单片集成直流-直流转换器的效率提高方法  

Improvement on the Conversion Efficiency of Fully Integrated DC-DC Converters

作　　者：倪金华[1] 洪志良[1] 刘洋 

机构地区：[1]复旦大学专用集成电路与系统国家重点实验室,上海201203 [2]亚德诺半导体技术(上海)有限公司,上海200021

出　　处：《固体电子学研究与进展》2010年第2期287-291,共5页Research & Progress of SSE

基　　金：国际合作项目:ADI公司项目资助

摘　　要：采用SMIC 0.13μm CMOS工艺,设计实现了开关频率达到250 MHz,单片集成的降压型电源转换器。为了提高电源转换效率,该转换器中的片上电感采用非对称性设计方法,提高了电感的品质因数。采用了高密度片上滤波电容来稳定输出电压,同时对单位电容尺寸的优化设计减小了电容的等效串联电阻以及输出电压纹波。测试结果表明,芯片输入电压为3.3 V,当输出2.5 V电压时,峰值效率达到了80%,最大输出电流达到270 mA;当输出1.8 V电压时,峰值效率达到了70%,最大输出电流达到400 mA。A fully integrated step-down DC-DC converter with the switching frequency up to 250 MHz is realized in SMIC 0.13 μm CMOS technology.In order to improve the power conversion efficiency,the on-chip inductor of the converter has an asymmetric structure to improve the quality factor of the inductor.A high-density on-chip capacitor is used to smooth the output voltage.Straightforward analysis of the capacitor structure results in optimal size of each cell and minimal ESR of the capacitor.Measurement results show that the converter can achieve 80% and 70% peak efficiency for an output of 2.5 V and 1.8 V,respectively,when the input voltage is 3.3 V.The maximum output current of the converter is 270 mA and 400 mA for an output of 2.5 V and 1.8 V,respectively.

关 键 词：单片集成 直流-直流转换器 片上电感 片上电容 

分 类 号：TN761[电子电信—电路与系统]