The invention provides a motor driving integrated circuit for restraining power-consumption increasing and terminal amount increasing. The motor driving integrated circuit includes: a data input terminal; a data receiving circuit configured to receive a data signal inputted from the data signal input terminal; a control circuit configured to control the motor driving integrated circuit based on afirst data received through the data signal receiving circuit; and a pulse generating circuit configured to generate a pulse signal for PWM (Pulse Width Modulation)-controlling a motor coil based on a second data signal received through the data signal receiving circuit, the pulse generating circuit including: a rectangular signal generating circuit configured to generate a plurality of rectangular signals different in pulse width; and a synthesizing circuit configured to synthesize the plurality of rectangular signals outputted from the rectangular signal generating circuit to generate the pulse signal with a duty ratio corresponding to the second data signal.