AAT3688 Datasheet | AAT

USB Port Lithium-Ion/Polymer Battery Charger General Description The AAT3688 Battery Manager™ is a highly integrated single cell lithium-ion/polymer battery charger IC designed to operate with USB port inputs. It requires the minimum number of external ponents. The AAT3688 precisely regulates battery charge voltage and current for 4.2V lithium-ion/polymer battery cells. Depending on the USB port type, the AAT3688 charge current can be programmed for two separate levels up to 500m A. An optional Charge Reduction Loop is built in to allow users to charge the battery with available current from a USB port, 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 provided to indicate the battery charge status by Applications directly driving two external LEDs. A serial interface .. output is available to report any one of 14 various - Bluetooth™ Headsets status states to a microcontroller. - Cellular Telephones - Digital Still Cameras The AAT3688 is available in a Pb-free, thermally- Hand-Held PCs enhanced, space-saving 12-pin 3x3mm TDFN - MP3 Players package and is rated over the -40°C to +85°C tem- Personal Data Assistants (PDAs) perature range. - Other Lithium-Ion/Polymer Battery-Powered Devices - - - - - - - - - USB Charger - Programmable up to 500m A 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 for USB Charging Battery Temperature Monitoring Full Battery Charge Auto Turn-Off Over-Voltage Protection Emergency Thermal Protection Power On Reset and Soft Start Serial Interface Status...