S-1137 Datasheet, PDF (28/47 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
S-1137 Series
Rev.2.1_01
(3) Transient Response Characteristics of ON / OFF Pin (Ta = 25°C)
VOUT = 1.2 V
VIN = 2.2 V, tr = 1.0 μs, CIN = CL = 1.0 μF, CSS = 1.0 nF, IOUT = 100 mA
VOUT = 2.5 V
VIN = 3.5 V, tr = 1.0 μs, CIN = CL = 1.0 μF, CSS = 1.0 nF, IOUT = 100 mA
2.4
3
2.0
2
VON / OFF
1.6
1
1.2
0
0.8
VOUT
−1
0.4
−2
0
−0.5 0
−3
0.5 1.0 1.5 2.0
t [ms]
VOUT = 3.5 V
VIN = 4.5 V, tr = 1.0 μs, CIN = CL = 1.0 μF, CSS = 1.0 nF, IOUT = 100 mA
6
5
4
3
2
1
0
−0.5 0
0.5 1.0
t [ms]
6
4
VON / OFF
2
0
VOUT
−2
−4
−6
1.5 2.0
6
5
4
3
2
1
0
−0.5 0
0.5 1.0
t [ms]
6
VON / OFF
4
2
VOUT
0
−2
−4
−6
1.5 2.0
(4) Soft-start Time vs. Ambient Temperature Characteristics
VIN = VOUT + 1.0 V, VON / OFF = 0 V → VOUT + 1.0 V,
CIN = CL = 1.0 μF, CSS = 1.0 nF
1.4
1.2
1.0
0.8
0.6
0.4 ^{VOUT = 1.2 V}
2.5 V
0.2
3.5 V
0
40 25 0
25 50
Ta [C]
75 85
(5) Soft-start time vs. Capacitor for Soft-start Characteristics
(Ta = 25°C)
VIN = VOUT + 1.0 V, VON / OFF = 0 V → VOUT + 1.0 V,
CIN = CL = 1.0 μF
100.0
10.0
1.0
VOUT = 1.2 V
2.5 V
3.5 V
0.1
0.1
1.0
10.0
CSS [nF]
100.0
28