tr=tf=3us
IN
C = Ceramic 10uF
R1170X301B
IN
OUT
C =Ceramic 10uF
V =4V
3.5
3.4
3.3
3.2
3.1
3
120
100
80
60
40
20
0
Output Current
Output Voltage
2.9
0
20
40
60
80
100
120
140
160
180
200
Time t(us)
tr=tf=3us
IN
C = Ceramic 10uF
R1170X301B
IN
OUT
C =Ceramic 4.7uF
V =4V
3.5
3.4
3.3
3.2
3.1
3
120
100
80
60
40
20
0
Output Current
Output Voltage
2.9
0
20
40
60
80
100
120
140
160
180
200
Time t(us)
12)Stable Area(Topt=25°C,VIN=Set Output Voltage+1V,CIN=Ceramic 10µF)
CE
Vout
Ceramic
Spectrum
Analyzer
R1170XXXXB
Capacitor
S.A.
VIN
GND
ESR
Ceramic
Vin
IIout
Capacitor
As an output capacitor for this IC, Ceramic capacitor is recommendable. However, other low ESR type capacitor can
be used with this IC.
For your reference, noise level is tested with the circuit as shown above, and if the noise level is 40µV or less than
40µV, the ESR values are plotted as stable area. Upper limit is described in the next four graphs, or ESR vs. Output
Current. (Hatched area is the stable area.)
Rev. 1.10
-15-
RICOH [ RICOH ELECTRONICS DEVICES DIVISION ]
