原标题：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.

　　Additional features include preconditioning of an over-discharged battery, automatic recharge, and thermally enhanced QFN package.

　　ISL9220/ISL9220A主要特性：

　　• Highly Integrated Battery Charger IC

　　• Charges 1- and 2-Cell Li-ion or Li-Polymer Batteries

　　• Up to 2A Charge Current

　　• Synchronous Buck Topology with Integrated Power FETs

　　• 1.2MHz Switching Frequency

　　• 0.5% Charge Voltage Accuracy

　　• Programmable Input Current Limit with One External Resistor

　　• Thermistor Interface for Battery Detection and Temperature Qualified Charging

　　• Two Status Outputs

　　• Programmable Charge Safety Timer

　　• Short-Circuit and Thermal Protection

　　• Small 4mmx4mm TQFN Package

　　• -40℃ to +85℃ Operating Temperature Range

　　ISL9220/ISL9220A应用：

　　• PDAs and Smart Phones

　　• MP3 and Portable Media Players

　　• Handheld GPS Devices

　　• Digital Still Cameras

　　• Industrial Handheld Scanners

　　图1。ISL9220/ISL9220A方框图

　　图2。ISL9220/ISL9220A热敏电阻内部电路图

　　图3。ISL9220/ISL9220A单节电池应用电路图

　　图4。ISL9220/ISL9220A两节电池应用电路图