MIC2842A Datasheet | Micrel Semiconductor

Description Features The MIC2842A is a high efficiency White LED (WLED) - High Efficiency (no Voltage Boost losses) driver designed to drive up to four LEDs and greatly - Dynamic Average Matching™ (DAM™) extend battery life for portable display backlighting, and - Single wire digital control keypad backlighting in mobile devices. The MIC2842A - Input voltage range: 3.0V to 5.5V architecture provides the highest possible efficiency by - Dropout of 40m V at 20m A eliminating switching losses present in traditional charge pumps or inductive boost circuits. With a typical dropout of - Matching better than ±1.5% (typical) 40m V at 20m A, the MIC2842A allows the LEDs to be - Current accuracy better than ±1.5% (typical) driven directly from the battery eliminating switching noise - Maintains proper regulation regardless of how many and losses present with the use of boost circuitry. channels are utilized The MIC2842A features Dynamic Average Matching™ - Available in a 10-pin 2mm x 2mm Thin MLF® package (DAM™) which is specifically designed to provide optimum matching across all WLEDs. The four channels are Applications matched better than ±1.5% typical, ensuring uniform display illumination under all conditions. The LED - Mobile handsets brightness is preset by an external resistor and can be - Handset LCD backlighting dimmed using a single-wire digital control. The digital - Handset keypad backlighting interface takes mands from digital programming pulses to change the brightness in a logarithmic scale - Camera flash (see MIC2843A datasheet) similar to the eye’s perception of brightness. The single- Digital cameras wire digital brightness control is divided into two modes of - Portable media/MP3 players operation; full brightness mode or battery saving mode for a total of 49 brightness steps. - Portable navigation devices (GPS) The MIC2842A is available in the 2mm x 2mm 10-pin Thin - Portable application MLF® leadless package with a junction temperature range of -40°C to...