UNISONIC TECHNOLOGIES CO., LTD

LR9272

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 5

Copyright © 2015 Unisonic Technologies Co., Ltd

QW-R102-067.a

SUPER LOW ON RESISTANCE /

LOW VOLTAGE 1A LDO



DESCRIPTION

The UTC LR9272 is a typical LDO (linear regulator) with the

features of high output voltage accuracy, low supply current, low

ON-resistance, super low dropout, 1A output current capability, and

high ripple rejection.

During operation of the UTC LR9272, the dropout voltage is

very low, Even the output voltage is set at 1.5V, on resistance of

internal FET is typically 0.32Ω. Therefore, applications that require

a large current at small dropout are suitable for the UTC LR9272

series. Low input voltage is acceptable and low output voltage can

be set. The minimum input voltage is 1.4V, and the lowest set

output voltage is 0.8V, and the response of line transient and load

transient are very well.

Internally, there’re many functions of UTC LR9272 which can

be seen in the block figure. There are a voltage reference unit, an

error amplifier, resistor-net for voltage setting, a current limit circuit,

and a chip enable circuit in each UTC LR9272.

The UTC LR9272 can be used as an ideal of the power supply

for hand-held communication equipment, such as: power source for

portable communication equipment, power source for electrical

appliances, for example, cameras, VCRs and camcorders and

power source for battery-powered equipment.



FEATURES

* Low standby current (TYP=0.1µA)

* Ultra-Low supply current (TYP=60µA)

* Output voltage accuracy (±2.0%)

* Input voltage range (1.4V~6.0V)

* Output voltage (0.8V~5.0V)

* Line regulation (TYP=0.05%/V)

* Low temperature-drift coefficient of output voltage

* Built-in thermal shuntdown circuit

* Built-in inrush current limit circuit

* Built-in fold-back protection circuit

* Built-in auto discharge function



ORDERING INFORMATION

Pin Assignment

Ordering Number

Package

Pin Code

1

2

3

Packing

LR9272G-xx-AA3-C-R

SOT-223

C

G

I

O

Tape Reel

LR9272G-xx-AF5-R

SOT-25

Refer to PIN CONFIGURATION

Tape Reel

Note: xx: Output Voltage, refer to Marking Information.