Power Electronics

IC Combines Charger and Converter Functions

Advanced Analogic Technologies’ AAT2556 is the company’s first multi-function SystemPower IC to combine a battery charger and stepdown converter in a single package. It operates in both fixed and variable frequency modes to support high efficiency levels that range up to 96%.

The stepdown converter in the AAT2556 delivers up to 250 mA of output current. No-load quiescent current is 30μA. The switching frequency is 1.5-MHz.

The battery charger is a complete constant-current/constant-voltage linear charger. Designed to operate from USB or ac adapter inputs from 4.0 V to 6.5 V, it integrates a charging device and reverse blocking diode to regulate battery charge voltage and current for single-cell lithium-ion/polymer batteries. Charging current is programmable from 15 mA to 500 mA via an external resistor.

The AAT2556 was developed using AnalogicTech’s ModularBCD process technology. Unlike conventional BCD technologies, this new process uses a low-temperature, CMOS-like flow capable of achieving high yields while ensuring device performance and electrical isolation.

The AAT2556 is available in a Pb-free, compact 3-mm x 3-mm, 12-pin TDFN package. The device sells for $1.68 each in 1000-piece quantities.


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