LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series
Rev.1.2
(4) Load fluctuation
IOUT=10 A 30mA V =4V
µ →
IOUT=30mA 10 A V =4V
→
µ
IN
IN
30mA
30mA
10 A
µ
10 A
µ
IOUT
CL=2 F
IOUT
VOUT
µ
CL=2 F
µ
CL=4.7 F
µ
3V
3V
CL=4.7 F
µ
VOUT
TIME(50 sec/div)
µ
TIME(20msec/div)
Load current dependence of load fluctuation overshoot
∆IOUT shows larger load current at load current
fluctuation while smaller current is fixed to 10 µA.
For example ∆IOUT=1.E-02 (A) means load current
fluctuation from 10 mA to 10 µA.
Output capacitor (CL) dependence of overshoot
VIN=VOUT(S)+1V ,IOUT=30mA 10 A
VIN=VOUT(S)+1V,CL=2 F
µ
→
µ
1.0
0.8
0.6
0.4
0.2
0.0
0.2
5V
VOUT=2V
0.15
0.1
0.05
0
3V
3V
5V
VOUT=2V
1.E-03
1.E-02
1.E-01
1.E+00
1
10
CL(uF)
100
I
OUT(A)
∆
VDD dependence of overshoot
Temperature dependence of overshoot
VIN=VOUT(S)+1V ,IOUT=30mA 10 A CL=2 F
→
µ ,
µ
VIN=VDD, IOUT=30mA 10 A ,CL=2 F
→
µ
µ
0.3
0.2
0.1
0
0.3
0.25
0.2
3V
3V
0.15
0.1
VOUT=2V
VOUT=2V
5V
0.05
0
5V
8
0
2
4
6
10
-50
0
50
100
VDD(V)
Ta(°C)
18
Seiko Instruments Inc.
SII [ SEIKO INSTRUMENTS INC ]
