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New charge pump eliminates need for inductor

Posted: 27 Dec 2004 ?? ?Print Version ?Bookmark and Share

Keywords:advanced analogic technologies? analogictech? aat3119? charge pump?

Designed for battery-powered portable applications, the new fixed frequency, high efficiency charge pump from Advanced Analogic Technologies Inc. (AnalogicTech) can be used with ultra-small 1?F capacitors at VIN and VOUT.

Representing the company's next generation of regulated voltage doublers, the new AAT3119 produces current levels up to 150mA and delivers 300mA of pulsed current. According to the press release, this new product eliminates the need for an inductor and requires only three small external capacitors.

Operating from a 2.7V to 5.5V input range, the AAT3119 is suitable for RGB and white LED backlighting applications in cellular phones, MP3 players, PDAs and other hand-held devices. It is housed in an 8-pin SC70JW package, conserving board space.

"The AAT3119 delivers a fixed switching frequency that does not change with output current," shared Erik Ogren, Product Marketing Manager for AnalogicTech. "This is a very important design consideration for noise-sensitive wireless applications like cellphones, where pinpointing a specific switching frequency simplifies the system design."

The new charge pump offers higher operating frequencies and lower output ripple than its predecessors, added AnalogicTech. A thermal management system protects the chip during any short-circuit condition at the output pin by sensing die temperature and shutting down the device. In addition, integrated soft-start circuitry prevents excessive in-rush current during startup. A low current shutdown feature reduces quiescent current to

Rated over the -40C to 85C industrial temperature range, samples and production quantities of the AAT3119 are already available. Parts are offered in a compact 8-pin SC70JW package and are priced at $1.26 (based on 1,000-unit quantities).

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