A High-Input-Voltage Wide-Load LDO with Improved Load-Dependent Zero Mobile Compensation

In this paper, the load-dependent zero mobile compensation (LZMC) used in low-dropout regulators (LDOs) is analyzed reliably in regard to the issue of unrecoverable oscillation of the output voltage caused by loop instability when there is a large or drastic change in load. Based on the understanding gained from this analysis, a dynamic-resistance-boosting circuit (DRBC) is proposed to improve LZMC performance and solve this problem. Additionally, this paper proposes a high-voltage wide-load three-stage LDO with improved LZMC. Finally, the claimed improvements are verified through calculation and simulation.