A novel embedded soft-start circuit for SOC power supply  

作　　者：郭仲杰 吴龙胜 刘佑宝 张倩 

机构地区：[1]Xi'an Microelectronic Technology Institute [2]School of Microelectronics,Xidian University

出　　处：《Journal of Semiconductors》2010年第5期133-138,共6页半导体学报（英文版）

摘　　要：To improve the power sequencing performance of the system-on-a-chip（SOC）,a novel embedded soft-start circuit is presented.A seamless soft-start reference voltage is obtained with 7 bits DAC,which can not only restrain the turning point overshoot,but also improve the output accuracy and the poor loading capability,reduce the pin number and save PCB area.The whole DC-DC converter has been fabricated in a 0.35μm CMOS process.The measurement results show that the chip starts up successfully with 250μs soft-start time under conditions of 400 kHz switching frequency,2.5 V DC-DC output and 1.8 V LDO output.Stable operation after soft-start is also shown.To improve the power sequencing performance of the system-on-a-chip（SOC）,a novel embedded soft-start circuit is presented.A seamless soft-start reference voltage is obtained with 7 bits DAC,which can not only restrain the turning point overshoot,but also improve the output accuracy and the poor loading capability,reduce the pin number and save PCB area.The whole DC-DC converter has been fabricated in a 0.35μm CMOS process.The measurement results show that the chip starts up successfully with 250μs soft-start time under conditions of 400 kHz switching frequency,2.5 V DC-DC output and 1.8 V LDO output.Stable operation after soft-start is also shown.

关 键 词：SOC current mode converter soft-start loading capability 

分 类 号：TN47[电子电信—微电子学与固体电子学]