PWM/VFM step-down DC/DC Converter
NO. EA-097-0212
OUTLINE
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R1225N
BLOCK DIAGRAM
OSC
Start
func
VIN
EXT
+
Amp
+
PWM/VFM
CONTROL
Vref
Soft Start
Protection
Chip Enable
+
DLY
VOUT
UVLO
CE
Vref
-
GND
SELECTION GUIDE
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Code
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Contents
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R1225N
PIN CONFIGURATION
SOT-23-6W
6
5
4
VOUT
GND
CE
(mark side)
EXT
VIN
DLY
1
2
3
PIN DESCRIPTION
Pin No.
Symbol
Description
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ABSOLUTE MAXIMUM RATINGS
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R1225N
ELECTRICAL CHARACTERISTICS
• R1225Nxx2X (X=A/B/C/D/J/K)
Symbol
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R1225N
TYPICAL APPLICATION AND APPLICATION HINTS
L
PMOS
R1
C1
VIN
EXT
VOUT
CE
GND
DLY
C2
SD
C4
+
-
C3
LOAD
CE CONTROL
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6 GPE'-+P@;F
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R1225N
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6
R1225N
How to set the delay time of protection circuit
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PMOS
C1
R1
EXT
VIN
GND
CE
C2
VOUT
+
-
SD
DLY
C3
LOAD
C4
CE CONTROL
OPERATION of step-down DC/DC converter and Output Current
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topen
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ton
toff
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R1225N
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R1225N
OUTPUT CURRENT AND SELECTION OF EXTERNAL COMPONENTS
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9
R1225N
External Components
1.
Inductor
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2.
Diode
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Capacitors
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Lx Transistor
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10
R1225N
TIMING CHART
Case 1. Set VOUT Voltage >2.1V (Set VOUT Voltage>UVLO Voltage)
VOUT Set Output Voltage
VIN
UVLO Voltage
Input Voltage
Rising Time
CE
UVLO Reset
VOUT Set Output Voltage
CE Reset
Protection Circuit Delay Time
Protection Circuit Delay Time
VOUT Set Output Voltage
EXT
Latch Protection
Latch Protection
VOUT Set Output Voltage
VOUT
Stable Operation
Soft Start
Stable Operation
Soft Start
Stable Operation
Soft Start
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11
R1225N
Case 2. Set VOUT Voltage ≤ 2.0V (Set VOUT Voltage < UVLO Voltage)
UVLO Voltage
VIN
VOUT Set Output Voltage
UVLO Reset
Input Voltage
Rising Time
UVLO Voltage
CE
Reset with CE
Protection Circuit Delay Time
UVLO Voltage
EXT
Latch Protection
VOUT Set Output Voltage
VOUT
