UNISONIC TECHNOLOGIES CO., LTD

L1138B

CMOS IC

www.unisonic.com.tw

1 of 7

Copyright © 2017 Unisonic Technologies Co., Ltd

QW-R502-323.K

HIGH OUTPUT CURRENT CMOS

VOLTAGE REGULATOR WITH

HIGH RIPPLE-REJECTION AND

LOW DROPOUT



DESCRIPTION

The UTC L1138B is a positive LDO voltage regulator using CMOS

technology. It is featured as: low dropout voltage, high output voltage

accuracy, and low current consumption.

The internal circuits include a low on-resistance transistor to provide

a low dropout voltage and large output current; an overcurrent protector

to make sure the load current don’t exceed the current capacitance of

the output transistor, a thermal shutdown circuit to escape device

damage from over-heat, and an ON/OFF circuit to keep the battery life

longer.

In applications, the UTC L1138B can be used in power supply unit

for DVD, CD-ROM drives, battery-powered devices, personal

communication devices, and NBs.

SOP-8

1

SOT-89-5

SOT-25

1

3

5

2

4



FEATURES

* Output voltage‘s high accuracy: ±1.0%

* Low dropout voltage:

120mV typ.

* Low current consumption:

80μA(Typ.)160μA max in operation

0.1μA(Typ.)1.0μA max in shutdown mode

* High current capability:

800mA output

* With ON/OFF circuit:

Ensures long battery life.

* High ripple rejection

70dB typ@1.0kHz

* With over current protector

* With thermal shutdown circuit



ORDERING INFORMATION

Ordering Number

Lead Free

Halogen Free

Package

Packing

L1138BG-xx-AB5-R

L1138BG-xx-AB5-R

SOT-89-5

Tape Reel

L1138BG-xx-AF5-R

L1138BG-xx-AF5-R

SOT-25

Tape Reel

L1138BG-xx-S08-R

L1138BG-xx-S08-R

SOP-8

Tape Reel

xx: Output Voltage, refer to Marking Information.