Design of high efficiency dual-mode buck DC-DC converter  

作　　者：来新泉 曾华丽 叶强 何惠森 张莎莎 孙煜晴 

机构地区：[1]Institute of Electronic CAD,Xidian University [2]Key Laboratory of High-Speed Circuit Design and EMC,Ministry of Education,Xidian University

出　　处：《Journal of Semiconductors》2010年第11期88-92,共5页半导体学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.60876023)

摘　　要：A buck DC-DC switching regulator with high efficiency is implemented by automatically altering the modulation mode according to load current,and it can operate with an input range of 4.5 to 30 V.At light load current,the converter operates in skip mode.The converter enters PWM mode operation with increasing load current.It reduces the switching loss at light load and standby state,which results in prolonging battery lifetime and stand-by time.Meanwhile, externally adjustable soft-start minimizes the inrush supply current and avoids the overshoot of output voltage at initial startup.The regulator is fabricated by a 0.6μm CDMOS process.The test results show that,under the condition of 3.3 V output,the efficiency is up to 64%at 5 mA and the maximum efficiency is 95.5%.A buck DC-DC switching regulator with high efficiency is implemented by automatically altering the modulation mode according to load current,and it can operate with an input range of 4.5 to 30 V.At light load current,the converter operates in skip mode.The converter enters PWM mode operation with increasing load current.It reduces the switching loss at light load and standby state,which results in prolonging battery lifetime and stand-by time.Meanwhile, externally adjustable soft-start minimizes the inrush supply current and avoids the overshoot of output voltage at initial startup.The regulator is fabricated by a 0.6μm CDMOS process.The test results show that,under the condition of 3.3 V output,the efficiency is up to 64%at 5 mA and the maximum efficiency is 95.5%.

关 键 词：high efficiency soft-start skip mode PWM mode 

分 类 号：TM46[电气工程—电器]