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

作者：Sung Eun Taek; Park Sangyong; Baek Donghyun^*

来源：Energies, 2018, 11(3): 688.

DOI：10.3390/en11030688

• power management integrated circuit
• output capacitor-less LDO
• frequency compensation
• fast-transient response

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 mu A was achieved. The LDO was fabricated in 130 nm CMOS process consuming 180 x 140 mu m(2) of the silicon area.

• 出版日期2018-3