P-channel power MOSFET enables simplified DC/DC converters
10 March 2004Power Electronics / Power Management
News & Events
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Siliconix, a subsidiary of Vishay Intertechnology has introduced the industry's first p-channel power MOSFET optimised for use in synchronous buck converters.
Used on the synchronous buck high-side, a p-channel MOSFET can be turned on with a gate drive that is lower than the battery voltage. This eliminates the need for extra bootstrap circuitry, simplifying and shrinking DC-DC converter designs. The Si3867DV takes this space-saving p-channel benefit a step further by optimising the device for low switching losses, ensuring efficient operation at high frequencies.
Combining on-resistance of 0,051 Ω with an extremely low typical gate charge of 7 nC, the Si3867DV delivers an on-resistance-times-gate-charge figure of merit (FOM) of 0,36. In addition, it has been optimised with a low Qgd/Qgs ratio of 0,7 to eliminate secondary turn-on effects.
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