LR1125

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

2 of 7

www.unisonic.com.tw

QW-R502-416.A

PIN CONFIGURATION

PIN DESCRIPTION

PIN NO

PIN NAME

DESCRIPTION

1, 2

IN

Input. Supply voltage: 2.25V ~ 5.5V. Bypass with a 1µF capacitor to GND. Connect

both input pins together.

3

POK

the POK threshold, this pin remains low. Connect a 100kΩpullup resistor to OUT.

4

SHDN

Active-Low Shutdown Input. At this pin, a logic low reduces supply current to 0.02µA.

In shutdown, the POK output is low. For normal operation Connect SHDN to IN.

5

GND

Ground.

6

SET

Voltage-Setting Input. For preset output, connect this pin to GND. Connect an external

resistive voltage-divider from OUT to this pin to set the output voltage from 0.8V to

4.5V. This pin regulation voltage is 800mV.

7, 8

OUT

Regulator Output (up to 500mA). This pin should be bypassed with a 10µF low-ESR

capacitor to GND. Connect both OUT pins together.