Patent ID: 9722019
Date: 2017-08-01
CPC Classifications: H01L,H03K

Claim:
1. A high voltage integrated circuit device for use with a high voltage power supply to drive a high potential side power transistor that is connected in series with a low potential side power transistor, the high voltage integrated circuit device comprising: a second conductivity type high potential region formed in a surface layer or on the surface of a first conductivity type semiconductor layer; a second conductivity type voltage resistant region, formed in a surface layer or on the surface of the semiconductor layer, in contact with and enclosing the high potential region and having an impurity concentration lower than that of the high potential region; a first conductivity type common potential region in contact with and enclosing the voltage resistant region in a surface layer or on the surface of the semiconductor layer; a first conductivity type intermediate potential region formed inside the high potential region; a second conductivity type first high concentration region formed in a surface layer of the high potential region; a first conductivity type second high concentration region formed in a surface layer of the common potential region; a first pickup electrode in contact with the first high concentration region; and a second pickup electrode in contact with the second high concentration region, wherein the intermediate potential region is a circuit region formed inside the high potential region and to which is applied an intermediate potential between a high potential side potential of the high voltage power supply, which is the main circuit power supply of the high potential side and low potential side power transistors that are connected in series, and a common potential that is a low potential side potential of the high voltage power supply, wherein the high potential region is a region to which a high potential side potential of a low voltage power supply is applied with the intermediate potential as a reference, and wherein a high voltage junction terminal region is a region formed of the voltage resistant region, the common potential region, the first high concentration region, and the second high concentration region, and wherein the high voltage integrated circuit device further comprises a first conductivity type aperture portion that reaches the first conductivity type semiconductor layer from the surface of the high potential region, encloses the circuit region, and has a gap portion between opposite ends of the first conductivity type aperture portion, the first high concentration region being disposed in the voltage resistant region or high potential region between the common potential region in a location in which the gap portion is positioned and the circuit region, wherein the gap portion extends directly between the opposite ends of the first conductivity type aperture portion, is of the second conductivity type, and is part of the second conductivity type high potential region, and wherein the first high concentration region extends linearly along an entire length of the gap portion.