S-1137 Datasheet, PDF (27/47 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT SOFT-START FUNCTION CMOS VOLTAGE REGULATOR

HIGH RIPPLE-REJECTION LOW DROPOUT SOFT-START FUNCTION CMOS VOLTAGE REGULATOR
Rev.2.1_01
S-1137 Series
 Reference Data
(1) Transient Response Characteristics when Input (Ta = 25°C)
VOUT = 1.2 V
IOUT = 100 mA, tr = tf = 5.0 μs, CL = 1.0 μF, CSS = 1.0 nF
VOUT = 2.5 V
IOUT = 100 mA, tr = tf = 5.0 μs, CL = 1.0 μF, CSS = 1.0 nF
1.32
4.0
1.30
3.5
1.28
3.0
1.26 VIN
2.5
1.24
2.0
1.22
VOUT
1.5
1.20
1.0
1.18
0.5
1.16
0
−100 −50 0 50 100 150 200 250 300 350
t [μs]
VOUT = 3.5 V
IOUT = 100 mA, tr = tf = 5.0 μs, CL = 1.0 μF, CSS = 1.0 nF
2.74
2.70
2.66 _VIN
2.62
2.58
2.54
2.50
VOUT
2.46
2.42
−100 −50 0
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
50 100 150 200 250 300 350
t [μs]
3.74
3.70
3.66 _VIN
3.62
3.58
3.54
3.50
VOUT
3.46
3.42
−100 −50 0
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
50 100 150 200 250 300 350
t [μs]
(2) Transient Response Characteristics of Load (Ta = 25°C)
VOUT = 1.2 V
VOUT = 2.5 V
VIN = 2.2 V, CIN = CL = 1.0 μF, CSS = 1.0 nF, IOUT = 50 mA ↔ 100 mA VIN = 3.5 V, CIN = CL = 1.0 μF, CSS = 1.0 nF, IOUT = 50 mA ↔ 100 mA
1.40
150
1.35
IOUT
100
1.30
50
1.25
VOUT
0
1.20
−50
1.15
−100
1.10
−150
−100 −50 0 50 100 150 200 250 300 350
t [μs]
VOUT = 3.5 V
VIN = 4.5 V, CIN = CL = 1.0 μF, CSS = 1.0 nF, IOUT = 50 mA ↔ 100 mA
2.70
2.65
IOUT
2.60
2.55
2.50
VOUT
2.45
2.40
−100 −50 0
150
100
50
0
−50
−100
−150
50 100 150 200 250 300 350
t [μs]
3.70
3.65
IOUT
3.60
3.55
3.50
VOUT
3.45
3.40
−100 −50 0
150
100
50
0
−50
−100
−150
50 100 150 200 250 300 350
t [μs]
27