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Siliconix MOSFETs reduce conduction losses

Posted: 12 Dec 2003 ?? ?Print Version ?Bookmark and Share

Keywords:mosfet? siliconix? si4336dy? si7336dp?

Compared with the SO-8 devices on the market, the Si4336DY (Little Foot SO-8) and Si7336DP (PowerPAK SO-8) from Siliconix Inc. offer a 13.5 percent better on-resistance-times-gate charge product of 83 mWnC. The ratio of gate-to-drain and gate-to-source charges has also been improved by 35.6 percent.

Used as the low-side MOSFET in computer synchronous buck converters or for fixed-telecom synchronous rectification or point-of-load converters, the products provide reduced switching and conduction losses, or higher current operation with the same efficiency, at frequencies up to 1MHz.

When paired with two WFET power MOSFET devices on the high side of a synchronous buck converter, two Si4336DY MOSFETs on the low side yield a 1 percent improvement in efficiency over the next-best competitive SO-8 pair. Both devices feature a typical rDS(on) of 2.6 milliohms and typical gate charge of 32 nC.

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