Power Electronics

IC Charges Single or Dual-Cell Li-ion Packs

From Advanced Analogic Technologies, the AAT3663 is a 1-A linear battery charger IC capable of charging up to two Li-ion cells in series. Designed to operate from either an ac adapter or 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 AAT3663 operates across a 4.0-V to 13.2-V input range and supports user programmable charge current from 100 mA up to 1 A via an external resistor. Quiescent current is less than 6 µA. 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 cell or a disconnection to the battery current path is detected. The AAT3663 comes in a 14-pin, 3-mm x 3-mm TDFN. Unit pricing is $1.38 in 1000-piece quantities.

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