MOSFET chip set cuts footprint in half

A 30V synchronous buck converter chip set—the IRF6631 Control MOSFET and IRF6638 Synchronous MOSFET—is claimed to offer a board space savings of almost 50% compared to other approaches using three SO-8 devices. Developed by International
Aug. 23, 2006

A 30V synchronous buck converter chip set—the IRF6631 Control MOSFET and IRF6638 Synchronous MOSFET—is claimed to offer a board space savings of almost 50% compared to other approaches using three SO-8 devices. Developed by International Rectifier, the chip set integrates the company's DirectFET packaging with double-sided cooling and the latest Hexfet MOSFET technology.

In addition to saving space, the chips improve efficiency by over 1% in the 5A to 8A range, says IR.

The IRF6631 DirectFET Control MOSFET reduces switching losses, while the IRF6638 DirectFET synchronous MOSFET lessens conduction losses and reverse-recovery charge.

The IRF6631 features a gate charge of 12nC and delivers a 16% reduction in figure of merit of on-resistance gate charge (99.6 mΩnC); the IRF6638 Synchronous FET delivers a typical on-state resistance of 3.0mΩ at 4.5V.

About the Author

Sign up for Electronic Design Newsletters
Get the latest news and updates.

Voice Your Opinion!

To join the conversation, and become an exclusive member of Electronic Design, create an account today!