An integrated circuit is provided, including an AD converter; a DC-DC converter converting a received first voltage into a second voltage and providing the second voltage as a power supply voltage of the AD converter; a control part controlling the AD converter and the DC-DC converter. The DC-DC converter includes a first switching element; a second switching element having one end coupled to a reference potential and the other end coupled to one end of the first switching element; a coil coupled to a connection point of the two switching elements; and a current detection part detecting a current flowing to the coil. The control part turns off the first switching element and turns on the second switching element, and after the current detected by the current detection part becomes equal to or smaller than a reference current value, turn off the second switching element to operate the AD converter.