Patent ID: 7723975

Claim:
A current detection circuit comprising: a current detection current mirror circuit comprising an output current transistor which supplies an output current, and a current detection transistor which supplies a detection current proportional to the output current; a compensation current mirror circuit which is connected to a current supply side of the current detection current mirror circuit, so that a terminal voltage of the output current transistor and a terminal voltage of the current detection transistor have a predetermined relationship; and a current detector which indirectly detects the output current, by detecting the detection current wherein the current detection current mirror circuit further comprises an input current transistor for generating, in the output current transistor, the output current proportional to an input current from outside; and the current detection circuit further comprises an input current supply current mirror circuit comprising: a first input current supply transistor which receives the input current; a second input current supply transistor, connected to the input current transistor, which generates a current corresponding to the input current in the input current transistor; and a third input current supply transistor which supplies a bias current to the compensation current mirror circuit.