S-1137 Datasheet, PDF (1/47 Pages) Seiko Instruments Inc – HIGH RIPPLE-REJECTION LOW DROPOUT SOFT-START FUNCTION CMOS VOLTAGE REGULATOR

S-1137 Series
HIGH RIPPLE-REJECTION LOW DROPOUT
www.sii-ic.com
SOFT-START FUNCTION CMOS VOLTAGE REGULATOR
© SII Semiconductor Corporation, 2009-2015
Rev.2.1_01
The S-1137 Series, developed using the CMOS technology, is a positive voltage regulator IC which has the low dropout
voltage, the high-accuracy output voltage and the soft-start function (300 mA output current).
A 1.0 μF small ceramic capacitor can be used. It operates with low current consumption of 45 μA typ.
The overcurrent protection circuit prevents the load current from exceeding the current capacity of the output transistor.
The ON / OFF circuit ensures longer battery life.
Compared to the conventional CMOS technology regulator ICs, various capacitors including small ceramic capacitors can be
used for this IC.
Furthermore, small SOT-89-5, SOT-23-5, and SNT-6A(H) packages realize high-density mounting.
 Features
• Output voltage:
• Input voltage:
• Output voltage accuracy:
• Dropout voltage:
• Current consumption:
• Output current:
• Input and output capacitors:
• Ripple rejection:
• Built-in soft-start circuit:
• Built-in overcurrent protection circuit:
• Built-in ON / OFF circuit:
• Pull-down resistor is selectable.
• Discharge shunt function is selectable.
• Operation temperature range:
• Lead-free, Sn 100%, halogen-free^*2
1.2 V to 3.5 V, selectable in 0.05 V step
1.7 V to 5.5 V
±1.0% (1.2 V to 1.45 V output product : ±15 mV)
210 mV typ. (2.8 V output product, IOUT = 300 mA)
During operation: 45 μA typ., 65 μA max.
During power-off: 0.1 μA typ., 1.0 μA max.
Possible to output 300 mA (VIN ≥ VOUT(S) + 1.0 V)^*1
A ceramic capacitor of 1.0 μF or more can be used.
70 dB typ. (f = 1.0 kHz)
Soft-start time : 0.7 ms typ. (CSS = 1.0 nF)
Limits overcurrent of output transistor.
Ensures long battery life.
Ta = −40°C to +85°C
*1. Attention should be paid to the power dissipation of the package when the output current is large.
*2. Refer to “ Product Name Structure” for details.
 Applications
• Constant-voltage power supply for battery-powered device
• Constant-voltage power supply for cellular phone, portable device
• Constant-voltage power supply for digital still camera, TV, DVD recorder
 Packages
• SOT-89-5
• SOT-23-5
• SNT-6A(H)
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