S-1172 Datasheet, PDF (24/34 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR
S-1172 Series
Rev.1.1_00
(4) Characteristics of Rush Current (Ta = 25°C)
S-1172B10
V_IN = 2.0 V, C_OUT = 4.7 µF, C_IN = 4.7 µF, I_OUT = 100 mA
6
1.2
4
1.0
VON/OFF
2
0.8
0
VOUT
0.6
−2
0.4
IOUT
−4
0.2
−6
0
−50
0
50 100 150 200
t [µs]
S-1172B30
V_IN = 4.0 V, C_OUT = 4.7 µF, C_IN = 4.7 µF, I_OUT = 100 mA
6
1.2
VON/OFF
4
1.0
2
0.8
VOUT
0
0.6
−2
0.4
IOUT
−4
0.2
−6
0
−50
0
50 100 150 200
t [µs]
S-1172B50
V_IN = 5.5 V, C_OUT = 4.7 µF, C_IN = 4.7 µF, I_OUT = 100 mA
6
1.2
4
VON/OFF
1.0
2
0.8
VOUT
0
0.6
−2
0.4
IOUT
−4
0.2
−6
0
−50
0
50 100 150 200
t [µs]
V_IN = 2.0 V, C_OUT = 4.7 µF, C_IN = 4.7 µF, I_OUT = 1000 mA
6
3.0
4
2.5
VON/OFF
2
2.0
0
VOUT
1.5
−2
1.0
IOUT
−4
0.5
−6
−500
0
0 500 1000 1500 2000
t [µs]
V_IN = 4.0 V, C_OUT = 4.7 µF, C_IN = 4.7 µF, I_OUT = 1000 mA
6
3.0
VON/OFF
4
2.5
2
2.0
VOUT
0
1.5
−2
1.0
IOUT
−4
0.5
−6
−500
0
0 500 1000 1500 2000
t [µs]
V_IN = 5.5 V, C_OUT = 4.7 µF, C_IN = 4.7 µF, I_OUT = 1000 mA
6
3.0
4 ^VON/OFF
2.5
2
VOUT
2.0
0
1.5
−2
1.0
IOUT
−4
0.5
−6
−500
0
0 500 1000 1500 2000
t [µs]
(5) Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = 25°C)
100
0.1
0
0.1
CIN = CL = 4.7 µF
Stable
IOUT [mA]
1000
VIN
C_IN
S-1172 Series
ON/OFF
VSS
VOUT
C_L
R_ESR
24
Seiko Instruments Inc.