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IR chipset suits notebook computers with Intel, AMD processors

Posted: 12 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:international rectifier? ir? irf6621? irf6612? synchronous buck converter chipset?

International Rectifier (IR) unveiled its IRF6621/IRF6612 synchronous buck converter chipset that is optimized for 14A to 18A per phase dc-dc power conversion in advanced notebook computer designs using the latest Intel and AMD processors.

The new 30V DirectFET MOSFET synchronous buck converter chipset consists of the IRF6621 control MOSFET and the IRF6612 synchronous MOSFET, with each device tailored to maximize performance in their role within a synchronous dc-dc buck converter circuit, said the press release. The new chipset achieves above 87 percent efficiency at 18A per phase and exceeds 90 percent efficiency at a mid-current level of 10A per phase.

"The board space savings alone of two DirectFET MOSFETs versus three SO-8 devices is almost 50 percent," said Jeff Sherman, Senior Marketing Manager for IR's Portable Computing Solutions. "This new chipset is an excellent value for customers seeking very compact and efficient switching in mid-range, 14A to 18A power converter applications."

The IRF6621, with its low Qg and Qgd of 11nC and 3.8nC respectively, is best suited as a control FET. This device shows a 15 percent reduction in on resistance-gate charge (108 milliohm-nC) compared to the previous 30VN device (IRF6608, 128 milliohm-nC). The IRF6621 is housed in a small can (SQ) DirectFET package, which is about 38 percent smaller than an industry-standard SO-8.

With a low typical 4.5V RDS(on) of 3.4 milliohms, the IRF6612 is designed as a synchronous FET in moderate current applications (14A to18A per power channel). It is packaged in a medium can (MX) DirectFET, enabling an easy design path to other DirectFET family members such as the IRF6611, IRF6678 or IRF6635 in higher current applications or applications where better thermal performance is desired.

Both the IRF6612 and IRF6621 DirectFET MOSFETs are available immediately. Pricing is $1.03 each for the IRF6612 and 76 cents each for the IRF6621, both in 10,000-unit quantities. Prices are subject to change.

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