S-1112/1122 Series

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HIGH RIPPLE-REJECTION AND LOW DROPOUT

CMOS VOLTAGE REGULATOR

© Seiko Instruments Inc., 2002-2015

Seiko Instruments Inc.

1

The S-1112/1122 Series is a positive voltage regulator with a low dropout voltage, high-accuracy output

voltage, and low current consumption developed based on CMOS technology.

A built-in low on-resistance transistor provides a low dropout voltage and large output current, and a built-in

overcurrent protection circuit prevents the load current from exceeding the current

capacity of the output

transistor. An ON/OFF circuit ensures a long battery life. Compared with the voltage regulators using the

conventional CMOS technology, a larger variety of capacitors are available, including small ceramic capacitors.

Small SNT-6A(H) (S-1112 Series only) and SOT-23-5 packages realize high-density mounting. In SOT-23-5,

the lineup includes the S-1112 and S-1122 Series, which differ in pin configuration.



Features

• Output voltage:

1.5 V to 5.5 V, selectable in 0.1 V step

• Output voltage accuracy:

±1.0%

• Dropout voltage:

• Current consumption:

During operation: 50

μA typ., 90 μA max.

During power-off: 0.1

μA typ., 1.0 μA max.

• Output current:

*1

• Output capacitor:

A ceramic capacitor of 0.47

μF or more can be used.

• Ripple rejection:

80 dB typ. (f = 1.0 kHz)

• Built-in overcurrent protection circuit:

Limits overcurrent of output transistor.

• Built-in ON/OFF circuit:

Ensures long battery life.

• Operation temperature range:

Ta =

−40°C to +85°C

• Lead-free, Sn 100%, halogen-free

*2

*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 personal communication device

• Constant-voltage power supply for home electric/electronic appliance

• Constant-voltage power supply for cellular phone



Packages

• SNT-6A(H)

• SOT-23-5