Design of Charge Pump Circuit for Stepper Motor Drive Chip

Abstract

Abstract A charge pump circuit structure that can be applied to high-voltage drive circuits such as motor driver chips is proposed. The pump mode of the traditional circuit is changed based on the traditional charge pump, the output frequency of the oscillator is increased, and the capacitance area of the pump is reduced. The design and simulation of the proposed charge pump circuit are carried out based on HHG 0.35 um BCD technology. The simulation results show that when the simulation temperature is 27 °C and the clock cycle is set to 1 us, the voltageVin+5V can be stably output after 923 us, and the on-load current can reach 0.2 mA. The results meet the design requirements and provide a new way to solve this kind of problem.