Patent ID: 7294992

Claim:
A semiconductor device comprising: a high-side switching element provided on a high voltage side power source side, which switches on/off according to a signal inputted to a control electrode; a low-side switching element provided on a low voltage side power source side, which switches on/off according to a signal inputted to a control electrode; and a first off detection circuit having a first constant current source which generates a constant current, a first transistor with a first electrode connected to the control electrode of the low-side switching element and a second electrode connected to the first constant current source, which is switched on by a first voltage applied to the control electrode, and a first signal level detection section which detects a signal level of the control electrode of the low-side switching element, where the first constant current source and the first transistor discharge charges accumulated in the first signal level detection section when the low-side switching element switches from the on state to the off state.