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A Fast-Transient Output Capacitor-Less Low-Dropout Regulator Using Active-Feedback and Current-Reuse Feedforward Compensation

Author

Listed:
  • Eun-Taek Sung

    (School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea)

  • Sangyong Park

    (School of Electrical Engineering, Chung-Ang University, Seoul 06974, Korea)

  • Donghyun Baek

    (School of Electrical Engineering, Chung-Ang University, Seoul 06974, Korea)

Abstract

In this paper, output capacitor-less low-dropout (LDO) regulator using active-feedback and current-reuse feedforward compensation (AFCFC) is presented. The open-loop transfer function was obtained using small-signal modeling. The stability of the proposed LDO was analyzed using pole-zero plots, and it was confirmed by simulations that the stability was ensured under the load current of 50 mA. The proposed compensation method increases gain-bandwidth product (GBW) and reduces the on-chip compensation capacitor. The proposed AFCFC technique was applied to a three-stage output capacitor-less LDO. The LDO has a GBW of 5.6 MHz with a small on-chip capacitor of 2.6 pF. Fast-transient time of 450 ns with low quiescent current of 65.8 μA was achieved. The LDO was fabricated in 130 nm CMOS process consuming 180 × 140 μm 2 of the silicon area.

Suggested Citation

  • Eun-Taek Sung & Sangyong Park & Donghyun Baek, 2018. "A Fast-Transient Output Capacitor-Less Low-Dropout Regulator Using Active-Feedback and Current-Reuse Feedforward Compensation," Energies, MDPI, vol. 11(3), pages 1-11, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:688-:d:137015
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