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

Energies

Sangyong Park¹  Donghyun Baek¹  Eun-Taek Sung² 

[1] School of Electrical Engineering, Chung-Ang University, Seoul 06974, Korea;School of Electrical Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea;

关键词: power management integrated circuit;    output capacitor-less LDO;    frequency compensation;    fast-transient response;   

DOI  :  10.3390/en11030688

来源: DOAJ

【 摘 要 】

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 μm2 of the silicon area.

【 授权许可】

Unknown