R1232D Datasheet, PDF (17/24 Pages) RICOH electronics devices division – PWM STEP-DOWN DC/DC CONVERTER WITH SYNCHRONOUS RECTIFIER

R1232D
1.10
IOUT=600mA
2.4
IOUT=600mA
1.05
2.3
1.00
2.2
0.95
2.1
0.90
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
2.0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
7) Lx Transistor On Resistance vs. Input Voltage
Switching Tr. Pch on Resistance
0.14
IOUT=200mA
Synchronous Rectifier Tr. Nch on Resistance
0.14
IOUT=200mA
0.13
0.13
0.12
0.12
0.11
0.11
0.10
0.10
0.09
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
0.09
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
Input Voltage VIN(V)
8) Turn-on speed by CE pin
R1232D121A
VIN=5.0V, L=4.7µH Rload=0Ω
R1232D121A
VIN=5.0V, L=4.7µH Rload=12Ω
CE
5V/div
VOUT
1V/div
IL
200mA/div
200µs/div
CE
5V/div
VOUT
1V/div
IL
200mA/div
200µs/div
R1232D331B
R1232D331B
17