Patent ID: 9263564
Filing Date: 2016-02-16
CPC Classification: H01L

Claim Text:
1. A power integrated circuit (IC) device comprising: a substrate of a first conductivity type; a lateral high-voltage field-effect transistor (HVFET) which includes a first drain region disposed in a first well region of a second conductivity type opposite to the first conductivity type, a first source region disposed in a first body region of the first conductivity type, a first insulated gate that laterally extends from over the first well region to over the first body region adjacent the first drain region, and a first source electrode electrically connected to the first source region; a sense FET laterally spaced-apart from the lateral HVFET by a first distance, the sense FET including a second drain region disposed in a second well region of the second conductivity type, a second source region disposed in a second body region of the first conductivity type, a second insulated gate that laterally extends from over the second well region to over the second body region adjacent the second drain region, and a second source electrode electrically connected to the second source region; a third well region of the second conductivity type disposed in an area of the substrate between the first and second body regions, the third well region being laterally separated from the second body region by a second distance, a sense resistor being formed between first and second contact regions laterally spaced-apart by a third distance in the third well region, the first source electrode being electrically connected to the first contact region and the second source electrode being electrically connected to the second contact region, wherein when the lateral HVFET and the sense FET are in an on-state, a voltage potential is produced at the second source electrode that is proportional to a first current flowing through the lateral HVFET.