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ON Semiconductor buck controller fits low-voltage computing apps

Posted: 18 Apr 2002 ?? ?Print Version ?Bookmark and Share

Keywords:ncp1570? synchronous buck controller? ldo? voltage regulator ic? power supply controller?

Designed for use in dc/dc converters in computing and telecom boards, the NCP1570 8-pin synchronous buck controller from On Semiconductor provides a power supply for computing applications that require voltages down to 1V and current levels up to 15A.

The device can generate the 2.5V needed to power DDR memory for desktop PCs and graphic cards. It is also suited for powering graphics controllers, ASICs, DSPs, and can be used as a replacement for LDOs.

"The NCP1570 is a highly-integrated controller that requires only a few external components to create an efficient power supply," said Leslie Logan, ON Semiconductor marketing manager. "In addition to saving valuable board space and reducing the overall costs of implementing a power supply, this device delivers efficiencies well over 80 percent."

The controller features a PowerGood function with a programmable delay, enabling designers to monitor the status of the power supply. The company claims that the programmable delay ensures that the PowerGood will not trip if there is a slight, short spike in power.

PowerGood produces an output that is high when the output voltage is within the set limits, and goes low when it is outside the limits, thus allowing a controlled shutdown of the power supply.

The NCP1570 incorporates a fixed 200kHz internal oscillator that reduces external component count. A 0.985V reference voltage is utilized to generate an output voltage of 1V up to 3.3V from a 5V input.

The SO-8 device is based on a synchronous V2 architecture that delivers a typical transient response of 200ns to changes in load, and improved line and load regulation.

The NCP1570 is priced at 82 cents each in 10,000-unit quantities.

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