S-1131 Series

www.sii-ic.com

HIGH RIPPLE-REJECTION AND LOW DROPOUT

MIDDLE OUTPUT CURRENT CMOS VOLTAGE REGULATOR

© Seiko Instruments Inc., 2002-2014

Seiko Instruments Inc.

1

The S-1131 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 capacitance of the output

transistor. An ON/OFF circuit ensures a long battery life, and small SOT-89-3, SOT-89-5 and 6-Pin HSON(A)

packages realize high-density mounting.

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: 35

μA typ., 65 μA max.

During power-off: 0.1

μA typ., 1.0 μA max.

• Output current:

*1

• Ripple rejection:

70 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

*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 DVD and CD-ROM drive

• Constant-voltage power supply for battery-powered device

• Constant-voltage power supply for personal communication device

• Constant-voltage power supply for note book PC

Packages

• SOT-89-3

• SOT-89-5

• 6-Pin HSON(A)