S-1137 Datasheet, PDF (30/47 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
(7) Output Capacitance vs. Characteristics of Discharge Time (Ta = 25°C)
S-1137 Series A / B type (with discharge shunt function)
VIN = VOUT + 1.0 V, IOUT = no load
VON / OFF = VOUT + 1.0 V → VSS, tf = 1 μs
2.5
2.0
VOUT(s) = 1.2 V
1.5
2.5 V
3.5 V
1.0
VON / OFF
0.5
0
0
2 4 6 8 10 12
CL [μF]
V_OUT
1 μs
tDSC
V_SS
V_OUT × 10%
V_IN = V_OUT + 1.0 V
VON / OFF = VOUT + 1.0 V → VSS
Figure 22 Measurement Condition of Discharge Time
(8) Example of Equivalent Series Resistance vs. Output Current Characteristics (Ta = 25°C)
CL : Murata Manufacturing Co., Ltd. GRM155B31A105K (1.0 μF)
CSS : Murata Manufacturing Co., Ltd. GRM40B102K (1.0 nF)
100
0 _0.1
C_IN = C_L = 1.0 μF
C_SS = 1.0 nF
Stable
300
I_OUT [mA]
VIN
VOUT
CIN
S-1137 Series _SSC
ON / OFF
VSS
CSS
CL
RESR
30