Description

The AS3603 is a highly-integrated, ultra-flexible CMOS power management device designed specifically for portable devices such as any standard of mobile phones, PDAs, CD players, digital cameras and other devices powered by 1-cell lithiumbased or 3- 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.

The linear analog LDOs feature extremely high performance regarding:

• Noise – typ 30 µ VRMS from 100Hz to 100kHz
• Line/Load Regulation – < 1mV static and < 10mV transient
• Power Supply Rejection – > 70dB @ 1kHz

The integrated Step Down DC-DC Converter does not require an external Schottky diode yet provides very high efficiency (up to 95%) throughout the whole operating range. It can be either used as a stand-alone device or as a pre-regulator for LDOs to increase overall device efficiency.

Step Up DC-DC Converter is included to supply power for white LEDs together with programmable current sources to control LED brightness.

A low-distortion audio power amplifier (1 Watt @ 8) supports handsfree mobile phone operation and HiFi ringtones.

The device also features a chemistry-independent battery charger including fuel gauge circuitry, automatic trickle charging, programmable constant current, constant voltage and pulse charging.

The AS3603 is controlled via a serial interface and integrates all necessary system specific functions such as Reset, Watchdog, and Power-On Detection.

Regulator output voltages are programmable by software. Eight preset startup timings can be selected by an external resistor.