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

作者：Chen, Junxiao; He, Lenian^*

来源：Analog Integrated Circuits and Signal Processing, 2017, 90(3): 645-651.

DOI：10.1007/s10470-016-0896-9

• Ultra-low-power
• Nano ampere circuit
• Hysteretic converter
• High efficiency

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 mu m 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 mu A load, regulating output at 2.5 V with a 3.6 V supply. The peak efficiency is up to 94% at 50 mA load.

• 出版日期2017-3
• 单位浙江大学