Patent ID: 9621151
Date: 2017-04-11
CPC Classifications: H01L,H03K

Claim:
1. A semiconductor device that includes a floating terminal to be coupled to a floating voltage source, a termination area having a ring-like shape, a first area that is provided outside the termination area and that a circuit configured to operate at a first power supply voltage on the basis of a reference voltage is formed, a second area that is provided inside the termination area and that a circuit configured to operate at a second power supply voltage on the basis of the floating voltage is formed and that is configured by one semiconductor chip, comprising: a low side driver that is formed in the first area and drives a low side transistor that is provided outside the semiconductor device; a high side driver that is formed in the second area and drives a high side transistor that is provided outside the semiconductor device; a level shift circuit that converts a signal that has been generated in the first area and is based on the reference voltage into a signal that is based on the floating voltage and outputs the signal so converted to the second area; s first transistor that is formed in the termination area, is arranged between the floating terminal and a first sense node, and is driven at the first power supply voltage; and a fault detection circuit that is formed in the first area and detects presence of a fault when a voltage of the first sense node is higher than a first decision voltage that has been determined in advance in a period of time that the low side driver is driving the low side transistor into an ON state.