EL SEGUNDO, Calif. - July 2005 - International Rectifier, IR® (NYSE: IRF), a world leader in power management technology, today introduced a new 20V DirectFET® MOSFET synchronous buck converter chip set. The IRF6610 and IRF6636 small can DirectFET MOSFET pair has performance similar to a pair of SO-8 MOSFETs with a 40% size reduction. The chip set is designed for high frequency, point-of-load (POL) designs where size, efficiency and thermal performance are critical design considerations.

"In 12V computing systems, the IRF6610 and IRF6636 chip set is ideal for high density , 15A POL converters that support output voltages from 5V to below 1V," said Faisal Ahmad, Marketing Manager for DC-DC Computing Products at International Rectifier. "For example, a 500kHz POL converter delivering 15A output current at 1.5V achieves greater than 88% efficiency with this chip set."

The IRF6610 features very low gate charge of 10nC, minimizing switching losses for an optimized control FET function. The IRF6636 is a versatile DirectFET power MOSFET with 4.5mOhm device on-resistance and a low gate charge of 18nC, and can be used as either a synchronous FET for 15A applications when coupled with an IRF6610, or a as a control FET when used with the IRF6691 for 35A per phase, multi-phase applications. The IRF6636/IRF6691 chip enables greater density in applications such as POL modules, replacing as many as four thermally enhanced SO-8 MOSFET devices.

Part Number	Package	BVDSS(V)	RDS(on) max @10V(mOhm)	RDS(on) max @4.5V(mOhm)	VGS(V)	ID @ Tc=25ºC(A)	QG typ(nC)	QGD typ(nC)
IRF6610	DirectFET SQ	20	8.0	10.0	20	50	10.0	2.0
IRF6636	DirectFET ST	20	4.5	6.4	20	55	18	6.1

Patented DirectFET® Packaging Technology

International Rectifier's patented DirectFET MOSFET packages present a whole new set of design advantages not previously delivered by standard plastic discrete packages. Their metal can construction enables dual-side cooling that effectively doubles the current handling capacity of high frequency DC-DC buck converters powering advanced microprocessors. In addition, devices in the DirectFET package are compliant with the Restriction of Hazardous Substances Directive (RoHS).

For more information related to DirectFET MOSFET Packaging Technology visit the DirectFET Home page.

Availability and Pricing

The new IRF6636 and IRF6610 DirectFET MOSFET synchronous buck chip set is available immediately. Pricing is US $0.88 each for the IRF6636 and US $0.70 each for the IRF6610, each in 10,000-unit quantities. Prices are subject to change.