El Segundo, Calif.—International Rectifier's 30-volt synchronous buck converter chipset (IRF6631 control MOSFET and IRF6638 synchronous MOSFET) brings higher efficiency and thermal performance at intermediate current levels (below 18 amps) for higher density notebook and desktop computers and telecom and datacom equipment.
"This new DirectFET chipset is an excellent choice for designers seeking very compact and efficient switching in mid-range, 15- to 18-amp power converter applications. In addition to improving efficiency by over 1 percent in the five- to eight-amp range, the
board space savings is almost 50 percent compared to the typical approaches using three SO-8 devices," said Jeff Sherman, senior marketing manager for Portable Computing Solutions.
The IRF6631 control FET features a gate charge of 12 nC and delivers a 16 percent improvement in figure of merit (the product of on-resistance and gate charge) compared to previous company offerings, to 99.6 milliohm-nC. The IRF6638 synchronous FET delivers a typical on-state resistance of 3 milliohms at 4.5 volts, a 12 percent reduction over existing devices while maintaining the same gate charge. The chip pair features the company's DirectFET packaging with double-sided cooling.
Click here to access the IRF6631's datasheet (four versions), and here for the IRF6638's (two versions). The IRF6631 and IRF6638 DirectFET MOSFETs are available immediately. Pricing is $1.05 each for the IRF6631 and 65 cents each for the IRF6638, both in 10k-unit quantities. Prices are subject to change. The devices are RoHS compliant.
International Rectifier, 1-310-252-7105, www.irf.com