Adaptive switching frequency buck DC-DC converter with high-accuracy on-chip current sensor  

作　　者：江金光 黄飞 熊智慧 

机构地区：[1]Global Navigation Satellite System Research Center,Wuhan University

出　　处：《Journal of Semiconductors》2015年第5期111-119,共9页半导体学报（英文版）

基　　金：Project supported by the National Natural Science Foundation of China(No.41274047);the Natural Science Foundation of Jiangsu Province(No.BK2012639);the Science and Technology Enterprises in Jiangsu Province Technology Innovation Fund(No.BC2012121);the Changzhou Science and Technology Support(Industrial)Project(No.CE20120074)

摘　　要：A current-mode PWM buck DC-DC converter is proposed. With the high-accuracy on-chip current sen- sor, the switching frequency can be selected automatically according to load requirements. This method improves efficiency and obtains an excellent transient response. The high accuracy of the current sensor is achieved by a simple switch technique without an amplifier. This has the direct benefit of reducing power dissipation and die size. Additionally, a novel soft-start circuit is presented to avoid the inrush current at the starting up state. Finally, this DC-DC converter is fabricated with the 0.5μm standard CMOS process. The chip occupies 3.38 mm2. The accuracy of the proposed current sensor can achieve 99.5% @ 200 mA. Experimental results show that the peak efficiency is 91.8%. The input voltage ranges from 5 to 18 V, while a 2 A load current can be obtained.A current-mode PWM buck DC-DC converter is proposed. With the high-accuracy on-chip current sen- sor, the switching frequency can be selected automatically according to load requirements. This method improves efficiency and obtains an excellent transient response. The high accuracy of the current sensor is achieved by a simple switch technique without an amplifier. This has the direct benefit of reducing power dissipation and die size. Additionally, a novel soft-start circuit is presented to avoid the inrush current at the starting up state. Finally, this DC-DC converter is fabricated with the 0.5μm standard CMOS process. The chip occupies 3.38 mm2. The accuracy of the proposed current sensor can achieve 99.5% @ 200 mA. Experimental results show that the peak efficiency is 91.8%. The input voltage ranges from 5 to 18 V, while a 2 A load current can be obtained.

关 键 词：DC-DC switching frequency current sensor soft-start wide load range 

分 类 号：TM46[电气工程—电器]