Patent ID: 8957475
Filing Date: 2015-02-17
Classification: H01L

Abstract:
1. A laterally diffused metal oxide semiconductor (LDMOS) device, comprising: a drain region of a bootstrap field effect transistor (FET); a source region of the bootstrap FET; a drift region between the drain region and the source region; a gate at one side of the source region and on the drift region; a first conductive type epitaxial layer on a second conductive type semiconductor substrate having a first P-TOP region between a second conductive type deep well and a first conductive type first well; and a field insulating layer on the first conductive type epitaxial layer; wherein the drain region comprises (i) a first conductive type first buried layer on the second conductive type semiconductor substrate, (ii) the first conductive type first well on the first conductive type first buried layer; and (iii) a high concentration first conductive type first connection region in the first conductive type first well, and the source region comprises (i) a second conductive type buried layer on the second conductive type semiconductor substrate, (ii) the second conductive type deep well on the second conductive type buried layer, (iii) a first conductive type second well and a second conductive type first well in the second conductive type deep well; and (iv) a high concentration first conductive type second connection region in the first conductive type second well.