Patent ID: 7009269

Claim:
A semiconductor device, comprising: an input terminal, a reference terminal and an output terminal; a switching element formed on a semiconductor substrate, whose one electrode is connected to said output terminal and whose other electrode is connected to said reference terminal; a control circuit providing a control signal for a control electrode of said switching element based on an input voltage obtained by said input terminal to control a conduction/non-conduction of said switching element; and a resistance part formed on said semiconductor substrate and interposed between said input terminal and said reference terminal, an input impedance of said input terminal being defined by said resistance part, wherein said resistance part includes a first resistance having a first temperature dependence; and a second resistance connected in parallel with or in series to said first resistance and having a second temperature dependence, said input impedance being defined by a combined resistance by said first and said second resistances and said first and said second temperature dependences are in an opposite relation to each other in a change of a resistance value according to a temperature change.