S-818_1 Datasheet, PDF (24/32 Pages) Seiko Instruments Inc – LOW DROPOUT CMOS VOLTAGE REGULATOR

LOW DROPOUT CMOS VOLTAGE REGULATOR
S-818 Series
Rev.2.1_00
4. Load fluctuation
30mA
I_OUT=10_µA_→30mA V_IN=4V
30mA
I_OUT=30mA_→10_µA V_IN=4V
10µA
3V
I_OUT
V_OUT
CL=2_µF
10µA
I_OUT
3V
CL=2_µF
CL=4.7_µF
CL=4.7_µF
V_OUT
TIME(50_µsec/div)
TIME(20msec/div)
Load current dependence of load fluctuation overshoot
VIN=VOUT(S)+1 V, CL=2 µF
1.0
0.8
5V
0.6
3V
C_L dependence of overshoot
VIN=VOUT(S),+1 V, IOUT=30 mA→10 µA
0.2
0.15
VOUT=2 V
3V
0.4
0.1
0.2
VOUT=2 V
5V
0.05
0.0
1.E−03
1.E−02
1.E−01
∆IOUT [A]
1.E+00
0
1
10
100
CL [µF]
Remark ∆I_OUT shows larger load current at load current
fluctuation while smaller current is fixed to
10 µA. For example ∆I_OUT=1.E−02 (A) means
load current fluctuation from 10 mA to 10 µA.
V_DD dependencies of overshoot
V_IN=V_DD, I_OUT=30 mA→10 µA, C_L=2 µF
0.3
3V
0.2
0.1
0
0
V_OUT=2 V
5V
2
4
6
8
10
V_DD [V]
Temperature dependence of overshoot
V_IN=V_OUT(S)+1 V, I_OUT=30 mA→10 µA, C_L=2 µF
0.3
0.25
0.2
3V
0.15
0.1
0.05
V_OUT=2 V
5V
0
−50
0
50
100
Ta [°C]
24
Seiko Instruments Inc.