Patent ID: 11862675
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 14:
15. An integrated circuit (IC) comprising:
a substrate;
a termination device well having a first doping type in the substrate;
a switching device bordering the termination device well in the substrate;
a high side well overlying the termination device well in the substrate and having a second doping type opposite the first doping type;
a contact region overlying the high side well in the substrate and having the second doping type, wherein the contact region extends in a closed path along a sidewall boundary of the high side well and is localized to a periphery of the high side well; and
a peripheral well having the second doping type in the substrate, and separating and individually surrounding the switching device and the termination device well, wherein the peripheral well has a protrusion buried in the termination device well, wherein the protrusion has a first segment and a second segment protruding towards each other respectively on opposite sides of the high side well, and wherein the first and second segments are separated from the contact region by substantially the same distance.