AS3603

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.

AS3603 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 VRMS from 100Hz to 100kHz

• Noise typ 30 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 AS3603 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.

AS3603 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 of AS3603 are programmable by software. Eight preset startup timings can be selected by an external resistor.