Intersil ISL9220（A）锂离子电池通用充电方案

Intersil 公司的ISL9220/ISL9220A是高性价比单节和两节锂离子和锂聚合物电池的通用充电器，具有同步PWM技术，以最大化电源效率，从而最大限度降低了充电时间和热量。1.2MHz开关频率允许是用小型电感和电容。充电电流高达2A，充电精度0.5%，主要用在PDA和智能手机，MP3和PMP，手持GPS设备，数码相机和工业手持扫描仪。本文介绍了ISL9220/ISL9220A主要特性，方框图以及单节和两节电池应用电路图。

The ISL9220, ISL9220A is a cost-effective and versatile battery charger for 1-cell and 2-cell Li-ion and Li-Polymer based portable applications.

The device features synchronous PWM technology, maximizing power efficiency, thus minimizing charge time and heat. The 1.2MHz switching frequency allows use of small external inductors and capacitors.

A simple charge current programming method is provided. External resistors program the fast charge and end-of-charge currents.

The two status outputs can be used to drive LEDs, or can be connected to host processor.
A programmable charge timer provides the ability to detect defective batteries, and provides a secondary method of detecting charge termination.

A thermistor interface is provided for battery presence detection, and for temperature qualified charging conditions.
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