An Ultra-Low Quiescent Current CMOS Low-Dropout Regulator with Small Output Voltage Variations

DOI: 10.4236/jpee.2014.24064   PDF   HTML     6,070 Downloads   7,855 Views   Citations


An ultra-low quiescent current low-dropout regulator with small output voltage variations and improved load regulation is presented in this paper. It makes use of dynamically-biased shunt feedback as the buffer stage and the LDO regulator can be stable for all load conditions. The proposed structure also employs a momentarily current-boosting circuit to reduce the output voltage to the normal value when output is switched from full load to no load. The whole circuit is designed in a 0.18 μm CMOS technology with a quiescent current of 550 nA. The maximum output voltage variation is less than 20 mV when used with 1 μF external capacitor.

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Cheng, X. , Yang, Y. , Du, L. , Chen, Y. and Xie, G. (2014) An Ultra-Low Quiescent Current CMOS Low-Dropout Regulator with Small Output Voltage Variations. Journal of Power and Energy Engineering, 2, 477-482. doi: 10.4236/jpee.2014.24064.

Conflicts of Interest

The authors declare no conflicts of interest.


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