Patent ID: 7956422

Claim:
A semiconductor device comprising: a trench metal oxide semiconductor (MOS) transistor adapted to provide a current load from a power source; and a boost controller adapted or configured to control the trench MOS transistor, the boost controller being a single semiconductor device with the trench MOS transistor to form an integrated structure, wherein the boost controller comprises: a lightly-doped P type epitaxial layer on the semiconductor substrate; an N type well and a first P type well having a predetermined depth in the P type epitaxial layer; an oxide film on each of the N type well and the P type well; P and N type polysilicon gates on the oxide film, respectively; P type source and drain electrodes in regions at opposite sides of the gate in the N type well; N type source and drain electrodes in regions at opposite sides of the gate in the P type well; a common drain on a back surface of the heavily-doped N+ type semiconductor substrate; and a device isolation layer adapted or configured to isolate the boost controller from the trench MOS transistor.