The AS3603 is a highly-integrated CMOS power management device designed specifically for portable devices such as any mobile phone standard, PDAs, CD players, digital cameras and other devices powered by 1-cell lithium-based or 3- to 4-cell nickel-based batteries. The device incorporates low dropout regulators (LDOs), DC/DC converters, a complete battery charger, and an audio power amplifier onto one die.