Patent ID: 7504690
Filing Date: 2009-03-17
Classification: H01L,H02M,H03K,Y02B

Abstract:
1. An insulated gate power transistor semiconductor device comprising a semiconductor body having an active area with a plurality of electrically parallel transistor cells, wherein each transistor cell has a source region and a drain region of a first conductivity type which are separated by a channel-accommodating body region adjacent an insulated gate structure, said gate structure comprising first and second gates isolated from each other so as to be independently operable, the first gate being an insulated trench-gate adjacent the body region enabling a first, vertical, channel portion to be formed in said body region when gate potential is applied to the first gate, the second gate having at least an insulated planar gate portion that is located above the first gate on a top major surface of the semiconductor body adjacent the body region, the second gate enabling a second, at least partly lateral, channel portion to be formed in said body portion when gate potential is applied to the second gate, such that simultaneous operation of the first and second gates combines the first and second channel portions to form a conduction channel between the source and drain regions.