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General Description

The MIC2845A is a high efficiency White LED (WLED) driver designed to drive up to six LEDs, greatly extending battery life for portable display backlighting, keypad backlighting, and camera flash in mobile devices. The MIC2845A provides the highest possible efficiency as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. The MIC2845A provides six linear drivers channels which maintain constant current for up to six LEDs. It features a typical dropout of 40mV at 20mA. This allows the LEDs to be driven directly from the battery eliminating switching noise/losses present with the use of boost circuitry.

Features

WLED Driver

? High Efficiency (no Voltage Boost losses)

? Dynamic Average Matching? (DAM?)

? Ultra Fast PWM? control (200Hz to 500kHz)

? 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 of 150mV at 150mA

? Thermal shutdown and current limit protection

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

package

Applications

? Mobile handsets

? LCD Handset backlighting

? Handset keypad backlighting

? Digital cameras

? Portable media/MP3 players

? Portable navigation devices (GPS)

? Portable applications