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MOSFET and Schottky Devices

Fri, 04/06/2001 - 5:21am
Three new LITTLE FOOT Plus™ devices, each of which combines a low-side synchronous MOSFET, a high-side control MOSFET, and a Schottky diode in a single SO-8 package, were released today by Siliconix incorporated, an 80.4%-owned subsidiary of Vishay Intertechnology, Inc. The new Si4830DY, Si4808DY, and Si4834DY will significantly reduce space requirements for 2- to 5-A logic voltage dc-to-dc converters, providing improved power density and allowing designers to replace three discrete devices with a single integrated solution.

Optimized for synchronous buck converters with a switching frequency of up to 300 kHz, the three devices released today combine a 30-V breakdown voltage with power MOSFET on-resistance of 22 Ω per channel at a 10-V gate drive. Each MOSFET can handle up to 7.5 A of current. Maximum forward voltage for the Schottky diode component is 0.5 V at 1 A. Source and gate pins reduce control loop inductance for improved gate drive.

Each device provides a different pin-out variation to suit a variety of design approaches. The Si4808DY provides a dual pin-out with the Schottky diode in the lower position, while the Si4834DY provides a dual-pin out with the Schottky diode in the upper position. In the Si4830DY, the upper MOSFET and the Schottky are connected internally, eliminating the need for an external connection on the pc board.

Typical end products for the new devices will include notebook computers, game stations, and other space-sensitive information appliances.

The new LITTLE FOOT Plus devices simplify the designer's task by componentizing a 1-V buck dc-to-dc converter. In addition to saving space and reducing component count, by reducing three packages to one Siliconix has eliminated the inter-package parasitics associated with discrete solutions.

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