0V
1.8
1.7
VIN= 2.7V 3.3V 4.2V 5.0V
1.6
1.5
0.1
1
10
100
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=300kHz, VOUT1, 2=2.5V
FOSC=300kHz, VOUT1, 2=2.5V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
2.7
Output Voltage1, 2 VOUT1, 2 (V)
PWM/PFM Switching Control
2.6
10.0V
2.5
2.4
VIN= 2.7V 3.3V 4.2V
5.0V 6.0V 8.0V
2.3
1000
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
2.7
PWM Control
Output Voltage1, 2 VOUT1, 2 (V)
VIN=2.7V 3.3V
5.0V
2.2
10.0V
2.6
8.0V
2.5
2.4
3.3V 4.2V 5.0V 6.0V
2.3
VIN=2.7V
2.2
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
12
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(1) Output Voltage vs. Output Current (continued)
FOSC=300kHz, VOUT1, 2=3.3V
FOSC=300kHz, VOUT1, 2=3.3V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
3.5
3.5
PWM/PFM Switching Control
Output Voltage1, 2 VOUT1, 2 (V)
Output Voltage1, 2 VOUT1, 2 (V)
PWM Control
VIN=4.2V 5.0V 6.0V 8.0V
3.4
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
3.3
10.0V
3.2
3.1
3.0
3.4
VIN=4.2V 5.0V 6.0V 8.0V
3.3
3.2
10.0V
3.1
3.0
0.1
1
10
100
1000
0.1
FOSC=300kHz, VOUT1, 2=5.0V
1000
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.2
PWM/PFM Switching Control
Output Voltage1, 2 VOUT1, 2 (V)
Output Voltage1, 2 VOUT1, 2 (V)
100
FOSC=300kHz, VOUT1, 2=5.0V
PWM Control
10.0V
5.1
5.0
VIN= 6.0V 8.0V
4.9
4.8
4.7
10.0V
5.1
5.0
VIN= 6.0V 8.0V
4.9
4.8
4.7
0.1
1
10
100
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=180kHz, VOUT1, 2=1.0V
FOSC=180kHz, VOUT1, 2=1.0V
L=47µH(CDRH6D38), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
1.2
Output Voltage1, 2 VOUT1, 2 (V)
PWM/PFM Switching Control
1.1
10.0V
1.0
0.9
1000
L=47µH(CDRH6D38), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
1.2
PWM Control
Output Voltage1, 2 VOUT1, 2 (V)
10
Output Current1, 2 IOUT1, 2 (mA)
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.2
1
Output Current1, 2 IOUT1, 2 (mA)
VIN=2.7V 3.3V 4.2V
5.0V 6.0V 8.0V
0.8
1.1
10.0V
1.0
0.9
4.2V 5.0V 6.0V 8.0V
VIN=2.7V 3.0V
0.8
0.7
0.7
0.1
0.1
1
10
100
1000
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
13
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(1) Output Voltage vs. Output Current (continued)
FOSC=180kHz, VOUT1, 2=3.3V
L=47µH(CDRH6D38), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
3.5
L=47µH(CDRH6D38), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
5.2
PWM/PFM Switching Control
PWM Control
Output Voltage1, 2 VOUT1, 2 (V)
Output Voltage1, 2 VOUT1, 2 (V)
FOSC=180kHz, VOUT1, 2=5.0V
3.4
3.3
3.2
VIN=4.2V 5.0V 6.0V 8.0V 10V
3.1
3.0
PWM/PFM Switching Control
PWM Control
5.1
5.0
4.9
VIN= 6.0V 8.0V 10V
4.8
4.7
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
FOSC=500kHz, VOUT1, 2=1.0V
Output Voltage1, 2 VOUT1, 2 (V)
Output Voltage1, 2 VOUT1, 2 (V)
1.1
1.0
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
0.8
0.7
1000
PWM/PFM Switching Control
VIN=2.7V 3.3V 4.2V 5.0V
1.1
1.0
0.9
6.0V 8.0V 10.0V
0.8
0.7
0.1
1
10
100
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=500kHz, VOUT1, 2=3.3V
FOSC=500kHz, VOUT1, 2=3.3V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
3.5
PWM Control
3.4
3.3
VIN=4.2V 5.0V 6.0V 8.0V 10V
3.2
