Power management in integrated package

The PMIC is suitable for portable navigation devices, portable media players, e-dictionaries, gps devices and a range of battery powered hand held devices using ARM based processors. The output voltage and the timing of all regulators of the AS3607 are programmed via software. With the software and demo board, the OTP memory of the AS3607 can be programmed, while the slope of the ramp can be set for the step down converters. The user can programme the start up sequence with timing steps of 1 or 4ms, insuring that all ARM-based processors can easily be covered. In order to control other parts of the system, the general purpose I/O pins can be programmed to a specific timing. The PMIC and application processor manage and optimise the power rails within the system to maximise battery charge. The AS3607 power management unit includes: three DC-DC step down converters and five low noise LDO regulators suitable for rf applications, an LED backlight driver, two programmable current sinks and a Li-ion battery charger. The three step-down converters deliver 700mA each with an efficiency of up to 95%. The AS3607 is available in a QFN36, 6 x 6mm, 0.5mm pitch package and has an operating temperature range of -40 to 85^°C.