12 V MOSFETs have 15% higher current capability

23 April 2003 Power Electronics / Power Management

International Rectifier has introduced four new 12 V HEXFET power MOSFETs optimised for low input voltage (typically 3,3 V and 5 V) point-of-load (POL) buck converters. These MOSFETs deliver up to 15% higher current handling capability when compared to industry standard 30 V devices, says IR. Typical applications include POL buck converters for telecom and datacom systems, desktop computers, servers and game consoles. The IRF7476/5, IRLR3802 and IRLU3802 N-channel MOSFETs and the IRF7910 dual N-channel MOSFET are optimised for low device on-resistance and low gate charge to minimise both conduction and switching losses. In low input voltage POL buck converters, the duty cycles of the synchronous and control MOSFETs are similar, usually higher than 30%. Therefore, the control and synchronous MOSFETs can have similar specs to minimise conduction and switching losses at the same time. For load current applications up to 6 A, separate control and synch MOSFETs can be replaced with a single IRF7910 dual MOSFET; for applications to 10 A, two IRF7476 or IRF7475 MOSFETs can be used, and for 12 A the IRLR3802 can be used.

Avnet Kopp, 011 809 6100

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