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Charge pump regulator enables the design of ultra-thin solutions

Posted: 15 Aug 2005 ?? ?Print Version ?Bookmark and Share

Keywords:advanced analogic technologies? analogictech? aat2820? charge pump regulator?

Advanced Analogic Technologies Inc. (AnalogicTech) released a triple-output charge pump regulator that can generate three regulated output voltages for turn-on gate drive bias (Vpos), turn-off gate voltage bias (Vneg) and logic voltage.

The new AAT2820 regulator is targeted for use in battery-powered portable devices. According to Erik Ogren, Product Marketing Manager at AnalogicTech, an increasing number of smartphones, PDAs and other portable devices now integrate CCD camera chips and TFT displays that need positive and negative low-current bias supplies.

"By providing two regulated output voltages up to 25V and -25V, and a third regulated output voltage for logicall without the use of an inductorthe AAT2820 offers battery-powered device designers an extremely compact, low-profile solution for power regulation," Ogren added.

Both V(on) and V(off) output voltages use external diode and capacitor multiplier stages to regulate output. By eliminating the use of high profile inductors, the AAT2820 supports the design of ultra-thin solutions that are 0.8mm high.

Operating at the 1MHz switching frequency, the new regulator allows designers to use small, low profile external capacitors. Integrated soft-start circuitry protects the device against excessive inrush current during startup. A low power shutdown feature disconnects the load from V(in) and reduces quiescent current to <0.1?A. A thermal protection circuit shuts down all the charge pumps if the die temperature rises above a preset internal thermal limit.

Specified over the -40C to 85C operating temperature range, the AAT2820 is available immediately in a Pb-free TDFN44-16 package. This product is priced at $1.53 in 1,000-piece quantities.

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