R1230D Datasheet, PDF (13/20 Pages) RICOH electronics devices division – PWM/VFM Step-down DC/DC Converter with Synchronous Rectifier

100
90
80
70
60
50
40
30
20
10
0
1
10
100
Output Current IOUT[mA]
R1230D251B
Vin=3.3V PWM
Vin=3.3V VFM
Vin=5.0V PWM
Vin=5.0V VFM
1000
3) Ripple Voltage vs. Output Current
0.06
COUT=10uF Tantalum Capacitor ESR=400mohm
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-1.00E-06 0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06
5.00E-06
6.00E-06
R1230D181A
7.00E-06 8.00E-06
PWM Mode
Time [sec]
VIN=5.0V IOUT=200mA
80
70
60
VIN=5.0V
50
VIN=3.3V
40
30
20
10
0
0
50
100
150
200
250
300
350
400
450
500
R1230D181B
COUT=10µF Tantalum Capacitor ESR=400mΩ ^{Output Current IOUT[mA]}
0.04
COUT=10uF Ceramic Capacitor ESR=220mohm
0.03
0.02
0.01
0
-0.01
-0.02
-0.03
-0.04
-1.00E-06 0.00E+00 1.00E-06 2.00E-06 3.00E-06 4.00E-06
PWM Mode
Time [sec]
5.00E-06
R1230D181B
6.00E-06 7.00E-06 8.00E-06
VIN=5.0V IOUT=200mA
Rev. 1.12
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