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Buck regulator tailored for portable electronic apps

Posted: 10 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:sipex? sp6656? buck regulator?

Sipex Corp. unveiled a 400mA synchronous buck regulator with logic controlled output voltage selection. According to the company, the bit programmable output voltage of the SP6656 allows it to dynamically adjust to the changing power requirements of today's ASICs, DSPs and microprocessors used in portable electronic equipment.

"Using the SP6656, a designer can build a small, compact, low noise solution," said Kevin Plouse, SVP of marketing and business development at Sipex. "High efficiency over the entire load range improves both standby and operating time for portable equipment, increasing product value."

The device's proprietary control loop, 20?A light load quiescent current and integrated 0.3 ohm synchronous switches provide high efficiency (98 percent) across a wide range of output currents, increasing battery life. As the input battery supply decreases towards the output voltage, Sipex explained, the SP6656 uses a special control loop to seamlessly transition into 100 percent duty cycle mode with only 80?A quiescent current. The SP6656 can be shutdown using the ENABLE pin, reducing power drawn to nanoamps and enabling longer standby times in portable electronics. Other features include user programmable output voltage down to 1V, a built-in 625mA current limit and 140C over temperature shutdown. Input voltage range is from 2.7V to 5.5V.

Housed in a 2.4-by-2.5mm DFN package, the SP6656 is available in standard (SP6656ER/TR) and Pb-free (SP6656ER-L/TR) options, with pricing starting at $1.29 in 1,000-piece quantities. Samples and evaluation boards are also available.

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