AL3157 datasheet(2/9 Pages) DIODES

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AL3157

HIGH EFFICIENCY 1x/2x CHARGE PUMP LED DRIVER

FOR SMALL SCREEN BACKLIGHTING AND FLASHLIGHT

AL3157

Document number: DS35116 Rev. 1 - 2

2 of 9

www.diodes.com

March 2011

Pin Descriptions

Pin Name

Pin Number

Description

EN2

Enable Pin 2: Controls outputs D2, D3 and D4

PGND

Charge Pump Switch Ground: Connect to GND

Negative Terminal of Flying Capacitor

VIN

Input Power Supply. Decouple with a 2.2µF capacitor between this pin and ground.

Positive Terminal of Flying Capacitor

VOUT

Charge pump output to drive D1~D4 load circuit. Decouple with a 2.2µF capacitor between

this pin and ground.

Current sink input #4. Drive up to 30mA LED current. Connect to VOUT when un-used.

Current sink input #3. Drive up to 30mA LED current. Connect to VOUT when un-used.

GND

Ground

Current sink input #2. Drive up to 30mA LED current. Connect to VOUT when un-used.

EN1

Enable Pin 1: Controls output D1

Current sink input #1. Drive up to 210mA LED current. Connect to VOUT when un-used.

EP PAD

Exposed Pad (bottom). Connect to GND directly underneath the package.

Functional Block Diagram

SHORT

CIRCUIT

PROTECTION

VIN

GND

CURRENT

CONTROL

CHARGE PUMP

SWITCHES

VOUT

OVER

VOLTAGE

PROTECTION

EN1

UNDER

VOLTAGE

LOCKOUT

BANDGAP

OSCILLATOR

OVER

TEMPERATURE

PROTECTION

EN2

DIGITAL CONTROL BLOCK

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