Patent ID: 8222691

Claim:
A high-voltage transistor comprising: a pillar of semiconductor material arranged on a die in an annular layout having first and second substantially linear portions that extend in a first lateral direction and first and second rounded end portions that connect the first and second substantially linear portions at respective opposite ends of the annular layout, the pillar including a drift region that extends in a vertical direction through the die; first and second dielectric regions disposed on opposite sides of the pillar, the first dielectric region being laterally surrounded by the pillar, and the second dielectric region laterally surrounding the pillar; first and second field plates respectively disposed in the first and second dielectric regions; first and second gate members respectively disposed in the first and second dielectric regions on opposite sides of the first substantially linear portion of the pillar; third and fourth gate members respectively disposed in the first and second dielectric regions on opposite sides of the second substantially linear portion of the pillar; and wherein the first, second, third, and fourth gate members terminate at or near the first and second rounded end portions such that the first and second rounded end portions are devoid of gate members.