Patent ID: 6696707
Filing Date: 2004-02-24
Classification: H01L

Abstract:
A high voltage integrated switching device comprising:a dielectrically isolated, bonded and vertically trenched silicon substrate; at least one high voltage switching circuit fabricated on the substrate, and including an active region having a single conductivity-type layer having a depth; at least one intermediate voltage circuit fabricated on the substrate; and at least one low voltage circuit fabricated on the substrate; wherein the high voltage switching circuit is characterized by a breakdown voltage of at least 100 volts, the intermediate voltage circuit is characterized by a breakdown voltage of up to approximately 100 volts, and the low voltage circuit is characterized by a breakdown voltage of up to approximately 20 volts; wherein the breakdown voltage of said high voltage switching circuit is relative to said depth of said layer of said active region of said high voltage switching circuit, such that an increase in said depth of said layer of said active region results in an increase in said breakdown voltage of said high voltage switching circuit; wherein said high voltage switching circuit is constructed such that, in operation, current flows through said active region substantially perpendicular to a top surface of said silicon substrate; wherein said high voltage switching circuit includes a conductive wraparound layer which substantially encompasses all but an upper surface of said active region; and wherein said current flows from a source of said high voltage switching circuit through said active region to said wraparound layer to a drain of said high voltage switching circuit.