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

Eun-Taek Sung, Sangyong Park and Donghyun Baek
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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

Energies, 2018, vol. 11, issue 3, 1-11

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 ?A was achieved. The LDO was fabricated in 130 nm CMOS process consuming 180 × 140 ?m 2 of the silicon area.

Keywords: power management integrated circuit; output capacitor-less LDO; frequency compensation; fast-transient response (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
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