Voltage-clamped power accumulation-mode MOSFET

Active solid-state devices (e.g. – transistors – solid-state diode – Field effect device – Having insulated electrode

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257339, 257342, 257368, 257403, H10L 21336, H10L 2706, H10L 2978

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active

058566929

ABSTRACT:
An accumulation-mode power MOSFET includes a trenched gate that is formed in a semiconductor material of a first conductivity type. A region of second conductivity type is formed in the substrate (which may include an epitaxial layer) and a PN junction formed by the region of second conductivity type is connected in parallel with the current path through the accumulation-mode MOSFET. The diode is designed to have a breakdown voltage was causes the diode to break down before the oxide layer surrounding the gate can be ruptured or otherwise damaged when the MOSFET is in an off condition.

REFERENCES:
patent: 4903189 (1990-02-01), Ngo et al.
patent: 5430315 (1995-07-01), Rumennik
B.J. Baliga et al., "The Accumulation-Mode Field-Effect Transistor: A New Ultralow On-Resistance MOSFET", IEEE Electron Device Letters, vol. 13, No. 8, Aug. 1992, pp. 427-429.
T. Syau, "Comparison of Ultralow Specific On-Resistance UMOSFET Structures: The ACCUFET, EXTEET, INVFET, and Conventional UMOSFET's", IEEE Transactions on Electron Devices, vol. 41, No. 5, May 1994, pp. 800-808.

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