3.1
3.0
1000
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
3.5
Output Voltage1, 2 VOUT1, 2 (V)
Output Voltage1, 2 VOUT1, 2 (V)
100
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
1.2
PWM Control
0.9
10
FOSC=500kHz, VOUT1, 2=1.0V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
1.2
1
Output Current1, 2 IOUT1, 2 (mA)
PWM/PFM Switching Control
10.0V
3.4
3.3
VIN=4.2V 5.0V 6.0V 8.0V
3.2
3.1
3.0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
14
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(1) Output Voltage vs. Output Current (continued)
FOSC=500kHz, VOUT1, 2=5.0V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
Output Voltage1, 2 VOUT1, 2 (V)
5.2
PWM/PFM Switching Control
PWM Control
5.1
5.0
VIN= 6.0V 8.0V 10V
4.9
4.8
4.7
0.1
1
10
100
1000
Output Current1, 2 IOUT1, 2 (mA)
15
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(2) Efficiency vs. Output Current
FOSC=300kHz, VOUT1, 2=1.0V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
PWM Control
80
60
4.2V
3.3V
40
VIN=2.7V
20
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
PWM Control
Efficiency1, 2 EFFI1, 2 (%)
Efficiency1, 2 EFFI1, 2 (%)
FOSC=300kHz, VOUT1, 2=1.0V
10.0V
80
8.0V
6.0V
60
40
20
VIN=5.0V
0
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
Efficiency1, 2 EFFI1, 2 (%)
Efficiency1, 2 EFFI1, 2 (%)
VIN= 2.7V
60
3.3V
4.2V
20
1000
80
10.0V
60
VIN=5.0V
8.0V
40
6.0V
20
0
0
0.1
1
10
100
0.1
1000
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=300kHz, VOUT1, 2=2.5V
FOSC=300kHz, VOUT1, 2=2.5V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
80
VIN=2.7V
60
3.3V
40
4.2V
20
PWM/PFM Switching Control
PWM Control
1
10
100
PWM/PFM Switching Control
PWM Control
80
10V
60
VIN=5.0V
40
8.0V
6.0V
20
0
0
0.1
1000
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
Efficiency1, 2 EFFI1, 2 (%)
100
Efficiency1, 2 EFFI1, 2 (%)
100
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
80
40
10
FOSC=300kHz, VOUT1, 2=1.8V
FOSC=300kHz, VOUT1, 2=1.8V
100
1
Output Current1, 2 IOUT1, 2 (mA)
0.1
1000
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
16
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(2) Efficiency vs. Output Current (continued)
FOSC=300kHz, VOUT1, 2=3.3V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
80
10.0V
60
8.0V
40
6.0V
VIN=4.2V 5.0V
20
0
1
10
100
1000
80
60
10.0V
40
8.0V
20
VIN=6.0V
0.1
1
10
100
1000
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=180kHz, VOUT1, 2=1.0V
FOSC=180kHz, VOUT1, 2=1.0V
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
PWM/PFM Switching Control
PWM Control
VIN=5.0V
80
60
4.2V
40
3.3V
VIN=2.7V
20
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
Efficiency1, 2 EFFI1, 2 (%)
Efficiency1, 2 EFFI1, 2 (%)
PWM/PFM Switching Control
PWM Control
0
0.1
100
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
PWM Control
Efficiency1, 2 EFFI1, 2 (%)
Efficiency1, 2 EFFI1, 2 (%)
FOSC=300kHz, VOUT1, 2=5.0V
80
8.0V
60
6.0V
40
10V
20
PWM/PFM Switching Control
PWM Control
0
0
0.1
1
10
100
0.1
1000
1
10
100
1000
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=180kHz, VOUT1, 2=3.3V
FOSC=180kHz, VOUT1, 2=5.0V
