HIGH RIPPLE-REJECTION AND LOW DROPOUT CMOS VOLTAGE REGULATOR
Rev.6.0_00
S-1112/1122 Series
Seiko Instruments Inc.
21
Reference Data
(1) Input transient response characteristics
S-1112B15 (Ta = 25°C) S-1112B30 (Ta = 25°C)
IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF
VOUT [V]
1.62
1.60
1.58
1.56
1.54
1.52
1.50
1.48
1.46
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
IN
V
OUT
-40
-20
0
20
40
60 80
100
120
140
160
VIN [V]
VOUT [V]
-40 -20 0 20 40 60
80
100
120
140
160
V
IN
V
OUT
3.08
3.06
3.04
3.02
3.00
2.98
2.96
6
5
4
3
2
1
0
VIN [V]
t [μs]
t [μs]
S-1112B50 (Ta = 25°C)
IOUT = 30 mA, tr = tf = 5.0 μs, COUT = 0.47 μF, CIN = 0 μF
VOUT [V]
5.12
5.10
5.08
5.06
5.04
5.02
5.00
4.98
4.96
8
7
6
5
4
3
2
1
0
V
IN
V
OUT
-40
-20
0
20
40
60 80
100
120
140
160
VIN [V]
t [μs]
(2) Load transient response characteristics
S-1112B15 (Ta = 25°C) S-1112B30 (Ta = 25°C)
VIN = 2.5 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 50↔100 mA VIN = 4.0 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 50↔100 mA
VOUT [V]
0
20
40
60 80
100
120
140
-40
-20
160
I
OUT
V
OUT
1.70
1.65
1.60
1.55
1.50
1.45
1.40
150
100
50
0
–50
–100
–150
IOUT [mA]
VOUT [V]
0 20 40 60
80
100
120
140
-40 -20 160
I
OUT
V
OUT
150
100
50
0
–50
–100
–150
3.20
3.15
3.10
3.05
3.00
2.95
2.90
IOUT [mA]
t [μs]
t [μs]
S-1112B50 (Ta = 25°C)
VIN = 6.0 V, COUT = 0.47 μF, CIN = 1.0 μF, IOUT = 50↔100 mA
VOUT [V]
0
20
40
60 80
100
120
140
-40
-20
160
V
OUT
I
OUT
5.20
5.15
5.10
5.05
5.00
4.95
4.90
150
100
50
0
–50
–100
–150
IOUT [mA]
t [μs]
