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

Claim 3:
4. The power device of claim 1, wherein each LIGBT includes:
a second N-type region, which is formed in the epitaxial layer;
a second P-type well, which is formed in the epitaxial layer;
an N-type drain, which is formed in the second P-type well;
a P-type contact electrode, which is formed in the second P-type well, wherein the P-type contact electrode serves as an electrical point of the second P-type well;
a second gate, which is formed on the epitaxial layer, wherein a part of the second gate is connected on the second P-type well;
a second N-type extension region, which is formed 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;
a P-type emitter, which is formed in the second N-type extension region; and
a second field oxide region, which is formed on the epitaxial layer, wherein the second field oxide region is located between the emitter and the drain.