| Description & Applications | 500mA Battery Charger and 300mA LDO Regulator for Portable Systems The AAT2557 is a fully integrated 500mA battery charger and a 300mA low dropout linear regulator. The input voltage range is 4V to 6.5V for the battery charger and 2.7V to 5.5V for the linear regulator. It offers an integrated pass device, reverse blocking protection, high accuracy current and voltage regulation. The charging current is programmable. In addition to these standard features, the device offers over-voltage, current limit, and thermal protection.Applications：Bluetooth Headsets Cellular and DECT Phones Handheld Instruments MP3 and Portable Music Players PDAs and Handheld Computers Portable Media Players |