JPEE  Vol.2 No.4 , April 2014
An Ultra-Low Quiescent Current CMOS Low-Dropout Regulator with Small Output Voltage Variations
Abstract: 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.
Cite this paper: Cheng, X. , Yang, Y. , Du, L. , Chen, Y. , 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.

[1]   Rincon-Mora, G.A. and Allen, P.E. (1998) A Low-Voltage, Low Quiescent Current, Low Drop-out Regulator. IEEE Journal of Solid-State Circuits, 33, 36-44.

[2]   Leung, K.N. and Mok, P.K.T. (2003) A Capacitor-Free CMOS Low-Dropout Regulator with Damping-Factor-Control Frequency Compensation. IEEE Journal of Solid-State Circuits, 38, 1691-1702.

[3]   Al-Shyoukh, M., Lee, H. and Perez, R. (2007) A Transient-Enhanced Low-Quiescent Current Low-Dropout Regulator with Buffer Impedance Attenuation. IEEE Journal of Solid-State Circuits, 42, 1732-1742.

[4]   Or, P.Y. and Leung, K.N. (2010) An Output-Capacitor Less Low-Dropout Regulator with Direct Voltage-Spike Detection. IEEE Journal of Solid-State Circuits, 45, 458-466.

[5]   Leung, K. and Ng, Y.S. (2010) A CMOS Low-Dropout Regulator with a Momentarily Current-Boosting Voltage Buffer. IEEE Transactions on Circuits and Systems I: Regular Papers, 57, 2312-2319.

[6]   Hu, J., Hu, B., Fan, Y. and Ismail, M. (2011) A 500 nA Quiescent, 100 mA Maximum Load CMOS Low-Dropout Regulator. IEEE International Conference on Electronics, Circuits and Systems, 386-389.

[7]   Guo, J., Cao, Y. and Lai, X. (2009) An Inner ESR-Fungible Compensation Technique for Ultra-Low Power Low Dropout Regulators. Analog Integrated Circuits and Signal Processing, 61, 265-270.

[8]   Salehi, M.R. and Mohammadalinejadi, S. (2013) A Low Dropout Voltage Regulator with Enhanced Transconductance Error Amplifier and Small Output Voltage Variations. Proceeding of Iranian Electrical Engineering Conference, 1-5.

[9]   Huang, C.H., Ma, Y.T. and Liao, W.C. (2013) Design of a Low-Voltage Low-Dropout Regulator. IEEE Transactions on Very Large Scale Integration Systems, 99, 1-5.

[10]   Gutierrez, L., Roa, E. and Hernandez, H. (2009) A Current Efficient, Low-Dropout Regulator with Improved Load Regulation. IEEE Workshop on Microelectronics and Electron Devices, 1-4.

[11]   Hazucha, P., Karnik, T., Bradley, B.A., Parsons, C., Finan, D. and Borkar, S. (2005) Area-Efficient Linear Regulator with Ultra-Fast Load Regulation. IEEE Journal of Solid-State Circuits, 40, 933-940.

[12]   Man, T.Y., Mok, P.K.T. and Chan, M. (2007) A High Slew-Rate Push-Pull Output Amplifier for Low-Quiescent Current Low-Dropout Regulators with Transient-Response Improvement. IEEE Transactions on Circuits and Systems II: Express Briefs, 54, 755-759.