Patent ID: 7492133

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