MIC2843 Datasheet | Micrel Semiconductor

Description The MIC2843 is a high-efficiency linear white LED (WLED) driver designed to drive up to six WLEDs, greatly extending battery life for portable display backlighting, keypad backlighting, and camera flash in mobile devices. The MIC2843 provides the highest possible efficiency as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. The MIC2843 provides six linear drivers which maintain constant current for up to six WLEDs. It features a typical dropout of less than 40m V at 20m A. This allows the WLEDs to be driven directly from the battery eliminating switching noise/losses present with the use of boost circuitry. The six channels are matched better than ±3% typical, ensuring uniform display illumination under all conditions. The brightness is controlled through an Ultra Fast PWM™ interface operating down to less than 1% duty cycle. The MIC2843 is available in the 2mm x 2mm 10-pin Thin ® MLF leadless package with a junction temperature range of - 40°C to +125°C. Datasheets and support documentation can be found on Micrel’s web site at: .micrel.. Features - - - - - - - High efficiency (no voltage boost losses) Ultra Fast PWM™ control (200Hz to 500k Hz) Input voltage range: 3.0V to 5.5V Dropout of less than 40m V at 20m A Matching better than ±3% (typical) Current accuracy better than ±1.5% (typical) Maintains proper regulation regardless of how many channels are utilized - Available in a 2mm x 2mm 10-pin Thin MLF® package Applications - Mobile handsets - Digital cameras - Portable media/MP3 players - Portable navigation devices (GPS) - Portable applications Typical Application .. LCD Display Backlight with Six WLEDs Ultra Fast PWM is a trademark of Micrel, Inc. MLF and Micro Lead Frame are registered trademark Amkor Technology Inc. High Current Flash Driver Micrel Inc. - 2180 Fortune Drive - San...