AL3159FSG-7【PDF 1/10 页】IC LED DRVR CHG/PMP QFN3030-20

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AL3159

HIGH EFFICIENCY 1x/2x CHARGE PUMP

FOR WHITE LED APPLICATIONS

Description

The AL3159 is a low noise, constant frequency charge pump

DC/DC converter that uses a Dual mode load switch (1x), and (2x)

conversion for white LED applications. The AL3159 is capable of

driving nine LED channels at 20mA from a 2.7V to 5.5V input. The

current sinks may be operated using three simple logic control

inputs individually or in parallel for driving higher-current LEDs. Low

external part counts (one 1μF flying capacitor and two

2.2μF capacitors at V IN and V OUT ) make this part ideally suited for

small, battery-powered applications.

AL3159 digital inputs are used to enable or disable the

LED channels with a fixed default current settings at 20mA or other

factory programming options available.

Each output of the AL3159 is equipped with built-in protection for

V OUT short circuit and auto-disable for LED short conditions. Built-in

soft-start circuitry prevents excessive inrush current during start-up

and mode switching. A low-current shutdown feature disconnects

the load from V IN to reduce quiescent current less than 1μA.

The AL3159 is available in a lead-free, space-saving, thermally

enhanced 20-pin 3 x 3mm QFN package.

Features

Pin Assignments

Applications

V IN range: 2.7V to 5.5V

Up to 93% Max Power Efficiency

1% Current Matching Accuracy Between Channels

Drives up to 9 configurable Channels of LEDs

Three simple logic decoding LED On/Off control inputs

Low transition threshold voltage typical 150 mV

Dual-Mode 1x and 2x Charge Pump

1.2 MHz Constant Switching Frequency

V OUT short circuit and Thermal Protections

Soft Start for reducing inrush current

I Q <1μA in Shutdown

Thermally-Enhanced QFN3030-20 Package: Available in

Mobile Phone White LED Backlighting and Indicators

PDA White LED backlighting

Battery-operated Phone Main and Sub Screen White LED

Backlighting

“Green” Molding Compound (No Br, Sb)

Lead Free Finish/ RoHS Compliant (Note 1)

Notes:

1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at

http://www.diodes.com/products/lead_free.html

Typical Application Circuit

AL3159

Document number: DS35048 Rev. 2 - 2

1 of 10

www.diodes.com

January 2011

? Diodes Incorporated

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