HIGH RIPPLE-REJECTION AND LOW DROPOUT HIGH OUTPUT CURRENT

CMOS VOLTAGE REGULATOR

S-1170 Series

Seiko Instruments Inc.

1

The S-1170 Series is a positive voltage regulator with

a low dropout voltage, high output voltage accuracy,

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, a built-in

overcurrent protector prevents the load current from

exceeding the current capacitance of the output

transistor, and a built-in thermal shutdown circuit

prevents damage caused by the heat. An ON/OFF

circuit ensures a long battery life. Compared with the

voltage regulators using the conventional CMOS

process, a larger variety of capacitors are available,

including small ceramic capacitors. Small 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 steps.

• High-accuracy output voltage:

±1.0%

• Low dropout voltage:

= 300 mA)

• Low current consumption:

During operation: 80

µA typ., 160 µA max.

During shutdown: 0.1

µA typ., 1.0 µA max.

• High current capability:

*1

• Built-in ON/OFF circuit:

Ensures long battery life.

• Low ESR capacitor can be used: A ceramic capacitor of 4.7 µF or more can be used for the output

capacitor.

• High ripple rejection:

70 dB typ. (at 1.0 kHz)

• Built-in overcurrent protector:

Overcurrent of output transistor can be restricted.

• Built-in thermal shutdown circuit: Damage caused by heat can be prevented.

• Small package:

SOT-89-5, 6-Pin HSON(A)

• Lead-free products

*1. Attention should be paid to the power dissipation of the package when the output current is large.

Applications

• Power supply for DVD and CD-ROM drives

• Power supply for battery-powered devices

• Power supply for personal communication device

• Power supply for note PCs

Packages

Package Name

Drawing Code

Package

Tape

Reel

SOT-89-5

UP005-A

UP005-A

UP005-A

6-Pin HSON(A)

PD006-A

PD006-A

PD006-A