Patent ID: 8278683

Claim:
A lateral insulated gate bipolar transistor (L-IGBT), comprising: a well of a first conductivity type; a set of sinks of a second conductivity type formed in a source area in said well on one side of a drain area in said well; a first metal oxide semiconductor (MOS) gate formed over a region of said well between a first member of said set of sinks and a second member of said set of sinks, wherein said first MOS gate extends over a portion of said first member of said set of sinks and a portion of said second member of said set of sinks; a second MOS gate formed over a region of said well adjacent to second member of said set of sinks, wherein said second MOS gate extends over a portion of said second member of said set of sinks; a first MOS source region of said first conductivity type formed in said first member of said set of sinks adjacent to said first MOS gate; a second MOS source region of said first conductivity type formed in said second member of said set of sinks adjacent to said first MOS gate; a third MOS source region of said first conductivity type formed in said second member of said set of sinks adjacent to said second MOS gate; and a buffer region of said first conductivity type formed in said source area and surrounding said set of sinks, in which a doping density of said buffer region is higher than a doping density of said well.