基于AAT3698-1-2设计的1.6A线性锂电池充电方案

本文介绍了AAT3698-1/-2主要特性，功能方框图，典型应用电路以及AAT3698-1/-2评估板电路图和评估板材料清单（BOM）。AnalogicTech公司的 AAT3698-1/-2 BatteryManager™是单节锂离子/锂聚合物电池线性充电器，输入电源为USB端口，或输入电压高达7.0V的AC适配器。为安全起见，AAT3698- 1/-2还包括高达28V的过压保护。LDO输出5V/50mA，可编程快速充电电流从50mA到1.6A，主要用在蓝牙手机，耳机及配件，数码相机，手机，PDA，MP3播放器等。

AAT3698-1/-2主要特性：

• USB or AC Adapter System Power Charger

• 3.0V ~ 7.0V Input Voltage Range

• Fast Over-Voltage ProtecTIon Turn Off

• OVP Trip Threshold: 7.25V (typ)

• High Level of IntegraTIon with Internal:

▪ Power Device

▪ Reverse Current Blocking

▪ Current Sensing

• 5V/50mA LDO Output

• Programmable Fast Charge Current from 50mA to 1.6A

• Programmable Charge TerminaTIon Current

• Charge Status Indicator

• Power OK Indicator

• Battery Absence DetecTIon Input Pin

• Automatic Termination and Recharge Sequencing (AAT3698-1 Only)

• Automatic Trickle Charge For Battery Pre-Conditioning

• Emergency Thermal Shutdown Protection

• Digitally Controlled Thermal Loop Regulation

• Active Low Enable with Internal 200kΩ Pull-Down Resistor

• Output for Auto-Booting

• 14-pin 3x3mm TDFN Package

AAT3698-1/-2应用：

• Bluetooth™ Headsets, Headphones, Accessories

• Digital Still Cameras

• Mobile Telephones

• Personal Data Assistants (PDAs)

• MP3 Players

• Other Lithium-Ion/Polymer Battery-Powered Devices


图1。AAT3698-1/-2功能方框图

图2。AAT3698-1/-2典型应用电路图

图3。AAT3698-1/-2评估板电路图
AAT3698-1/-2评估板材料清单（BOM）：