Stable Operation
Stable Operation
Soft Start
Soft Start
Stable Operation
Soft Start
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12
R1225N
TEST CIRCUITS
A) Output Voltage, Oscillator Frequency, CE “H” Input Voltage, CE “L” Input Voltage, Soft-start time
L1
Oscilloscope
D1
+
-
V
VIN
GND
DLY
VOUT
CE
+
-
C2
C) Standby Current
EXT
VIN
GND
VOUT
A
EXT
VIN
DLY
GND
DLY
CE
VOUT
CE
D) EXT “H” Output Current
F)
EXT
C1
B) Supply Current 1
A
PMOS
E)
EXT
VIN
GND
DLY
VOUT
CE
A
EXT “L” Output Current
A
EXT
VIN
GND
DLY
VOUT
CE
DLY Switch Current
EXT
VIN
GND
DLY
VOUT
CE
A
13
R1225N
G) CE “H” Input Current, CE “L” Input Current
EXT
VIN
GND
DLY
VOUT
CE
Oscilloscope
A
G;1E; F
$
G:=$E
-F
GP@/E# &'-(!F
H) Output Delay Time for Protection Circuit
EXT
VIN
GND
DLY
VOUT
CE
C3
+
-
C2
6 G$PE'-+P@;F
GP@/E# &'-(!F
G#/E-(!F
TYPICAL CHARACTERISTICS
1&-
&& )-2! )
&&
"#, +
) )
1)
Efficiency vs. Output Current
R1225N182A (VIN=5.0V) CDRH127-10uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N182A (VIN=3.3V) CDRH127-10uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT (mA)
90
80
80
Efficiency η(%)
Efficiency η(%)
100
90
70
60
50
40
30
40
30
10
Output Current IOUT (mA)
14
50
10
1000
10000
60
20
100
1000
70
20
10
100
R1225N182B (VIN=5.0V) CDRH127-10uH
100
1
10
Output Current IOUT (mA)
R1225N182B (VIN=3.3V) CDRH127-10uH
0
0.1
1
10000
0
0.1
1
10
100
1000
Output Current IOUT (mA)
10000
R1225N
R1225N182C (VIN=5.0V) CDRH127-10uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N182C (VIN=3.3V) CDRH127-10uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT (mA)
100
90
90
80
80
70
60
50
40
30
40
30
10
1000
0
0.1
10000
Output Current IOUT (mA)
90
80
80
Efficiency η(%)
Efficiency η(%)
100
90
70
60
50
40
30
40
30
10
Output Current IOUT (mA)
10000
50
20
1000
1000
60
10
100
100
70
20
10
10
R1225N182D (VIN=12V) CDRH127-10uH
100
1
1
Output Current IOUT (mA)
R1225N182D (VIN=5.0V) CDRH127-10uH
0
0.1
10000
50
20
100
1000
60
10
10
100
70
20
1
10
R1225N182D (VIN=3.3V) CDRH127-10uH
100
Efficiency η(%)
Efficiency η(%)
R1225N182C (VIN=12V) CDRH127-10uH
0
0.1
1
Output Current IOUT (mA)
10000
0
0.1
1
10
100
1000
10000
Output Current IOUT (mA)
15
R1225N
R1225N182J (VIN=5.0V) CDRH127-27uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N182J (VIN=3.3V) CDRH127-27uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT (mA)
100
90
90
80
80
70
60
50
40
30
40
30
10
1000
0
0.1
10000
Output Current IOUT (mA)
90
80
80
Efficiency η(%)
Efficiency η(%)
100
90
70
60
50
40
30
16
40
30
10
Output Current IOUT (mA)
10000
50
20
1000
1000
60
10
100
100
70
20
10
10
R1225N332A (VIN=4.8V) CDRH127-10Uh
100
1
1
Output Current IOUT (mA)
R1225N182K (VIN=12V) CDRH127-27uH
0
0.1
10000
50
20
100
1000
60
10
10
100
70
20
1
10
R1225N182K (VIN=5.0V) CDRH127-27uH
100
