UNISONIC TECHNOLOGIES CO., LTD

L1923

Preliminary

CMOS IC

www.unisonic.com.tw

1 of 7

Copyright © 2011 Unisonic Technologies Co., Ltd

QW-R502-440.c

500mA HIGH PSRR LDO

REGULATORS

DESCRIPTION

The UTC L1923 is a low supply current, low dropout linear regulator.

It is operating at 2.5V - 5.5V. The supply current is as low as 55μA in

the no–load condition. In the shutdown mode, the maximum supply

current is less than 1μA.

A built-in over-temperature protection circuit is designed to protect

the device from being damaged by thermal overload. The over-current

protection limit is set at 800mA (TYP.)

The UTC L1923 can be operated on the following two modes. When

the SET pin is connected to ground, the output of L1923 is a pre-set

value and the external components are not needed to decide the

output voltage. When an output other than the preset value is needed,

two external resistors should be used as voltage dividers and then the

output voltage is decided by the resistor ratio.

The UTC L1923 is generally used in notebook computers, cellular

phones, PDAs, digital still camera and video recorders and other

hand-held devices.

FEATURES

* Low No-Load Supply Current: 90µA

* Guaranteed 500mA Output Current

* Dropout Voltage is 200mV @ 250mA Load

*OTP(Over-Temperature Protection) and Short-Circuit Protection

* Two Modes Of Operation:

Fixed Mode：3.3V,3.5V,3.9V

Adjustable Mode: 1.25V - 5.5V

* Maximum Supply Current In Shutdown Mode is Less than 1µA

* Low Output Noise at 238µVRMS

* Stability with Lost Cost Ceramic Capacitors

ORDERING INFORMATION

Ordering Number

Package

Packing

Lead Free

Halogen Free

L1923L-xx-AF5-R

L1923G-xx-AF5-R

SOT-25

Tape Reel

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