ICL7667 was used as a power MOSFET driver in stepper motor drive system in order to increase switching speed of the power MOSFET and to realize high-frequency chopping control for stepper motor.The gate capacitance and switching time of the power MOSFET were studied.The results show that the charge and discharge processes of gate capacitance affecte the switching speed of power MOSFET.So a method increasing the switching speed of the power MOSFET was introduced.Finally,ICL7667 was used as a power MOSFET driver to achieve a high-frequency chopping control for stepper motor.Simulation and test results indicate that the chopping frequency by using ICL7667 can reach up to 200 kHz when the power MOSFET is still in cut-off or deep saturation,which has increased by 10 times as compared with 20 kHz by using voltage division with resistor.In proposed system,stepper motor can run correctly under control of high-speed chopping signal.