Efficiency η(%)
Efficiency η(%)
R1225N182K (VIN=3.3V) CDRH127-27uH
0
0.1
1
Output Current IOUT (mA)
10000
0
0.1
1
10
100
1000
Output Current IOUT (mA)
10000
R1225N
R1225N332B (VIN=4.8V) CDRH127-10uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N332A (VIN=7.0V) CDRH127-10uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT(mA)
100
90
90
80
80
70
60
50
40
30
40
30
10
1000
0
0.1
10000
Output Current IOUT(mA)
90
80
80
Efficiency η(%)
Efficiency η(%)
100
90
70
60
50
40
30
40
30
10
Output Current IOUT(mA)
10000
50
20
1000
1000
60
10
100
100
70
20
10
10
R1225N332C (VIN=15V) CDRH127-10uH
100
1
1
Output Current IOUT(mA)
R1225N332C (VIN=12V) CDRH127-10uH
0
0.1
10000
50
10
100
1000
60
20
10
100
70
20
1
10
R1225N332C (VIN=4.8V) CDRH127-10uH
100
Efficiency η(%)
Efficiency η(%)
R1225N332B (VIN=7.0V) CDRH127-10uH
0
0.1
1
Output Current IOUT(mA)
10000
0
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
17
R1225N
R1225N332D (VIN=12V) CDRH127-10uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N332D (VIN=4.8V) CDRH127-10uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT(mA)
100
90
90
80
80
70
60
50
40
30
40
30
10
1000
0
0.1
10000
Output Current IOUT(mA)
90
80
80
Efficiency η(%)
Efficiency η(%)
100
90
70
60
50
40
30
18
40
30
10
Output Current IOUT(mA)
10000
50
20
1000
1000
60
10
100
100
70
20
10
10
R1225N332K (VIN=15V) CDRH127-27uH
100
1
1
Output Current IOUT(mA)
R1225N332K (VIN=12V) CDRH127-27uH
0
0.1
10000
50
10
100
1000
60
20
10
100
70
20
1
10
R1225N332K (VIN=4.8V) CDRH127-27uH
100
Efficiency η(%)
Efficiency η(%)
R1225N332D (VIN=15V) CDRH127-10uH
0
0.1
1
Output Current IOUT(mA)
10000
0
0.1
1
10
100
1000
Output Current IOUT(mA)
10000
R1225N
R1225N502A (VIN=10V) CDRH127-10uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N502A (VIN=6.5V) CDRH127-10uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT(mA)
100
90
90
80
80
70
60
50
40
30
40
30
10
1000
0
0.1
10000
Output Current IOUT(mA)
90
80
80
Efficiency η(%)
Efficiency η(%)
100
90
70
60
50
40
30
40
30
10
Output Current IOUT(mA)
10000
50
20
1000
1000
60
10
100
100
70
20
10
10
R1225N502C (VIN=12V) CDRH127-10uH
100
1
1
Output Current IOUT(mA)
R1225N502C (VIN=6.5V) CDRH127-10uH
0
0.1
10000
50
10
100
1000
60
20
10
100
70
20
1
10
R1225N502B (VIN=10V) CDRH127-10uH
100
Efficiency η(%)
Efficiency η(%)
R1225N502B (VIN=6.5V) CDRH127-10uH
0
0.1
1
Output Current IOUT(mA)
10000
0
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
19
R1225N
R1225N502D (VIN=6.5V) CDRH127-10uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N502C (VIN=15V) CDRH127-10uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT(mA)
100
90
90
80
80
70
60
50
40
30
40
30
10
1000
0
0.1
10000
Output Current IOUT(mA)
90
80
80
Efficiency η(%)
Efficiency η(%)
100
90
70
60
50
40
30
