基于电荷泵的低压启动高效率Boost DC/DC变换器设计  

The Low-Voltage Start up and High Efficiency Boost DC/DC Converter Design Based on Charge Pump

作　　者：丁德彬[1] 杨依忠[1] 张章[1] 解光军[1] 

机构地区：[1]合肥工业大学电子科学与应用物理学院,合肥230009

出　　处：《电子器件》2013年第2期211-216,共6页Chinese Journal of Electron Devices

基　　金：安徽省高等学校省级自然科学研究重点项目(KJ2011A213);合肥工业大学校基金(2011HGXJ1073;2011HGXJ1063)

摘　　要：设计了一块将电荷泵的低压启动模块与Boost DC/DC升压模块集成在一起的芯片上,实现宽输入电压工作范围的电源管理芯片。介绍了该芯片的组成、各模块工作原理与设计,最后给出实验结果。在单电池供电的系统中具有一定的参考价值。芯片采用SMIC 0.5μm CMOS工艺设计并流片测试,在0.83 V的电源电压时,芯片能正常启动工作。在电压VIN=1.2 V,VOUT=3.3 V时,最大效率达到87%,所有电压和负载范围内效率不低于50%。A charge pump in low voltage start-up module and Boost DC/DC step-up module is designed to integrate on a chip to achieve a wide input voltage range of power management. The composition of the chip,the design and work principles of the module, and finally experimental results were all introduced. The chip has its certain reference value in a single battery-powered system. The chip is designed by using design SMIC 0.5 μm CMOS process and to test in tape transport. The chip can normally start work to a power supply voltage of 0.83 V. When VIN = 1.2 V, VOUT = 3.3 V, the maximum efficiency reaches 87% ,and in all voltage and load range the efficiency is not less than 50%.

关 键 词：开关电源 低压启动 电荷泵 脉冲频率调制(PFM) 脉冲宽度调制(PWM) 

分 类 号：TN624[电子电信—电路与系统]