Chapter 290

Tiny universal LED driver can gradate, blink or turn on nine individual LEDs with minimal external control

Marty Merchant

Abstract

A tiny universal LED driver that can gradate, blink or turn on nine individual LEDs with minimal external control is described.

Keywords

LED driver

charge pump

cell phone

LTC3219

Introduction

LEDs are the lighting workhorse of cell phones, MP3 players and diagnostic lights in telecom systems. Their uses are many, from utilitarian backlighting to eye-catching aesthetic effects such as slowly pulsing multicolor indicators. As device designers strive to differentiate their products on the shelf, the number and complexity of lighting effects grows. It would seem that each new effect requires significant ...

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