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News

Siliconix's 7-nC P-channel MOSFET enables design of simplified

Vishay Electronic : 03 November, 2003  (New Product)
In a breakthrough that will help designers reduce the size of dc-to-dc converters in the smallest handheld electronic systems, Siliconix incorporated, an 80.4%-owned subsidiary of Vishay Intertechnology, Inc. today announced the industry's first p-channel power MOSFET optimized 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-to-dc converter designs.

The new Vishay Siliconix Si3867DV takes this space-saving p-channel benefit a step further by optimizing the device for low switching losses, ensuring efficient operation at high frequencies. Combining on-resistance of 0.051 ohms with an extraordinarily low typical gate charge of 7 nC, the Si3867DV delivers an on-resistance-times-gate-charge figure of merit of 0.36, which is 28% better than the next best competing p-channel MOSFET on the market.

In addition to this low FOM value, the Si3867DV has been optimized with a low Qgd/Qgs ratio of 0.7 to eliminate secondary turn-on effects.

Packaged in the LITTLE FOOT TSOP-6, the -20-V Si3867DV will be used for low-current buck and inverter dc-to-dc converters in end products including cell phones, SIP cards, PDAs, digital still and video cameras, and hard disk drives. Additional applications include notebook computer synchronous buck converters for auxiliary voltages and asynchronous buck converters for smart battery packs.

This is the first in a planned series of PWM-optimized p-channel MOSFETs. Future entries in the series will include devices with -12-V and -30-V breakdown voltages and optional on-board Schottky diode in a range of surface-mount LITTLE FOOT and PowerPAK packages.

Samples and production quantities of the Si3867DV are available now, with lead times of 8 to 10 weeks for larger orders.
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