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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 312

High efficiency USB power management system safely charges Li-Ion/polymer batteries from automotive supplies

George H. Barbehenn

Abstract

A high efficiency USB power management system that safely charges Li-Ion/Polymer batteries from automotive supplies is described.

Keywords

LT3480 high voltage step-down regulator

LTC4098 Li-Ion/Polymer battery charger

Introduction

Automotive power systems are unforgiving electronic environments. Transients to 90V can occur when the nominal voltage range is 10V to 15V (ISO7637), along with battery reversal in some cases. It is fairly straightforward to build automotive electronics around this system, but increasingly end-users want to operate portable electronics, such as GPS systems ...

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