The application range of the power management chip is very wide. Development of the power management chip is of great significance for improving the overall performance, and is directly related to the selection of this kind of chip and the demand of the system. The charge pump circuit through charge-transfer work achieves a certain boost in the case of no inductive components. Therefore, the boosted circuit and the power management chips are very popular in real applications. The low-power consumption charge pump DC/DC boost circuit analyzed in this paper is the result of a cooperation project with a foreign company. The circuit uses 0.35 μm standard CMOS process, and its input voltage is 2.5 V~5.0 V. When the input voltage is higher or lower than the output voltage, the output voltage maintains a stable low ripple output, and can work in step-up or step-down mode automatically. The charge pump circuit uses a comparative booster circuit and effectively reduces chip power consumption, and improves the conversion efficiency of the system, especially in the case of light load. The circuit has multiple protection features such as soft start, over-temperature protection and over-current protection. The simulation results satisfy the design requirements. This work is a valuable attempt to combine theory and practice.