A novel embedded soft-start circuit for SOC power supply

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 load...

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Bibliographic Details
Published in:Journal of semiconductors 2010-05 (5), p.133-138
Main Author: 郭仲杰 吴龙胜 刘佑宝 张倩
Format: Article
Language:chi ; eng
Subjects:
SOC
启动电压
嵌入式
承载能力
电源排序
系统级芯片
软启动电路
输出精度
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Summary: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.
ISSN:1674-4926
DOI:10.1088/1674-4926/30/5/055012