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Amplifiers/Converters??

Dc-dc switching converter with synchronous rectification

Posted: 18 Apr 2005 ?? ?Print Version ?Bookmark and Share

Keywords:On-Semi?

ON Semiconductor unveiled a monolithic, micro-power, high-frequency step-up dc-dc switching converter that boosts the voltage from one or two nickel metal-hydride (NiMH) or nickel cadmium (NiCd) cells up to a usable level of 1.8V or 3.3V.

The new NCP1423 integrates synchronous rectification to improve efficiency and to eliminate the external Schottky diode. Its high switching frequency (up to 600kHz) allows for a low profile, small-sized inductor and output capacitor to be used. When the device is disabled, the internal conduction path from the LX or BAT pin to the OUT pin is fully blocked, with the OUT pin isolated from the battery. This True-Cutoff function effectively reduces the shutdown current, said ON Semi, while a Ring-Killer feature has also been integrated to eliminate the high-frequency ringing in discontinuous conduction mode.

Target applications for the new product include battery-operated portable electronic products, supplying up to 400mA load, including wireless optical mice and keyboards, wireless headsets, audio players, PDAs and other hand-held devices.

Additional features such as a low-battery detector, cycle-by-cycle current limit and thermal shutdown provide other benefits for various battery-operated applications. With all these functions enabled, the quiescent supply current is typically 9?A, minimizing battery current drain.

The NCP1423DMR2 is available in a Micro-10 package and is priced at 95 cents per unit in 10,000-piece quantities.



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