Programmable up to 1A USB Port/AC Adapter Li-Ion Battery Charger w/ OVP TDFN34-16
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 R DSON 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 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 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, space-saving, Pb-free 16-pin 3x4 mm TDFN package and is specified for operation over the -40°C to +85°C temperature range.