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PMIC packs start-up sequence programmability

Posted: 12 Jan 2010 ?? ?Print Version ?Bookmark and Share

Keywords:power management IC? PMIC? programmable LDO?


From austriamicrosystems comes the AS3607, a highly-integrated power management IC (PMIC) that it claims features a level of start-up sequence programmability not found in competing devices.

Processor and memory power supplies must follow precise start-up sequences otherwise they can be seriously damaged. Therefore it is critical that the voltages are switched on and off in the correct order. Compared to a discrete solution consisting of a collection of standalone DC/DCs, LDOs and chargers, the AS3607 accomplishes this task with software programmable start-up sequences. Comparable PMICs are offered with fixed start-up sequences that are selected with external resistors.

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 easily be programmed enabling fast prototype runs for quick market introduction. The slope of the ramp can be set for the step-down converters. The user can program the start-up sequence with timing steps of 1ms 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 AS3607 fully programmable 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 powerful Li-Ion battery charger. The three step-down converters deliver 700mA each with an efficiency of up to 95 percent, extending battery life significantly. The fixed 2MHz switching frequency minimizes PCB footprint by allowing the use of tiny, low-profile inductors.

The AS3607 is suitable for portable navigation devices, portable media players, e-dictionaries, GPS devices, PDAs and a wide range of battery powered handheld devices using ARM-based processors.

It is available in a QFN36, 6mm x 6mm, 0.5mm pitch package and has an operating temperature range of -40 to +85C.

The AS3607 is available now for $2.99 at 1,000 quantities.

- Ismini Scouras
EE Times

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