NEW LITTLE FOOT POWER MOSFETS TARGET CORE VOLTAGE DC/DC CONVERTERS
08 December 2000 - Vishay Electronic

A pair of new LITTLE FOOT power MOSFETs aimed at core voltage dc-to-dc converters in high-performance notebook computers was released today by Siliconix, an 80.4%-owned subsidiary of Vishay Intertechnology, Inc. Individually optimized for the switching and synchronous rectification functions performed by power MOSFETs in these circuits, the new devices will allow designers to improve the efficiency of notebook power conversion designs.

As the upper, switching MOSFET in a dc-to-dc converter, the new Si4894DY combines a high maximum drain current with reduced switching losses, accommodating the current demands of advanced microprocessors while reducing the possibility of over temperature conditions. With a 30-V breakdown voltage, the Si4894DY combines a maximum on-resistance rating of 12 mΩ at a 10-V gate drive, with current handling of 12.5 A. A low typical gate charge of just 20 nC typical further boosts efficiency.

As the bottom freewheeling MOSFET in the dc-to-dc circuit, which carries the current for the majority of the time, the new Si4404DY offers on-resistance of just 4 mW at a 10-V gate drive - approximately half the level of the previous-generation Si4874DY. The Si4404DY handles up to 23 A, with typical gate charge of 36 nC.

"Notebook computers utilizing Pentium III and other high-performance processors require power conversion circuitry that can handle faster speeds and higher currents," said Matthew Carter, Product Manager at Vishay Siliconix. "The Si4894DY and Si4404DY are an ideal solution for these applications, providing reduced switching losses in the upper slot, and low on-resistance in the lower slot."

Packaged in the LITTLE FOOT SO-8, samples and production quantities of the Si4894DY and Si4404DY are available now, with lead times of 8 to 10 weeks for larger orders.

http://www.vishay.com

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