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General Description

The MIC2846A is a high efficiency White LED (WLED) driver featuring two low quiescent current LDOs. It is designed to drive up to six LEDs and greatly extend battery life for portable display backlighting and keypad backlighting in mobile devices. The MIC2846A architecture provides the highest possible efficiency by eliminating switching losses present in traditional charge pumps or inductive boost circuits. With a typical dropout of 40mV at 20mA, the MIC2846A allows the LEDs to be driven directly from the battery eliminating switching noise and losses present with the use of boost circuitry.

Features

WLED Driver

? High Efficiency (no Voltage Boost losses)

? Dynamic Average Matching? (DAM?)

? Single wire digital control

? Input voltage range: 3.0V to 5.5V

? Dropout of 40mV at 20mA

? Matching better than ±1.5 (typical)

? Current accuracy better than ±1.5 (typical)

? Maintains proper regulation regardless of how many

channels are utilized

LDOs

? Very low ground current – Typical 35μA

? Stable with 1μF ceramic output capacitor

? Dropout at 150mV at 150mA

? Thermal shutdown and current limit protection

? Available in a 2.5mm x 2.5mm 14-pin Thin MLF?

package

Applications

? Mobile handsets

? LCD Handset backlighting

? Handset keypad backlighting

? Digital cameras

? Portable media/MP3 players

? Portable navigation devices (GPS)

? Portable applications