A power management integrated circuit (PMIC) designed specifically for portable devices, powered by a single-cell Li-Ion battery has been released by Austriamicrosystems. The AS3605 integrates seven low dropout regulators (LDOs), a DC/DC converter, a complete battery charger, LED backlight driver and an audio power amplifier.
The features allow it to be used in many portable devices powered by one Li-Ion battery such as high-end blood glucose meters, remote controls, GPS equipment, mobile meters, e-dictionaries and entry-level mobile phones. It can be used for any entry-level mobile phone handset standard, including CDMA, WCDMA, GSM, GPRS, EDGE, UTMS and other standards.
The seven high-performance programmable LDOs feature low noise – typically 30 µV RMS from 100 Hz to 100 kHz – as well as line/load regulation < 1 mV static, < 10 mV transient, and power supply rejection less than 70 dB @ 1 kHz.
The integrated step-down DC/DC converter requires no external Schottky diode yet provides very high efficiency (up to 95%) throughout the whole operating range. The DC/DC converter’s 2.2 MHz switching frequency saves PCB space by enabling the use of a tiny, low profile inductor.