A 95 nA quiescent current hysteretic mode buck converter with sample and hold reference

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• 作者：Junxiao Chen ; Lenian He
• 关键词：Ultra ; low ; power ; Nano ampere circuit ; Hysteretic converter ; High efficiency
• 刊名：Analog Integrated Circuits and Signal Processing
• 出版年：2017
• 出版时间：March 2017
• 年：2017
• 卷：90
• 期：3
• 页码：645-651
• 全文大小：
• 刊物类别：Engineering
• 刊物主题：Circuits and Systems; Electrical Engineering; Signal,Image and Speech Processing;
• 出版者：Springer US
• ISSN：1573-1979
• 卷排序：90

文摘

A nano ampere (nA) hysteretic mode buck converter is presented in this paper. Nano ampere current sleep phase and fast response burst phase are implemented. The converter achieves nano-watt power consumption in sleep phase while ensures fast wake-up from sleep phase to burst phase. New developed ultra low power sample-hold voltage reference and 1 kHz oscillator draw currents of 20 and 10 nA respectively. The circuit was implemented in a 0.35 μm CMOS process. The measurement result shows that the converter’s quiescent current (Iq) in sleep phase is as low as 95 nA. Benefit from the ultra-low Iq, the circuit achieves conversion efficiency of 79.8% at 2 μA load, regulating output at 2.5 V with a 3.6 V supply. The peak efficiency is up to 94% at 50 mA load.