International Rectifier Corp. (IR, El Segundo, CA) introduced the IRF6608 control and synchronous MOSFET chip set for existing- and next-generation VRM10.x high-current synchronous buck converters. The IRF6608 has 8.5mOhms of typical on-resistance, while the IRF6618 synchronous MOSFET has 1.7mOhms of typical on-resistance. The new devices are housed in the DirectFET™ package.
The IRF6608 claims to be 50% smaller than the standard SO-8 package, and is the first HEXFET® MOSFET housed in the new double-side-cooled, surface-mount, DirectFET "S" package. The profile is 0.7mm. The IRF6618 has a typical on-resistance of 1.7mOhms and a maximum of 2.2mOhms, and is suitable for the synchronous MOSFET application, where low conduction loss is most important. The IRF6618 can also be used for secondary-side, synchronous rectification in high-current, isolated, dc/dc converters.
The new DirectFET MOSFETs are available immediately. Pricing for the IRF6608 is $1.03 each while the IRF6618 is $1.52 each in 10,000-unit quantities.
