AAT3685 Datasheet | AAT

Lithium-Ion/Polymer Battery Charger General Description The AAT3685 Battery Manager™ is a highly integrated single cell lithium-ion/polymer battery charger IC designed to operate with USB port or line adapter inputs. It requires the minimum number of external ponents. The AAT3685 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. Regardless of the type of input power source (USB or adapter), the AAT3685 can be programmed for two separate constant current charge levels up to 1A. An optional Charge Reduction Loop is built in to allow users to charge the battery with available current from the charge supply, while keeping the port voltage regulated. Features - - - Battery Manager™ Battery temperature and charge state are fully monitored for fault conditions. In the event of an over-voltage or over-temperature failure, the device will automatically shut down, thus protecting the charging device, control system, and the battery under charge. Status monitor output pins are Applications provided to indicate the battery charge status by .. directly driving two external LEDs. A serial interface - Cellular Telephones output is available to report any one of 14 various - Digital Still Cameras status states to a microcontroller. - Hand-Held PCs - MP3 Players The AAT3685 is available in a Pb-free, thermally- Personal Data Assistants (PDAs) enhanced, space-saving 12-pin 3x3mm TDFN - Other Lithium-Ion/Polymer Battery-Powered package and is rated over the -40°C to +85°C tem Devices perature range. - - - - - - - - - Adapter or USB Charger - Programmable up to 1A Max 4.0V to 5.5V Input Voltage Range High Level of Integration With Internal: - Charging Device - Reverse Blocking Diode - Current Sensing Automatic Recharge Sequencing Charge Reduction Loop Battery Temperature Monitoring Full Battery Charge Auto Turn-Off Over-Voltage Protection Emergency Thermal Protection Power On Reset and Soft Start Serial...