20
40
30
10
Output Current IOUT(mA)
10000
50
20
1000
1000
60
10
100
100
70
20
10
10
R1225N502J (VIN=10V) CDRH127-27uH
100
1
1
Output Current IOUT(mA)
R1225N502J (VIN=6.5V) CDRH127-27uH
0
0.1
10000
50
10
100
1000
60
20
10
100
70
20
1
10
R1225N502D (VIN=15V) CDRH127-10uH
100
Efficiency η(%)
Efficiency η(%)
R1225N502D (VIN=12V) CDRH127-10uH
0
0.1
1
Output Current IOUT(mA)
10000
0
0.1
1
10
100
1000
Output Current IOUT(mA)
10000
R1225N
R1225N502K (VIN=12V) CDRH127-27uH
100
100
90
90
80
80
Efficiency η(%)
Efficiency η(%)
R1225N502K (VIN=6.5V) CDRH127-27uH
70
60
50
40
30
70
60
50
40
30
20
20
10
10
0
0.1
1
10
100
1000
0
0.1
10000
Output Current IOUT(mA)
1
10
100
1000
10000
Output Current IOUT(mA)
R1225N502K (VIN=15V) CDRH127-27uH
100
90
Efficiency η(%)
80
70
60
50
40
30
20
10
0
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
Ripple Voltage vs. Output Current
R1225N182A L=10uH
R1225N182B L=10uH
70
60
VIN=3.3V
50
VIN=5.0V
Ripple Voltage Vrpp(mV)
70
Ripple Voltage Vrpp(mV)
2)
40
30
20
10
0
0.1
1
10
100
1000
Output Current IOUT(mA)
10000
60
VIN=3.3V
50
VIN=5.0V
40
30
20
10
0
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
21
R1225N
R1225N182C L=10uH
R1225N182D L=10uH
70
60
VIN= 3.3V
50
VIN= 5.0V
40
VIN=12.0V
Ripple Voltage Vrpp(mV)
Ripple Voltage Vrpp(mV)
70
30
20
10
0
0.1
1
10
100
1000
60
VIN= 3.3V
50
VIN= 5.0V
40
VIN=12.0V
30
20
10
0
0.1
10000
Output Current IOUT(mA)
R1225N182J L=27uH
50
VIN=5.0V
Ripple Voltage Vrpp(mV)
Ripple Voltage Vrpp(mV)
VIN=3.3V
40
30
20
10
1
10
100
1000
60
VIN= 3.3V
50
VIN= 5.0V
40
VIN=12.0V
10000
20
10
0
0.1
10000
1
10
100
1000
10000
Output Current IOUT(mA)
R1225N332A L=10uH
R1225N332B L=10uH
70
60
VIN=4.8V
50
VIN=7.0V
Ripple Voltage Vrpp(mV)
70
Ripple Voltage Vrpp(mV)
1000
30
Output Current IOUT(mA)
40
30
20
10
1
10
100
1000
Output Current IOUT(mA)
22
100
70
60
0
0.1
10
R1225N182K L=27uH
70
0
0.1
1
Output Current IOUT(mA)
10000
60
VIN=4.8V
50
VIN=7.0V
40
30
20
10
0
0.1
1
10
100
1000
Output Current IOUT(mA)
10000
R1225N
R1225N332C L=10uH
R1225N332D L=10uH
70
60
VIN= 4.8V
50
VIN=12.0V
40
VIN=15.0V
Ripple Voltage Vrpp(mV)
Ripple Voltage Vrpp(mV)
70
30
20
10
0
0.1
1
10
100
1000
60
VIN= 4.8V
50
VIN=12.0V
40
VIN=15.0V
30
20
10
0
0.1
10000
Output Current IOUT(mA)
R1225N332J L=27uH
50
VIN=7.0V
Ripple Voltage Vrpp(mV)
Ripple Voltage Vrpp(mV)
VIN=4.8V
40
30
20
10
1
10
100
1000
60
VIN= 4.8V
50
VIN=12.0V
40
VIN=15.0V
1000
10000
30
20
10
0
0.1
10000
Output Current IOUT(mA)
1
10
100
1000
10000
Output Current IOUT(mA)
R1225N502A L=10uH
R1225N502B L=10uH
70
60
VIN= 6.5V
50
VIN=10.0V
Ripple Voltage Vrpp(mV)
70
Ripple Voltage Vrpp(mV)
100
70
60
40
30
20
10
0
0.1
10
R1225N332K L=27uH
70
0
0.1
1
Output Current IOUT(mA)
1
10
100
1000
Output Current IOUT(mA)
10000
60
VIN= 6.5V
50
VIN=10.0V
40
