AAT3685

Lithium-Ion/Polymer Battery Charger General Description The AAT3685 BatteryManager™ 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 components. 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. AAT3685 Features BatteryManager™ 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 www.DataSheet4U.com 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 Batt...