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Power management IC includes seven low dropout regulators

Austriamicrosystems has introduced a highly integrated PMIC (power management IC) for portable devices that are powered by a single-cell Li-ion battery. The AS3605 PMIC integrates seven LDOs (low dropout regulators), a DC/DC converter, a complete battery charger, LED backlight driver and an audio power amplifier on one die. The PMIC is suitable for blood glucose meters, high-end remote controls, global positioning system equipment, mobile meters, e-dictionaries and entry level mobile phones. The PMIC can also be used for CDMA (code division multiple access), wideband CDMA, GSM, general packet radio service, enhanced data rates for GSM evolution, and universal mobile telecommunications system standards.

The seven programmable LDOs feature a noise of 30µV RMS from 100Hz to 100kHz. They also have a line and load regulation of less than 1mV static, less than 10mV transient, and power supply rejection of less than 70dB at 1kHz. The integrated step-down DC/DC converter does not require an external Schottky diode. The company claims that the DC/DC converter's 2.2MHz switching frequency saves PCB space by enabling the use of a low-profile inductor. In addition, a 60mA 5V charge pump together with five programmable current sinks is included to supply LEDs for backlighting the display. The on-chip audio power amplifier provides 1W for speaker-phone operation, and Hi-Fi ringtones.