30
20
10
0
0.1
1
10
100
1000
10000
Output Current IOUT(mA)
23
R1225N
R1225N502C L=10uH
R1225N502D L=10uH
70
60
VIN= 6.5V
50
VIN=12.0V
40
VIN=15.0V
Ripple Voltage Vrpp(mV)
Ripple Voltage Vrpp(mV)
70
30
20
10
0
0.1
1
10
100
1000
60
VIN= 6.5V
50
VIN=12.0V
40
VIN=15.0V
30
20
10
0
0.1
10000
Output Current IOUT(mA)
R1225N502J L=27uH
60
VIN= 6.5V
50
VIN=10.0V
Ripple Voltage Vrpp(mV)
Ripple Voltage Vrpp(mV)
100
1000
10000
L=27uH
70
40
30
20
10
0
0.1
1
10
100
1000
60
VIN= 6.5V
50
VIN=12.0V
40
VIN=15.0V
30
20
10
0
0.1
10000
Output Current IOUT(mA)
1
10
100
1000
10000
Output Current IOUT(mA)
Input Voltage vs. Output Voltage
R1225N182B L=10uH
2.00
2.00
1.95
1.95
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N182A L=10uH
1.90
1.85
1.80
1.75
1mA
1.70
500mA
1.65
1.60
1.90
1.85
1.80
1.75
1mA
1.70
500mA
1.65
1.60
0
5
10
15
Input Voltage VIN(V)
24
10
R1225N502K
70
3)
1
Output Current IOUT(mA)
20
0
5
10
15
Input Voltage VIN(V)
20
R1225N
R1225N182D L=10uH
2.00
1.95
1.95
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N182C L=10uH
2.00
1.90
1.85
1.80
1.75
1mA
1.70
500mA
1.65
1.60
1.90
1.85
1.80
1.75
1mA
1.70
500mA
1.65
1.60
0
5
10
15
20
0
Input Voltage VIN(V)
1.95
1.95
1.90
1.85
1.80
1.75
1mA
500mA
1.60
20
1.90
1.85
1.80
1.75
1mA
1.70
500mA
1.65
1.60
0
5
10
15
20
0
Input Voltage VIN(V)
3.38
3.38
Output Voltage VOUT(V)
3.40
3.36
3.34
3.32
3.30
1mA
3.24
500mA
10
15
20
R1225N332B L=10uH
3.40
3.28
3.26
5
Input Voltage VIN(V)
R1225N332A L=10uH
Output Voltage VOUT(V)
15
R1225N182K L=27uH
2.00
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N182J L=27uH
1.65
10
Input Voltage VIN(V)
2.00
1.70
5
3.22
3.20
3.36
3.34
3.32
3.30
3.28
3.26
1mA
3.24
500mA
3.22
3.20
0
5
10
15
Input Voltage VIN(V)
20
0
5
10
15
20
Input Voltage VIN(V)
25
R1225N
R1225N332D L=10uH
3.40
3.38
3.38
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N332C L=10uH
3.40
3.36
3.34
3.32
3.30
3.28
3.26
1mA
3.24
500mA
3.22
3.20
3.36
3.34
3.32
3.30
3.28
3.26
1mA
3.24
500mA
3.22
3.20
0
5
10
15
20
0
5
Input Voltage VIN(V)
3.38
3.38
3.36
3.34
3.32
3.30
1mA
3.24
500mA
3.22
3.20
3.36
3.34
3.32
3.30
3.28
3.26
1mA
3.24
500mA
5
10
15
20
0
5
Input Voltage VIN(V)
10
15
20
Input Voltage VIN(V)
Output Voltage vs. Output Current
R1225N182A L=10uH
R1225N182B L=10uH
1.850
Output Voltage VOUT(V)
Output Voltage VOUT(V)
1.850
1.830
1.810
1.790
VIN=3.3V
1.770
VIN=5.0V
1.750
0.1
1
10
100
1000
Output Current IOUT(mA)
26
20
3.22
3.20
0
4)
15
R1225N332K L=27uH
3.40
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N332J L=27uH
3.40
3.28
3.26
10
Input Voltage VIN(V)
10000
1.830
1.810
1.790
VIN=3.3V
1.770
VIN=5.0V
1.750
0.1
1
10
100
1000
Output Current IOUT(mA)
10000
R1225N
R1225N182C L=10uH
R1225N182D L=10uH
1.850
Output Voltage VOUT(V)
Output Voltage VOUT(V)
1.850
