电源管理芯片的应用范围十分广泛，发展电源管理芯片对于提高整机性能具有重要意义，对电源管理芯片的选择与系统的需求直接相关。其中电荷泵电路通过电荷转移方式工作，来达到在无电感元件情况实现一定升压，因此该升压电路和该款电源管理芯片在应用中很受欢迎。该设计分析的低功耗电荷泵 DC/DC 升压电路是同国外某公司的合作项目。该电路采用0.35μm标准的CMOS工艺制成，输入电压在2.5 V～5.0 V，且输入电压高于或低于输出电压时，输出电压都可保持稳定的低纹波输出，并能自动工作于升压或降压模式。该电荷泵电路采用比较升压电路，有效的降低了芯片功耗，特别在轻负载情况下提高了系统的转换效率。电路还具有软启动、过热保护及过流保护等多重保护功能。仿真结果均达到预定指标，是设计理论与实践相结合的一次有价值的尝试。%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 0.35μm 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.
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