原标题：AnalogicTech AAT3698-1(2)1.6A线性锂电池充电方案

　　AnalogicTech公司的 AAT3698-1/AAT3698-2 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。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)。

　　1.6A Linear Li-Ion Battery Charger in 3x3 TDFN

　　The AAT3698-1/-2 BatteryManager™ is a single-cell lithium-ion (Li-Ion)/Li-Polymer battery charger IC designed to operate from a USB port or AC adapter with an input voltage of up to 7.0V. For increased safety, the AAT3698- 1/-2 also includes over-voltage input protection (OVP) up to 28V.

　　The AAT3698-1/-2 precisely regulates battery voltage for 4.2V Li-Ion/Polymer battery cells through a low RDS(ON) switch. The charging current can be set by an external resistor up to 1.6A. If an over-voltage condition occurs from the input, the series switch quickly opens and a fault flag is activated, preventing damage to the battery and the charging circuitry.

　　Other fault conditions are monitored in real time. In case of an over-current, battery over-voltage, short circuit, or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. A status monitoring output pin (STAT) is provided to indicate charging activity. This open drain output pin can be used to drive an external LED as a charging indicator.

　　The AAT3698-1/-2 also includes a 5.0V LDO linear regulator with over-voltage protection that can supply loads of up to 50mA.

　　The AAT3698-1/-2 is available in the Pb-free, thermally enhanced, space-saving 3x3mm TDFN33-14 package and is rated over the -40℃ to +85℃ temperature range.

　　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)：