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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2.5V～5.0V,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 of the power management chip is very extensive. It is of great significance to develop the power management chip to improve the performance of the whole device. The choice of the power management chip is directly related to the system requirements. Among them, the charge pump circuit works by the charge transfer method to achieve a certain voltage boost in the case of an inductorless component. Therefore, the boost circuit and the power management chip are very popular in applications. The design analysis of low-power charge pump DC / DC boost circuit with a foreign company’s cooperation project. The circuit is made of 0.35μm standard CMOS technology, the input voltage of 2.5V ~ 5.0V, and the input voltage is higher or lower than the output voltage, the output voltage can maintain a stable low ripple output, and can automatically work in Boost or buck mode. The charge pump circuit using a boost circuit, effectively reducing the chip power consumption, especially in light load conditions to improve the conversion efficiency of the system. Circuit also has soft-start, over-temperature protection and over-current protection and other multiple protection functions. Simulation results have reached the predetermined target, design theory and practice is a combination of a valuable attempt.