1.830
1.810
1.790
VIN= 3.3V
VIN= 5.0V
1.770
VIN=12.0V
1.750
0.1
1
10
100
1000
1.830
1.810
1.790
VIN= 3.3V
VIN=12.0V
1.750
0.1
10000
Output Current IOUT(mA)
R1225N182J L=27uH
Output Voltage VOUT(V)
Output Voltage VOUT(V)
100
1000
10000
R1225N182K L=27uH
1.810
1.790
VIN=3.3V
1.770
VIN=5.0V
1
10
100
1000
1.830
1.810
1.790
VIN= 3.3V
VIN=12.0V
1.750
0.1
10000
R1225N332A L=10uH
3.380
Output Voltage VOUT(V)
3.38
3.36
3.34
3.32
3.30
VIN=4.8V
VIN=7.0V
1
10
100
1000
Output Current IOUT(mA)
10
100
1000
10000
R1225N332B L=10uH
3.400
3.24
1
Output Current IOUT(mA)
3.40
3.28
3.26
VIN= 5.0V
1.770
Output Current IOUT(mA)
Output Voltage VOUT(V)
10
1.850
1.830
3.22
3.20
0.1
1
Output Current IOUT(mA)
1.850
1.750
0.1
VIN= 5.0V
1.770
10000
3.360
3.340
3.320
3.300
3.280
3.260
VIN=4.8V
3.240
3.220
3.200
0.1
VIN=7.0V
1
10
100
1000
10000
Output Current IOUT(mA)
27
R1225N
R1225N332D L=10uH
3.400
3.380
3.380
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N332C L=10uH
3.400
3.360
3.340
3.320
3.300
3.280
3.260
VIN= 4.8V
3.240
VIN=12.0V
3.220
3.200
0.1
VIN=15.0V
1
10
100
1000
10000
3.360
3.340
3.320
3.300
3.280
3.260
3.240
VIN=12.0V
3.220
3.200
0.1
VIN=15.0V
Output Current IOUT(mA)
3.380
3.380
3.360
3.340
3.320
3.300
3.220
3.200
0.1
VIN=4.8V
VIN=7.0V
1
10
100
1000
10000
10000
3.320
3.300
3.280
3.260
VIN= 4.8V
3.240
VIN=12.0V
3.220
3.200
0.1
VIN=15.0V
R1225N502A L=10uH
1
10
100
1000
10000
R1225N502B L=10uH
5.100
5.080
VIN= 6.5V
5.060
5.040
VIN=10.0V
Output Voltage VOUT(V)
Output Voltage VOUT(V)
1000
Output Current IOUT(mA)
5.100
5.020
5.000
4.980
4.960
4.940
1
10
100
1000
Output Current IOUT(mA)
28
100
3.360
3.340
Output Current IOUT(mA)
4.920
4.900
0.1
10
R1225N332K L=27uH
3.400
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N332J L=27uH
3.240
1
Output Current IOUT(mA)
3.400
3.280
3.260
VIN= 4.8V
10000
5.080
5.060
5.040
5.020
5.000
4.980
4.960
VIN= 6.5V
4.940
4.920
4.900
0.1
VIN=10.0V
1
10
100
1000
Output Current IOUT(mA)
10000
R1225N
R1225N502C L=10uH
R1225N502D L=10uH
5.100
5.080
5.060
5.040
VIN= 6.5V
5.020
VIN=15.0V
Output Voltage VOUT(V)
Output Voltage VOUT(V)
5.100
VIN=12.0V
5.000
4.980
4.960
4.940
4.920
4.900
0.1
1
10
100
1000
10000
5.080
5.060
5.040
5.020
5.000
4.980
4.960
VIN= 6.5V
4.940
VIN=12.0V
4.920
4.900
0.1
VIN=15.0V
Output Current IOUT(mA)
5.080
5.080
5.060
5.040
5.020
5.000
VIN= 6.5V
4.940
4.920
4.900
0.1
VIN=10.0V
1
10
100
1000
5.060
5.040
VIN= 6.5V
5.020
100
1000
10000
VIN=15.0V
4.980
4.960
4.940
4.920
4.900
0.1
10000
VIN=12.0V
5.000
Output Current IOUT(mA)
1
10
100
1000
10000
Output Current IOUT(mA)
Load Transient Response
R1225N332A L=10uH VIN=4.8V
3.50
2000
3.40
1800
3.45
1800
3.30
3.20
1600
1400
3.40
3.35
1600
1400
3.10
1200
3.30
1200
3.00
1000
3.25
1000
2.90
2.80
800
600
3.20
3.15
800
600
2.70
