DMOS power transistors with reduced number of contacts using integrated body-source connections
First Claim
1. A closed DMOS field effect transistor cell formed in a semiconductor substrate, having a gate region, a source region, a drain region, and a body region, said DMOS field effect transistor cell having a portion exposed at a surface of said semiconductor substrate, wherein said exposed portion has the topology of an elongated hexagon.
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Abstract
Two topologically different cells are disclosed that reduce the total number of contacts per device and that are applicable to mid- to high-voltage DMOS transistors. These cells use integrated connections between the source and the body that make them less sensitive to contact obturations by particle contamination or lithography imperfections. The topologies include either an elongated hexagonal cell or a buried-deep-body cell. Both cells are most efficient in high-current medium-voltage trench DMOS transistors, where the density of body contacts becomes prohibitive while the perimeter/area geometry factor is less critical. The disclosed embodiments are of the trench type of DMOS construction. The cells may, however, be implemented in planar DMOS transistors as well.
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Citations
9 Claims
- 1. A closed DMOS field effect transistor cell formed in a semiconductor substrate, having a gate region, a source region, a drain region, and a body region, said DMOS field effect transistor cell having a portion exposed at a surface of said semiconductor substrate, wherein said exposed portion has the topology of an elongated hexagon.
Specification