AAT2550

Total Power Solution for Portable Applications General Description The AAT2550 is a fully integrated total power solution with two step-down converters plus a singlecell lithium-ion / polymer battery charger. The stepdown converter input voltage range spans 2.7V to 5.5V, making the AAT2550 ideal for systems powered by single-cell lithium-ion/polymer batteries. The battery charger is a complete constant current/ constant voltage linear charger. It offers an integrated pass device, reverse blocking protection, high current accuracy and voltage regulation, charge status, and charge termination. The charging current is programmable via external resistor from 100mA to 1A. In addition to these standard features, the device offers over-voltage, over-current, and thermal protection. AAT2550 Features SystemPower™ The two step-down converters are highly integrated, operating at a switching frequency of 1.4MHz, mini mizing the size of external components while keep ing switching losses low. Each converter has independent input, enable, and feedback pins. The output voltage ranges from 0.6V to VIN. Each converter www.DataSheet4U.com is capable of delivering up to 600mA of load current. Applications The AAT2550 is available in a Pb-free, space-saving, thermally-enhanced QFN44-24 package and is rated over the -40°C to +85°C temperature range. Two Step-Down Converters: — 600mA Output Current per Converter — VIN Range: 2.7V to 5.5V — 1.4MHz Switching Frequency — Low R...