Ignition device with single chip for internal combustion engine

There is provided a single chip igniter such that it is possible to realize a reduction in operating voltage, an increase in noise tolerance, a reduction in size, and a reduction in cost. By reducing the gate threshold voltage of a MOS transistor 1, and reducing the operating voltages of a current limiter circuit 7, an overheat detector circuit 10, a timer circuit, an overvoltage protection circuit, an input hysteresis circuit, and the like, it is possible to reduce the operating voltage of a single chip igniter 100. The effective gate voltage of the MOS transistor 1 is 1V or more, and the channel length of the MOS transistor 1 is 4µm or less. Also, the thickness of a gate oxide film 34 of the MOS transistor 1 is 5nm or more, 25nm or less.