MIC2844A Datasheet | Micrel Semiconductor

Description Features The MIC2844A is a high efficiency linear White LED (WLED) - High Efficiency (no Voltage Boost losses) driver designed to drive up to six WLEDs, greatly extending - Dynamic Average Matching™ (DAM™) battery life for portable display backlighting keypad - Single wire digital control backlighting, and camera flash in mobile devices. The - Input voltage range: 3.0V to 5.5V MIC2844A provides the highest possible efficiency as this - Dropout of 40m V at 20m A architecture has no switching losses present in traditional charge pumps or inductive boost circuits. The MIC2844A - Matching better than ±1.5% (typical) provides six linear drivers which maintain constant current for - Current accuracy better than ±1.5% (typical) up to six WLEDs. It features a typical dropout of 40m V at - Maintains proper regulation regardless of how many 20m A. This allows the WLEDs to be driven directly from the channels are utilized battery eliminating switching noise/losses present with the - Available in a 10-pin 2mm x 2mm Thin MLF® package use of boost circuitry. The MIC2844A features Dynamic Average Matching™ Applications (DAM™) which is specifically designed to provide optimum matching across all WLEDs. The six channels are matched - Mobile handsets better than ±1.5% typical, ensuring uniform display - Handset LCD backlighting illumination under all conditions. The LED brightness is preset - Handset keypad backlighting by an external resistor and can be dimmed using a singlewire digital control. The digital interface takes mands - Camera flash (see MIC2843A datasheet) from digital programming pulses to change the brightness in - Digital cameras a logarithmic scale similar to the eye’s perception of - Portable media/MP3 players brightness. The single-wire digital brightness control is divided into two modes of operation; full brightness mode, or - Portable navigation devices (GPS) battery saving mode for a total of 49 brightness steps. - Portable applications The MIC2844A...