MIC3263 - Micrel Semiconductor

MIC3263 Six-Channel WLED Driver for Backlighting Applications

The MIC3263 is a high-efficiency Pulse Width Modulation (PWM) boost switching regulator that is optimized for constant-current WLED driver backlighting applications. The MIC3263 drives six channels of up to ten WLEDs per channel. Each channel is matched in current to within ±3% for constant brightness across the screen and can be programmed from 15mA to 30mA.

Features

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• 6V to 40V wide input voltage range Drives 6 channels of up to 10 white LEDs Programmable WLED current from 15mA to 30mA Highly reliable operation with open and short LEDs Accurate 16 dimming log levels sets the dimming ratio from 1% to 100% Flicker-Free Dimming filters the jitter from the dimming control input signal and eliminates dimming flicker Allows external dimming control Accurate LED channel current matching ±3% Accurate initial LED current setting ±2% Programmable switching frequency from 400kHz to 1.8MHz High efficiency up to 90% Low (<40μA) shutdown c.