Patent ID: 9196681
Filing Date: 2015-11-24
Classification: H01L

Abstract:
1. A laterally diffused metal oxide semiconductor field effect transistor (LDMOSFET) comprising: a first source contact region, a first gate contact region, and a drain contact region; an n-type buried layer; a first p-type body region formed in an n-type epitaxial layer, the first p-type body region directly contacting the first source contact region and extending past a first end of the first source contact region toward the drain contact region; a first p-type reduced surface field (PRSF) region formed in the n-type epitaxial layer, the first PRSF region disposed between the first p-type body region and the n-type buried layer; an n-type drain drift region formed in the n-type epitaxial layer, the n-type drain drift region directly contacting the drain contact region; a first n-type drift region formed in the n-type epitaxial layer, the first n-type drift region directly contacting a first portion of the n-type drain drift region, wherein the first PRSF region is further disposed between the first n-type drift region and the n-type buried layer; a second source contact region and a second gate contact region; a second p-type body region formed in the n-type epitaxial layer, the second p-type body region directly contacting the second source contact region and extending past a second end of the second source contact region toward the drain contact region; a second PRSF region formed in the n-type epitaxial layer, the second PRSF region disposed between the second p-type body region and the n-type buried layer; a second n-type drift region formed in the n-type epitaxial layer, the second s-type drift region directly contacting a second portion of the n-type drain drift region, wherein the second PRSF region is further disposed between the second n-type drift region and the n-type buried layer; and an n-type diffusion region in the n-type epitaxial layer, the n-type diffusion region electrically connecting the n-type buried layer with the first n-type drift region, the second n-type drift region, and the n-type drain drift region between the first and second PRSF regions.