MIC2860-D

High Efficiency 2 Channel WLED Driver

with Single Wire Digital Control

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (

General Description

The MIC2860-2D is a high efficiency White LED (WLED)

driver designed to drive two WLEDs and greatly extend

battery life for portable display backlighting, and keypad

backlighting in low cost mobile devices. The MIC2860-2D

architecture provides the highest possible efficiency by

eliminating switching losses present in traditional charge

pumps or inductive boost circuits. It features a typical

dropout of 52mV at 30.2mA per channel. This allows the

WLEDs to be driven directly from the battery eliminating

switching noise and losses present with the use of boost

circuitry.

The two channels have better than ±0.5% matching, which

ensures uniform display illumination under all conditions.

The WLEDs brightness is externally preset by a resistor

and dimmed using a single wire digital control signal. The

MIC2860-2D single wire digital interface accepts digital

programming pulses providing 32 dimming steps.

The MIC2860-2D is available in Thin SOT-23 and SC-70

six pin packages with a junction temperature range of

-40

°C to +125°C.

Datasheets and support documentation can be found on

Micrel’s web site at: www.micrel.com.

Features

• High Efficiency (no switching losses)

• No charge pumps

• 2 WLED driver channels

• Single wire digital control

• Input voltage range: 3.0V to 5.5V

• WLED driver dropout of 52mV at 30.2mA

• Matching better than ±0.5% (typical)

• Current Accuracy better than ±1.0% (typical)

• Available in Thin SOT-23 and SC-70 6 pin packages

Applications

• Mobile handsets

• Digital cameras

• Portable media/MP3 players

• Portable navigation devices (GPS)

• Portable applications

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Typical Application

LCD Display Backlight with 2 WLEDs

July 2010

M9999-072010-A