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
Efficiency1, 2 EFFI1, 2 (%)
Efficiency1, 2 EFFI1, 2 (%)
5.0V
80
VIN=4.2V
10V
60
8.0V
6.0V
40
20
80
10V
60
8.0V
VIN=6.0V
40
20
PWM/PFM Switching Control
PWM Control
PWM/PFM Switching Control
PWM Control
0
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
17
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(2) Efficiency vs. Output Current (continued)
FOSC=500kHz, VOUT1, 2=1.0V
PWM/PFM Switching Control
PWM Control
80
60
4.2V
40
3.3V
20
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
Efficiency1, 2 EFFI1, 2 (%)
Efficiency1, 2 EFFI1, 2 (%)
100
FOSC=500kHz, VOUT1, 2=1.0V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
VIN=2.7V
0
PWM/PFM Switching Control
PWM Control
80
VIN=5.0V
60
10V
40
8.0V
6.0V
20
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
FOSC=500kHz, VOUT1, 2=3.3V
Efficiency1, 2 EFFI1, 2 (%)
Efficiency1, 2 EFFI1, 2 (%)
100
PWM/PFM Switching Control
PWM Control
80
10.0V
8.0V
60
6.0V
40
5.0V
VIN=4.2V
20
10
100
1000
FOSC=500kHz, VOUT1, 2=3.3V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
1
Output Current1, 2 IOUT1, 2 (mA)
0
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
PWM/PFM Switching Control
PWM Control
80
60
10.0V
40
8.0V
VIN=6.0V
20
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
18
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(3) Ripple Voltage vs. Output Current
FOSC=300kHz, VOUT1, 2=1.0V
FOSC=300kHz, VOUT1, 2=1.0V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
80
Ripple Voltage1, 2 (mV)
Ripple Voltage1, 2 (mV)
PWM Control
60
VIN=2.7V 3.3V 5.0V 6.0V
40
8.0V 10V
4.2V
20
0
80
VIN=2.7V
60
40
6.0V 5.0V 10V 4.2V
20
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
1000
PWM/PFM Switching Control
80
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
40
20
Ripple Voltage1, 2 (mV)
Ripple Voltage1, 2 (mV)
100
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM Control
60
10
FOSC=300kHz, VOUT1, 2=1.8V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
1
Output Current1, 2 IOUT1, 2 (mA)
FOSC=300kHz, VOUT1, 2=1.8V
0
80
60
5.0V 4.2V
10V 8.0V 6.0V
3.3V VIN=2.7V
40
20
0
0.1
1
10
100
1000
0.1
1
10
100
1000
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=300kHz, VOUT1, 2=2.5V
FOSC=300kHz, VOUT1, 2=2.5V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
Ripple Voltage1, 2 (mV)
PWM/PFM Switching Control
80
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
60
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM Control
Ripple Voltage1, 2 (mV)
8.0V 3.3V
40
20
80
60
VIN=2.7V
10V 8.0V 6.0V 5.0V 4.2V
40
3.3V
20
0
0
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
19
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(3) Ripple Voltage vs. Output Current (continued)
FOSC=300kHz, VOUT1, 2=3.3V
FOSC=300kHz, VOUT1, 2=3.3V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
80
Ripple Voltage1, 2 (mV)
Ripple Voltage1, 2 (mV)
PWM Control
VIN=4.2V 5.0V 6.0V
8.0V 10V
60
40
20
80
60
VIN=4.2V 5.0V 6.0V
40
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
10
100
1000
FOSC=300kHz, VOUT1, 2=5.0V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
1
Output Current1, 2 IOUT1, 2 (mA)
