HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT

CMOS VOLTAGE REGULATOR

S-1172 Series

Seiko Instruments Inc.

1

The S-1172 Series, developed based on CMOS technology, is a positive

voltage regulator with a super low dropout voltage, high output voltage

accuracy, and low current consumption.

The S-1172 Series provides the very small dropout voltage and the large

output current due to the built-in transistor with low on-resistance. The

overcurrent protector prevents the load current from exceeding the

capacitance of output transistor. The thermal shutdown circuit prevents

damage caused by heat, the rush current control circuit limits the

excessive rush current during start-up.

The ON/OFF circuit ensures longer battery life. Various capacitors, also

small ceramic capacitors, can be used for this IC more than for the

conventional regulator ICs which have CMOS technology.

The packages, high heat radiation HSOP-6 and small SOT-89-5 enable

high-density mounting.

Features

• Output voltage :

1.0 to 5.0 V, selectable in 0.05 V step.

• Low equivalent series resistance capacitor :

Ceramic capacitor of 4.7

µF or more can be used as the

I/O capacitor.

• Input voltage :

1.5 to 5.5 V

• High-accuracy output voltage :

±1.0% (1.0 to 1.45 V output product : ±15 mV)

• Low dropout voltage :

• Low current consumption :

During operation : 70

µA typ., 90 µA max.

(3.0 V output product)

During shutdown : 0.1

µA typ., 1.0 µA max.

• Output current :

*1

• High ripple rejection :

• Built-in overcurrent protection circuit :

limits overcurrent of output transistor

• Built-in thermal shutdown circuit :

prevents damage caused by heat

• Built-in rush current control circuit :

limits excessive rush current during start-up

• Built-in power on/off circuit :

Longer battery life

• Small package :

SOT-89-5, HSOP-6

• Lead-free product

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

Applications

• Power supply for battery-powered devices

• Power supply for TV, notebook PCs and home electric appliances

• Constant-voltage power supply for portable equipment

Packages

Drawing Code

Package Name

Package

Tape

Reel

Land

SOT-89-5

UP005-A

UP005-A

UP005-A



HSOP-6

FH006-A

FH006-A

FH006-A

FH006-A