Analogic AAT3783 1A锂离子电池充电方案

Analogic公司的 AAT3783是 1A锂离子电池/锂聚合体电池充电器,可从USB端口,AC适配器输入,电源电压高达6.5V,过压保护输入(OVP)高达28V,以增加安全性. AAT3783的电流可编成,从100mA 到1A,主要用在蓝牙手机,数码相机,移动手机,MP3播放器,PDA以及其它以锂离子电池/锂聚合体电池为电源的设备.本文介绍了AAT3783的主要特性,功能方框图,典型应用电路图以及AAT3783评估板电路图与评估板材料清单.

1-A Linear Li-Ion/Polymer Battery Charger with 28V Over-Voltage Protection

The AAT3783 BatteryManager is a single-cell Lithium-Ion (Li-Ion)/Li-Polymer battery charger IC, designed to operate from USB ports, AC adapter inputs, or from a charger adapter up to an input voltage of 6.5V. For increased safety, the AAT3783 also includes over-voltage input protection (OVP) up to 28V.
The AAT3783 precisely regulates battery charge voltage and current for 4.2V Li-Ion/Polymer battery cells through an extremely low RDS(ON) switch. When charged from an adapter or a USB port, the battery charging current can be set by an external resistor up to 1A. In the case of an over-voltage condition in excess of 6.5V, a series switch opens preventing damage to the battery and charging circuitry. With the addition of an external resistor the OVP trip point can be programmed to a level other than the factory set value of 6.5V. In the case of an OVP condition a fault flag is activated.

Battery charge state is continuously monitored for fault conditions. In the event of an over-current, battery overvoltage, 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 monitor output pin is provided to indicate the battery charge status by directly driving an external LED. An open-drain power-source detection

output (ADPP) is provided to report the power supply status.
The AAT3783 comes in a thermally enhanced, spacesaving, Pb-free 16-pin 3x4 mm TDFN package and is specified for operation over the -40°C to +85°C temperature range.

AAT3783 主要特性:
USB or AC Adapter System Power Charger
Programmable from 100mA to 1A Max
4.0V ~ 7.5V Input Voltage Range
Over-Voltage Input Protection up to 28V
High Level of Integration with Internal:
Charging Device
Reverse Blocking Diode
Current Sensing
Digital Thermal Regulation
Charge Current Programming (ISET)
Charge Termination Current Programming (TERM)
Charge Timer (CT)
Battery Temperature Sensing (TS)
TS Pin Open Detection
Automatic Recharge Sequencing
No Trickle Charge Option Available
Full Battery Charge Auto Turn Off / Sleep State /Charge Termination
Automatic Trickle Charge for Battery Pre-conditioning
Battery Over-Voltage and Over-Current Protection
Emergency Thermal Protection
Power On Reset
16-pin 3x4mm TDFN Package
AAT3783 主要应用:
Bluetooth Headsets, Headphones, Accessories
Digital Still Cameras
Mobile Phones
MP3 Players
Personal Data Assistants (PDAs)
Other Li-Ion/Polymer Battery Powered Devices



图1.AAT3783功能方框图



图2.AAT3783典型应用电路



图3.AAT3783评估板电路图
AAT3783评估板材料清单(BOM):