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AL3158

HIGH EFFICIENCY 1x/2x CHARGE PUMP

FOR WHITE LED APPLICATIONS

AL3158

Document number: DS35047 Rev. 2 - 2

1 of 10

www.diodes.com

January 2011

NEW PRODUCT

Description

The AL3158 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 AL3158 is capable of

driving three groups of three LED channels at 20mA from a 2.7V to

5.5V input. The current sinks may be operated using three simple

PWM dimming 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

and V

OUT

) make this part ideally

suited for small, battery-powered applications.

AL3158 PWM dimming inputs are used to enable, disable device

and dimming LED current with a fixed default current settings at

20mA or other factory programming options available.

Each output of the AL3158 is equipped with built-in protection for

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

to reduce quiescent current less than 1µA.

The AL3158 is available in a lead-free, space-saving, thermally

enhanced 20-pin 3 x 3mm QFN package.

Features

• V

Range: 2.7V to 5.5V

• Up to 93% Max Power Efficiency

• 1% Current Matching Accuracy Between Channels

• Three simple PWM dimming for RGB or WLED

• Low transition threshold voltage typical 150 mV

• Dual-Mode 1x and 2x Charge Pump

• Drives up to 3 + 3 + 3 Channels of LEDs

• 1.2 MHz Constant Switching Frequency

• V

OUT

short circuit and Thermal Protections

• Soft Start for reducing inrush current

• Under Voltage Lockout Protection

• I

<1µA in Shutdown

• Thermally-Enhanced QFN3030-20 Package: Available in “Green”

Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Pin Assignments

Applications

• Mobile Phone White LED Backlighting and Indicators

• PDA White LED Backlighting

• Battery-operated Phone Main and Sub Screen White LED

Backlighting

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

2.2uF

AL3158

OUT

PGND

1uF

LED

2.2uF

OUT

LED

GND

EN1

EN2

EN3

EN1

EN2

EN3

EN1 EN2

EN3

1 2 3 4 5 6 7 8 9 10

Résumé du contenu

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Page 9 - (Note 9)

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Page 10 - NEW PRODUCT

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