Patent ID: 6225664
Filing Date: 2001-05-01
Classification: H01L,H03K

Abstract:
An IC driver for driving a series circuit of an upper-side and a lower-side output power devices, the upper-side output power device having a first main electrode to be supplied with a first level power supply, a control electrode and a second main electrode, the lower-side output power device having a first main electrode connected to the second main electrode of the upper-side output power device via an intermediate potential terminal, a control electrode and a second main electrode to be supplied with a second level potential lower than the first level potential, one of the first and second level potentials is ground potential, the IC driver comprising:an internal power supply circuit electrically isolated from the ground potential;a semiconductor island of a first conductivity type;a dielectric film contacted with the semiconductor island at its bottom and side thereof;a switching device having a first main electrode region of a second conductivity type opposite to the first conductivity type, being supplied with an operating current from the internal power supply circuit, and a second main electrode region of the second conductivity type being electrically isolated from the ground potential, both disposed in the semiconductor island, the second main electrode region of the switching device supplies a control signal to the control electrode of one of the upper-side and lower-side output power devices which is electrically isolated from the ground potential so as to operate in a floating state; andan injector region of the second conductivity type for injecting a carrier so as to supply a displacement current flowing through a parasitic condenser associated with the dielectric film disposed at the bottom of the semiconductor island, disposed in said semiconductor island, at a position separated from said first and second main electrode regions of the switching device.