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S-1172B37-U5T1G

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT CMOS VOLTAGE REGULATOR

Seiko Instruments Inc 

Rev.1.1_00

HIGH RIPPLE-REJECTION LOW DROPOUT HIGH OUTPUT CURRENT

CMOS VOLTAGE REGULATOR

S-1172 Series

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 :

• Low equivalent series resistance capacitor :

• Input voltage :

• High-accuracy output voltage :

• Low dropout voltage :

• Low current consumption :

• Output current :

• High ripple rejection :

• Built-in overcurrent protection circuit :

• Built-in thermal shutdown circuit :

• Built-in rush current control circuit :

• Built-in power on/off circuit :

• Small package :

• Lead-free product

1.0 to 5.0 V, selectable in 0.05 V step.

Ceramic capacitor of 4.7 µF or more can be used as the

I/O capacitor.

1.5 to 5.5 V

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

70 mV typ. (3.0 V output product, at IOUT = 300 mA)

During operation : 70 µA typ., 90 µA max.

(3.0 V output product)

During shutdown : 0.1 µA typ., 1.0 µA max.

1000 mA (3.0 V output product, at VIN ≥ VOUT(S) + 1.0 V)*1

70 dB typ. (at 1.0 kHz, VOUT = 1.0 V)

limits overcurrent of output transistor

prevents damage caused by heat

limits excessive rush current during start-up

Longer battery life

SOT-89-5, HSOP-6

*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

Package Name

SOT-89-5

HSOP-6

Package

UP005-A

FH006-A

Drawing Code

Tape

Reel

UP005-A

UP005-A

FH006-A

FH006-A

Land



FH006-A

Seiko Instruments Inc.

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