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

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Abstract

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.

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Authors and Affiliations

  1. Hangzhou, China

    Junxiao Chen & Lenian He

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  1. Junxiao Chen
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  2. Lenian He
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Correspondence to Lenian He.

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Chen, J., He, L. A 95 nA quiescent current hysteretic mode buck converter with sample and hold reference. Analog Integr Circ Sig Process 90, 645–651 (2017). https://doi.org/10.1007/s10470-016-0896-9

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  • DOI: https://doi.org/10.1007/s10470-016-0896-9

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