Analog Circuit Design Volume Three

Chapter 206

Li-Ion linear charger allows fast, full current charging while limiting PC board temperature to 85°C

Fran Hoffart

Abstract

The LTC1733, a Li-Ion linear charger that allows fast, full current charging while limiting PC board temperature to 85°C, is described.

Keywords

Li-Ion battery

linear charger

LTC1733

Introduction

Linear battery chargers are typically smaller, simpler and less expensive than their switcher-based counter parts, but they have one major disadvantage: excessive power dissipation when the input voltage is high and the battery voltage is low (discharged battery). Typically, such conditions are temporary—as the battery’s voltage rises with its charge—but one must consider this worst-case situation when determining ...