FOSC=300kHz, VOUT1, 2=5.0V
L=22µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
80
60
VIN=6.0V
40
8.0V
10V
20
Ripple Voltage1, 2 (mV)
PWM Control
Ripple Voltage1, 2 (mV)
10.0V
20
0
80
60
40
VIN=6.0V
10.0V
8.0V
20
0
0
0.1
1
10
100
0.1
1000
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=180kHz, VOUT1, 2=1.0V
FOSC=180kHz, VOUT1, 2=1.0V
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
40
20
0
Ripple Voltage1, 2 (mV)
80
60
1000
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM Control
Ripple Voltage1, 2 (mV)
8.0V
80
60
VIN=2.7V
40
4.2V 10V 5.0V 6.0V
20
8.0V
3.3V
0
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
20
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(3) Ripple Voltage vs. Output Current (continued)
FOSC=180kHz, VOUT1, 2=3.3V
FOSC=180kHz, VOUT1, 2=3.3V
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM Control
PWM/PFM Switching Control
60
10V
40
8.0V
5.0V
20
VIN=4.2V 6.0V
80
Ripple Voltage1, 2 (mV)
Ripple Voltage1, 2 (mV)
80
60
40
VIN=4.2V 5.0V
10V
0
0.1
1
10
100
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=180kHz, VOUT1, 2=5.0V
FOSC=180kHz, VOUT1, 2=5.0V
L=47µH(CDRH6D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
1000
L=47µH(CDRH6D28), CL=94µF(Tantaium)
SD:CMS02, Tr:XP162A12A6P
100
PWM Control
PWM/PFM Switching Control
80
Ripple Voltage1, 2 (mV)
Ripple Voltage1, 2 (mV)
8.0V
20
0
60
40
10V
8.0V
VIN=6.0V
20
0
80
60
40
VIN=6.0V
8.0V
10V
20
0
0.1
1
10
100
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
Output Current1, 2 IOUT1, 2 (mA)
FOSC=500kHz, VOUT1, 2=1.0V
FOSC=500kHz, VOUT1, 2=1.0V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
Ripple Voltage1, 2 (mV)
80
60
1000
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM Control
Ripple Voltage1, 2 (mV)
6.0V
VIN=2.7V 3.3V 4.2V 5.0V
6.0V 8.0V 10V
40
20
80
60
VIN=2.7V
40
8.0V 10V 5.0V 6.0V
4.2V
3.3V
20
0
0
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
1000
0.1
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
* When setting VOUT1, 2 =1.0V, VIN=8.0V, 10.0V,
CL should be 94µF (Tantalum) + 100µF (OS-COM)
21
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(3) Ripple Voltage vs. Output Current (continued)
FOSC=500kHz, VOUT1, 2=3.3V
FOSC=500kHz, VOUT1, 2=3.3V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM/PFM Switching Control
80
60
8.0V 10V
6.0V
40
5.0V
VIN=4.2V
Ripple Voltage1, 2 (mV)
Ripple Voltage1, 2 (mV)
PWM Control
20
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
0
80
60
VIN=4.2V
5.0V
40
10V
20
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
10
100
1000
FOSC=500kHz, VOUT1, 2=5.0V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
1
Output Current1, 2 IOUT1, 2 (mA)
FOSC=500kHz, VOUT1, 2=5.0V
L=10µH(CDRH5D28), CL=94µF(Tantalum)
SD:CMS02, Tr:XP162A12A6P
100
PWM Control
PWM/PFM Switching Control
80
60
40
10V
8.0V
VIN=6.0V
20
Ripple Voltage1, 2 (mV)
Ripple Voltage1, 2 (mV)
8.0V
6.0V
0
80
60
40
VIN=6.0V
8.0V
10V
20
0
0.1
1
10
100
1000
0.1
Output Current1, 2 IOUT1, 2 (mA)
1
10
100
Output Current1, 2 IOUT1, 2 (mA)
22
1000
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(4) Supply Current 1 vs. Supply Voltage
(5) Supply Current 1_1 vs. Supply Voltage
