Chapter 287

Triple LED driver in 4mm × 5mm QFN supports LCD backlights in buck, boost or buck-boost modes and delivers 3000:1 PWM dimming ratio

Hua (Walker) Bai

Abstract

A triple LED driver that supports LCD backlights in buck, boost or buck-boost modes and delivers 3000:1 PWM dimming ratio is described.

Keywords

Multiple output LED driver

PWM dimming

LT3496

Introduction

By integrating three independent LED drivers, the LT3496 offers a highly efficient, compact and cost-effective solution to drive multiple LED strings. All three drivers have independent on/off and PWM dimming control, and can drive different numbers or types of LEDs. High side current sensing and built-in gate drivers for PMOS LED disconnect allow the LT3496 to operate ...

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