Patent ID: 11876093
Assignee: RICHTEK TECHNOLOGY CORPORATION
Field: Semiconductors (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. The manufacturing method of the power device of claim 10, wherein a method for forming the LIGBT includes:
forming a second N-type region in the epitaxial layer;
forming a second P-type well in the epitaxial layer;
forming an N-type drain in the second P-type well;
forming a P-type contact electrode in the second P-type well, wherein the P-type contact electrode serves as an electrical point of the second P-type well;
forming a second gate on the epitaxial layer, wherein a part of the second gate is connected on the second P-type well;
forming a second N-type extension region in the second N-type region, wherein the second N-type extension region and the second P-type well are separated from each other via the second N-type region;
forming a P-type emitter in the second N-type extension region; and
forming a second field oxide region on the epitaxial layer, wherein the second field oxide region is located between the emitter and the drain.