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INTEGRATED MONOLITHIC SCHOTTKY AND AVALANCHE POWER RECTIFIER

IP.com Disclosure Number: IPCOM000009627D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-05
Document File: 2 page(s) / 198K

Publishing Venue

Motorola

Related People

Jon Choy: AUTHOR [+3]

Abstract

Some power applications, like over voltage and surge protection, require the use of both a forward diode to block reverse voltages and an avalanche diode to bypass system energy surges.

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0 M MOTOROLA Technical Developments

INTEGRATED MONOLITHIC SCHOTTKY AND AVALANCHE POWER RECTIFIER

by Jon Choy, Dave Chrudimsky and Thomas Jew

BACKGROUND

  Some power applications, like over voltage and surge protection, require the use of both a forward diode to block reverse voltages and an avalanche diode to bypass system energy surges.

Ground

6

PROBLEM

  Because of the differing functions and technolo- gies required by these two power devices, two sepa- rate discrete devices are required. This discrete solution consists of two components, additional board space and dual inventory. The forward diode should feature low forward voltage characteristics for low line loss. The avalanche diode should have high reverse current capability for system surge pro- tection.

SOLUTION

  Design and develop an integrated monolithic device having both the low forward voltage charac- teristics of Schottky technology and the high avalanche current capability of PN junction technol- ogy. A semiconductor device consisting of a high current Avalanche rectifier and a Schottky rectifier integrated on one monolithic chip.

Avalanche Schottky

  This dual device semiconductor is fabricated using two (2) n-type Epi layers grown on an n+ type silicon substrate. The 1st (lower) Epi layer has a higher dopant concentration than the 2nd (upper) Epi layer. On one side of the dual monolithic device is a Schottky Rectifier structure consisting of a Schottky metal barrier formed on the top surface of the 2nd Epi layer. Adjacent to the Schottky struc- ture, an...