IR Intros IRF6621/IRF6612 DirectFET MOSFET Chip Set

International Rectifier Corp. (IR, El Segundo, CA) introduced its new IRF6621/IRF6612 synchronous buck converter chip set, which is designed for 14 A to 18 A per phase dc-dc power conversion in advanced notebook computer designs using the latest Intel® and AMD processors The new 30 V DirectFET™ MOSFET synchronous buck converter chip set consists of the IRF6621 control MOSFET and the IRF6612 synchronous MOSFET, with each device tailored to maximize performance in its role within a synchronous dc-dc buck converter circuit. The new chip set achieves above 87% efficiency at 18 A per phase and exceeds 90% efficiency at a mid-current level of 10 A per phase.

The IRF6621, with a low Qg and Qgd of only 11 nC and 3.8 nC, respectively, is suitable as a control FET. The IRF6621 shows a 15% reduction in on resistance-gate charge (108 mΩ-nC) compared to the previous 30 V device (IRF6608, 128 mΩ-nC). The IRF6621 is housed in a small can DirectFET package, about 38% smaller than an industry-standard SO-8. With a low typical 4.5 V device on-resistance of 3.4 mΩ, the IRF6612 is suited as a synchronous FET in moderate current applications (14 A to18 A per power channel). The IRF6612 is packaged in a medium can DirectFET package, enabling an easy design path to other DirectFET family members such as the IRF6611, IRF6678 or IRF6635 in higher current applications.

The IRF6621 and IRF6612 DirectFET™ MOSFETs are now available. Pricing is $0.76 each for the IRF6621 and $1.03 each for the IRF6612, both in 10,000-unit quantities.