A fast-transient response capacitor-less LDO regulator with undershoot/overshoot voltage detection and transient-current enhanced circuit

Pengfei Liao; Lin Pu; Kai Luo; Peng Li; Feng Yang; Guoqiang Wang; Xiaozong Huang

doi:10.1117/12.2685808

15 August 2023 A fast-transient response capacitor-less LDO regulator with undershoot/overshoot voltage detection and transient-current enhanced circuit

Pengfei Liao, Lin Pu, Kai Luo, Peng Li, Feng Yang, Guoqiang Wang, Xiaozong Huang

Author Affiliations +

Proceedings Volume 12719, Second International Conference on Electronic Information Technology (EIT 2023); 127190N (2023) https://doi.org/10.1117/12.2685808
Event: Second International Conference on Electronic Information Technology (EIT 2023), 2023, Wuhan, China

Abstract

The traditional capacitor-less LDO is analyzed and a fast-transient response capacitor-less LDO with transient-current enhanced circuit is proposed in this paper. The overshot/undershot voltage can be detected when the load current makes changed, the transient-current enhanced circuit, based on AC couple network, can achieve high charging/discharging current of the gate of power transistor to improve the transient of the LDO. Based on the proposed frequency strategy, the on-chip compensation capacitor required is reduced and the area of the chip is minimized. The circuit is simulated in a 0.13μm standard CMOS and the quiescent current is 30 μA. When the load current changes from 1-50mA at 1μs, the maximum overshot (undershot) voltage is 79mV (46mV) Compared to the LDO without transient enhance circuit, it is improved 60.5% and 58.2%, respectively.

Citation Download Citation

Pengfei Liao, Lin Pu, Kai Luo, Peng Li, Feng Yang, Guoqiang Wang, and Xiaozong Huang "A fast-transient response capacitor-less LDO regulator with undershoot/overshoot voltage detection and transient-current enhanced circuit", Proc. SPIE 12719, Second International Conference on Electronic Information Technology (EIT 2023), 127190N (15 August 2023); https://doi.org/10.1117/12.2685808

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