MOSFET range extended
01 September 2006
International Rectifier (www.irf.com) has announced two MOSFET designs which extend its DirectFET and HEXFET ranges. Both can be used in computing applications, the HEXFET MOSFET can be used in servers, laptop adapters and desktop power supplies, while the DirectFET 30V synchronous buck converter
chipset can be used in notebook and desktop computers in datacomms and telecomms.
The synchronous buck converter chipset is made up of the IRF6631 Control MOSFET and IRF6638 Synchronous MOSFET in DirectFET packaging. The IRF6631 control MOSFET reduces switching losses and the IRF6638 synchronous MOSFET reduces conduction losses and reverse-recovery charge. The packaging has double-sided cooling.
The chipset is described as a compact and efficient switching solution for 15 to 18A power converter applications. It improves efficiency by over one per cent in the five to 8A range and saves board space by almost 50 per cent, compared to the typical approaches used by three SO-8 devices, according to the company. The IRF6631 reduces on-resistance-gate charge to 99.6mÙnC. The IRF6638 delivers a typical on-state resistance of 3mÙ at 4.5V, which is a 12 per cent reduction, claims the company, with the same gate charge.
The 60 and 75V IFRB/S/SL3206, 3306, 3207Z and 3307Z HEXFET MOSFETs, used in AD/DC converters and low voltage motor drives as well as for AC/DC synchronous rectification lower RDS(ON) by up to 10 per cent over the previous industry standards. Maximum RDS(ON) for the 75V devices is from 4.1mÙ to 5.8mÙ and three to 4.2mÙ for 60V devices. T0-220, D2PAK and TO-262 package styles are available, to industrial grade and moisture sensitivity level 1 (MSL1).
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