Advanced Analogic Technologies Incorporated announced the AAT3663, the first in a family of 1A linear battery charger ICs capable of charging up to two Li-ion cells in series. Designed to operate from either an AC adapter or a USB port, this device features the company’s Digital Thermal Loop charge reduction circuit which monitors the internal die temperature and gradually steps down the charge current to avoid thermal shutdown. The IC operates across a 4.0V to 13.2V input voltage range and supports user programmable charge current from 100 mA up to 1A via an external resistor. Quiescent current is less than 6 µA. The device features an intelligent digital thermal loop charge reduction circuit which optimizes battery charge rate by constantly measuring die temperature and adjusting the charge current to compensate for thermal conditions. The charger IC also features a programmable charge termination current feature which sends the device into sleep mode if the charging current dips below a pre-defined threshold. An integrated programmable charge timer can be used to shut down charging functions if a defective battery cell or a disconnection to the battery current path is detected. Specified for operation across the -40°C to +85°C temperature range, the AAT3663 is available in a thermally-enhanced 14-pin, 3 mm × 3 mm TDFN package. It sells for $1.38 in 1,000 quantities.
Advanced Analogic Technologies