XC9503B092 (180KHz)
250
Topr=85OC
25OC
- 40OC
200
Suppy Current 1-1 IDD1-1 (µA)
Supply Current 1 IDD1 (µA)
250
XC9503B092 (180KHz)
150
100
50
0
Topr=85OC
25OC
- 40OC
200
150
100
50
0
0
2
4
6
8
10
0
Supply Voltage VDD (V)
Supply Current 2 IDD2 (µA)
Supply Current 1-2 IDD1-2 (µA)
250
Topr=85OOC
C
Topr=85
O
25
OC
25 OC
C
40OC
-- 40
100
50
0
Topr=85OC
25OC
- 40OC
200
150
100
50
2
4
6
8
10
0
2
Supply Voltage VDD (V)
Oscillaltion Frequency Fosc (kHz)
Stand-by Curret ISTB (µA)
6
4
2
0
6
8
10
XC9503B093(180kHz)
Topr=85OC
25OC
- 40OC
4
6
(9) Oscillation Frequency vs. Supply Voltage
XC9503B092 (180KHz)
2
4
Supply Voltage VDD (V)
(8) Stand-by Current vs. Supply Voltage
0
10
0
0
8
8
XC9503B092 (180KHz)
150
10
6
(7) Supply Current 2 vs. Supply Voltage
XC9503B092 (180KHz)
200
4
Supply Voltage VDD (V)
(6) Supply Current 1_2 vs. Supply Voltage
250
2
8
10
360
330
300
270
240
0
Suppy Voltage VDD (V)
2
4
6
8
Supply Voltage VDD (V)
23
10
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(10) EN1, 2 'High' 'Low' Voltage vs. Supply Voltage
(11) PWM1, 2 'High' 'Low' Voltage vs. Supply Voltage
XC9503B093 (300KHz)
0.8
PWM1, 2 'H' 'L' Voltage V PWM1 , 2 (V)
EN1, 2 'H' 'L' Voltage VEN1, 2(V)
XC9503B093 (300KHz)
0.6
- 40OC
0.4
85OC
Topr=25OC
0.2
0
0
2
4
6
8
0.8
0.6
- 40OC
0.4
85OC
O
Topr=25 C
0.2
0
10
0
2
Supply Voltage VDD (V)
L=22µH(CDRH5D28), CL=94µF (Tantalum)
SD:CMS02 Tr:XP162A12A6
3.5
Topr=85OC
25OC
- 40OC
Output Voltage VOUT1, 2 (V)
PFM duty ratio 1, 2 (%)
10
XC9503B093(300kHz)
30
25
20
3.4
3.3
3.2
VIN=5.0V
IOUT1, 2 =200mA
3.1
3.0
0
2
4
6
8
10
0
2
Supply Voltage VDD (V)
EXT1, 2 'Low' ON Resistance (Ω)
30
20
10
0
0
2
4
6
8
10
XC9503B092 (180KHz)
Topr=85OC
25OC
- 40OC
40
6
(14) EXT1, 2 'Low' On Resistance vs. Supply Voltage
XC9503B092 (180KHz)
50
4
Supply Voltage VDD (V)
(14) EXT1, 2 'High' On Resistance vs. Supply Voltage
EXT1, 2 'High' On Resistance (Ω)
8
(13) Output Voltage vs. Ambient Temperature
XC9503B093(300kHz)
35
6
Supply Voltage VDD (V)
(12) PFM duty ratio 1, 2 vs. Supply Voltage
40
4
8
50
Topr=85OC
25OC
- 40OC
40
30
20
10
0
0
10
2
4
6
Supply Voltage VDD (V)
Supply Voltage VDD (V)
24
8
10
XC9503 Series
2ch. Step-down DC/DC Controller ICs
(16) Soft Start Time 1, 2 vs. Supply Voltage
Soft Start Time 1, 2 TSS1, 2 (msec)
XC9503B092 (180KHz)
25
20
15
10
5
0
0
2
4
6
8
10
Supply Voltage VDD (V)
25
XC9503 Series
2ch. Step-down DC/DC Controller ICs
! Load Transient Response
< VOUT1, 2 = 3.3 V, VIN = 5.0V
IOUT1, 2 = 100µA ! 300mA >
" PWM Control
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 100µA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 300mA " 100µA
3.3V
3.3V
CH1
300mA
CH2
100µA
300mA
CH2
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH2 : IOUT1, 2, 150mA/div
100µA
10msec / div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
" PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 100µA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 300mA " 100µA
3.3V
CH1
3.3V
300mA
CH2
100µA
300mA
CH2
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH2 : IOUT1, 2, 150mA/div
100µA
10msec / div
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH2 : IOUT1, 2, 150mA/div
