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Battery charger IC charges up to two Li-ion cells in series

Santa Clara, Calif. — Advanced Analogic Technologies has introduced the first device in a family of new 1-A 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, the AAT3663 device features AnalogicTech'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 voltage range and supports user programmable charge current from 100 mA up to 1 A via an external resistor. Quiescent current is less than 6 uA. By supporting input voltages up to 13.2 V, the AAT3663 provides designers with a device that can replace larger and more expensive charging solutions with a highly integrated and more cost-effective alternative, said AnalogicTech.

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. Unlike many competitive charger ICs, this closed loop thermal management system allows the charger to continue charging even under harsh environmental conditions, therefore minimizing charge time, said the company.

The charger IC also features a programmable charge termination current feature that 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.

The AAT3663 continuously monitors battery temperature and charge state for fault conditions. To protect the charging device, and the battery under charge, integrated over-temperature, short-circuit, over-voltage and over-current protection circuits automatically shuts down the device if a fault occurs. The device is specified for operation across the -40°C to +85°C temperature range. It is available in a thermally-enhanced 14-pin, 3 x 3-mm TDFN package.

Pricing: $1.38 in quantities of 1,000.
Product information: AAT3663

Advanced Analogic Technologies, Inc. , www.analogictech.com

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