Integration of Trench Power Transistors into a 1.5 um BCD Process

Terry Dyer (Inventor), Jim McGinty (Inventor), Andrew Strachan (Inventor), Constantin Bulucea (Inventor)

Research output: Patent


The formation of vertical trench DMOS devices can be added to existing integrated BCD process flows in order to improve the efficiency of the BCD devices. The formation of this trench DMOS varies from existing approaches used with discrete trench DMOS devices, in that only two extra mask steps are added to the existing BCD process, instead of the 10 or so mask steps used in existing discrete trench DMOS processes. Further, the location of these additional heat cycles in the BCD process steps can be placed so as to have minimal impact on the other components created in the process. Utilizing an integrated trench device in a BCD process can offer at least a factor-of-two R<SUB>DS(ON) </SUB>area advantage over a planar counterpart.
Original languageEnglish
Patent numberUS 7067879 B1
Priority date28/05/04
Publication statusPublished - 27 Jun 2006


  • CMOS transistor
  • DMOS transistor
  • verticle trench DMOS device


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