26
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
VIN = 5.0V, IOUT = 1, 2 = 10mA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 300mA " 10mA
3.3V
3.3V
CH1
300mA
CH2
10mA
300mA
CH2
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
10mA
400µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
" PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 10mA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 300mA " 10mA
3.3V
CH1
3.3V
300mA
CH2
10mA
300mA
CH2
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 100mV/div
CH2 : IOUT1, 2, 150mA/div
10mA
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
27
XC9503 Series
2ch. Step-down DC/DC Controller ICs
! Load Transient Response
< VOUT1, 2 = 0.9 V, VIN = 3.3V
IOUT1, 2 = 100µA ! 300mA >
" PWM Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 100µA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 300mA " 100µA
0.9V
CH1
0.9V
300mA
CH2
100µA
300mA
CH2
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
100µA
4msec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
" PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 100µA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 300mA " 100µA
0.9V
CH1
0.9V
300mA
CH2
100µA
300mA
CH2
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
100µA
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 50mV/div
CH2 : IOUT1, 2, 150mA/div
28
XC9503 Series
2ch. Step-down DC/DC Controller ICs
! Load Transient Response
< VOUT1, 2 = 0.9 V, VIN = 3.3V
IOUT1, 2 = 10mA ! 300mA >
" PWM Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 10mA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 300mA " 10mA
0.9V
CH1
0.9V
300mA
CH2
300mA
10mA
CH2
100µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
10mA
100µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
" PWM / PFM Switching Control
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 10mA " 300mA
CH1
FOSC = 300kHz, VOUT1, 2 = 0.9V
VIN = 3.3V, IOUT = 1, 2 = 300mA " 10mA
0.9V
CH1
0.9V
300mA
CH2
300mA
10mA
CH2
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
10mA
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 150mA/div
29
XC9503 Series
2ch. Step-down DC/DC Controller ICs
! Load Transient Response
< PWM Control ! PWM / PFM Switching Control >
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 5mA PWM1, 2 'Low' " 'High'
CH1
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 5mA PWM1, 2 'HIgh' " 'Low'
3.3V
CH1
3.3V
0.65V
CH2
0.65V
0V
CH2
400µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 10mV/div
CH2 : IOUT1, 2, 0.5V/div
0V
200µsec / div
CH1 : VOUT1, 2, AC-COUPLED, 20mV/div
CH2 : IOUT1, 2, 0.5V/div
< Soft Start Wave Form >
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 300mA EN1, 2 'Low' " 'High'
CIN=47µF
FOSC = 300kHz, VOUT1, 2 = 3.3V
VIN = 5.0V, IOUT = 1, 2 = 100mA EN1, 2 'Low' " 'High'
CIN=47µF
3.3V
3.3V
CH1
CH1
200mA
75mA
CH2
CH2
0.65V
0.65V
CH3
CH3
4msec / div
CH1 : VOUT1, 2, 2.0V/div
CH2 : IIN1, 2, 100mA/div
CH3 : EN1, 2, 0.5V/div
4msec / div
CH1 : VOUT1, 2, 2.0V/div
CH2 : IIN1, 2, 50mA/div
CH3 : EN1, 2, 0.5V/div
* CH1 : EN2=GND when measurement
CH2 : EN1=GND when measurement
30