R1234D Datasheet, PDF (21/26 Pages) RICOH electronics devices division – PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier

R1234D
6) Output Ripple Voltage vs. Output Current
R1234D181B
COUT=10µF, Tantalum, ESR=400mΩ
80
70
60
VIN=5.0V
50
40
30
VIN=3.3V
20
10
0
50 100 150 200 250 300 350 400 450 500
Output Current IOUT(mA)
8) Output Voltage vs. Input Voltage
R1234D181B
2.00
1.95
1.90
1.85
1.80
1.75
1.70
1.65
IOUT=20mA
1.60
2
3
4
5
6
Input Voltage VIN(V)
10) Supply Current vs. Temperature
VIN =5.5V
450
400
800kHz
350
500kHz
300
250
200
150
100
-40 -25 0
25 50
Temperature Topt(°C)
75 85
7) Output Voltage vs. Temperature
R1234D181B
1.90
IOUT=100mA
1.85
1.80
1.75
1.70
-40 -25
0
25 50
Temperature Topt(°C)
75 85
9) Frequency vs. Temperature
1000
VIN =VOUT+1.5V
900
800
700
800kHz
500kHz
600
500
400
300
-40 -25 0
25 50
Temperature Topt(°C)
75 85
11) Soft-start Time vs. Temperature
R1234D181B
VIN =3.3V
3.0
2.5
800kHz
2.0
500kHz
1.5
1.0
0.5
0
-40 -25
0
25 50
Temperature Topt(°C)
75 85
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