400
3.10
400
2.60
200
2.50
0
-0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004
Time(sec)
Output Voltage VOUT(V)
2000
Output Current IOUT(mA)
3.50
3.05
3.00
-0.05
0.00
0.05
0.10
200
0
0.15
Output Current IOUT(mA)
R1225N332A L=10uH VIN=4.8V
Output Voltage VOUT(V)
5)
10
R1225N502K L=27uH
5.100
Output Voltage VOUT(V)
Output Voltage VOUT(V)
R1225N502J L=27uH
5.100
4.980
4.960
1
Output Current IOUT(mA)
Time(sec)
29
R1225N
2000
3.40
1800
3.45
1800
3.30
3.20
1600
1400
3.40
3.35
1600
1400
3.10
1200
3.30
1200
3.00
1000
3.25
1000
2.90
2.80
800
600
3.20
3.15
800
600
2.70
400
3.10
400
2.60
200
2.50
0
-0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004
Output Voltage VOUT(V)
3.50
3.05
3.00
-0.05
0.00
0.05
Time(sec)
Time(sec)
3.50
2000
3.40
1800
3.45
1800
3.30
3.20
1600
1400
3.40
3.35
1600
1400
3.10
1200
3.30
1200
3.00
1000
3.25
1000
2.90
2.80
800
600
3.20
3.15
800
600
2.70
400
3.10
400
2.60
200
2.50
0
-0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004
Output Voltage VOUT(V)
2000
3.05
3.00
-0.04 -0.02
0
Time(sec)
0.04
0.06
Time(sec)
R1225N332B L=10uH VIN=7V
3.50
2000
3.40
1800
3.45
1800
3.30
3.20
1600
1400
3.40
3.35
1600
1400
3.10
1200
3.30
1200
3.00
1000
3.25
1000
2.90
2.80
800
600
3.20
3.15
800
600
2.70
400
3.10
400
2.60
200
2.50
0
-0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004
Time(sec)
Output Voltage VOUT(V)
2000
Output Current IOUT(mA)
3.50
3.05
3.00
-0.04 -0.02
0
0.02
0.04
Time(sec)
0.06
200
0
0.08
Output Current IOUT(mA)
R1225N332B L=10uH VIN=7V
Output Voltage VOUT(V)
0.02
200
0
0.08
Output Current IOUT(mA)
R1225N332B L=10uH VIN=4.8V
3.50
Output Current IOUT(mA)
Output Voltage VOUT(V)
R1225N332B L=10uH VIN=4.8V
30
0.10
200
0
0.15
Output Current IOUT(mA)
R1225N332A L=10uH VIN=7V
2000
Output Current IOUT(mA)
Output Voltage VOUT(V)
R1225N332A L=10uH VIN=7V
3.50
R1225N
2000
3.40
1800
3.45
1800
3.30
3.20
1600
1400
3.40
3.35
1600
1400
3.10
1200
3.30
1200
3.00
1000
3.25
1000
2.90
2.80
800
600
3.20
3.15
800
600
2.70
400
3.10
400
2.60
200
2.50
0
-0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004
Output Voltage VOUT(V)
3.50
3.05
3.00
-0.04 -0.02
0
Time(sec)
0.04
0.06
Time(sec)
R1225N332J L=27uH VIN=7V
3.50
2000
3.40
1800
3.45
1800
3.30
3.20
1600
1400
3.40
3.35
1600
1400
3.10
1200
3.30
1200
3.00
1000
3.25
1000
2.90
2.80
800
600
3.20
3.15
800
600
2.70
400
3.10
400
2.60
200
2.50
0
-0.0002 -0.0001 0.0000 0.0001 0.0002 0.0003 0.0004
Time(sec)
Output Voltage VOUT(V)
2000
Output Current IOUT(mA)
3.50
3.05
3.00
-0.04 -0.02
0
0.02
0.04
0.06
200
0
0.08
Output Current IOUT(mA)
R1225N332J L=10uH VIN=7V
Output Voltage VOUT(V)
0.02
200
0
0.08
Output Current IOUT(mA)
R1225N332J L=27uH VIN=4.8V
2000
Output Current IOUT(mA)
Output Voltage VOUT(V)
R1225N332J L=27uH VIN=4.8V
3.50
Time(sec)
31