S-13A1 Datasheet, PDF (44/74 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-13A1 Series
Rev.2.1_00
5. Output capacitance vs. Characteristics of discharge time (Ta = +25°C)
V_IN = V_OUT + 1.0 V, I_OUT = no load
V_{ON / OFF} = V_OUT + 1.0 V → V_SS, t_f = 1 μs
2.5
2.0
VOUT(S) = 1.0 V
1.5
2.5 V
3.5 V
1.0
0.5
0
0 2 4 6 8 10 12
CL [μF]
Figure 35 S-13A1 Series A / B type
(with discharge shunt function)
VON / OFF
1 μs
V_OUT
tDSC
V_SS
V_OUT × 10%
V_IN = V_OUT + 1.0 V
VON / OFF = VOUT + 1.0 V → VSS
Figure 36 Measurement Condition of Discharge Time
6. Example of equivalent series resistance vs. Output current characteristics (Ta = +25°C)
100
0 _0.1
C_IN = C_L = 2.2 μF
Stable
VIN
VOUT
C_IN
S-13A1 Series _SSC
ON / OFF
VSS
C_SS^*2
C_L^*1
R_ESR
I_OUT [mA]
1000
*1. C_L: TDK Corporation C3225X8R1E225K (2.2 μF)
*2. C_SS: Murata Manufacturing Co., Ltd. GRM1882C1H102JA01 (1.0 nF)
Figure 37
Figure 38
44