A High Efficiency Synchronous CMOS Switching Buck Regulator with Accurate Current Sensing Technique

• Main Authors: Hsin-Hsin Ko, 柯欣欣
• Other Authors: Kuo-Hsing Cheng
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/03389186369919249458

碩士 === 國立中央大學 === 電機工程研究所 === 96 === The fast growing demand of portable and battery-operated electronic systems has driven the efforts to reduce power consumption or to improve the efficiency of these electronic equipments. Regulators are essential for most electrically powered systems which include the prevalent portable equipments. Regulators are required to reduce the voltage variations of the battery. Besides, regulators are often utilized to provide a lower voltage from a higher input voltage for power reduction. Current trend in portable or battery-powered electronics demands ultra-low-power consumption or high operating efficiency to prolong the service time of these battery-operated equipments. In this thesis, the proposed current mode buck converter senses the inductor current variation to accelerate response time, and applies the mechanism of feedback-loop theory to control the output voltage at the desired value. Compared with the voltage mode buck converter, the current mode buck converter has better load regulation, better line regulation and faster transient response. The proposed buck converter has high efficiency, and, therefore, it is suitable for the application of portable products. This current mode switching regulator is fabricated with TSMC 0.18um 3.3V CMOS process. In the proposed buck converter, the operation voltage is form 2.4V to 4.6V, the loading current is form 0.05A to 0.5A, and the efficiency is 91.16%. The line regulation and load regulation are 6.27mV/V and 0.0107mV/mA respectively. The core area is 0.711mm2.