The miniaturization of the driving circuit of ultrasonic motor is becoming more and more important in the ultrasonic application system. Based on the 0.35 μm bipolarcomplementary metal oxide semiconductordouble diffused metal oxide semiconductor(BCD) process, a monolithic integrated ultrasonic motor driving circuit chip is designed in this work. The chip consists of a nonsynchronous peak current mode boost circuit and two halfbridge drivers. The peak current mode boost circuit provides power for the halfbridge driver. Two square waves with the phase difference of 90° which output from two halfbridge drivers with adaptive deadtime controller are used to drive the ultrasonic motor.