中圖分類號：TN432 文獻標志碼：A DOI: 10.16157/j.issn.0258-7998.234217
中文引用格式： 朱琪，黃登華. 基于負載追蹤補償的大電流LDO設計[J]. 電子技術應用，2024，50(3)：26-30.
英文引用格式： Zhu Qi，Huang Denghua. Design of a high current LDO based on load tracking technology[J]. Application of Electronic Technique，2024，50(3)：26-30.

Design of a high current LDO based on load tracking technology

Abstract： This paper presents an effective load tracking compensation scheme to improve the loop stability of high current low-dropout linear regulator (LDO). By the proposed technique, the influence of variable load on the loop stability is eliminated, besides the low frequency loop gain retains to high while the high frequency impedance is greatly attenuated, finally both high output precision and decent transient response performance is achieved simultaneously. Simulated by TSMC 0.18 µm BCD process, the results show that the circuit is capable of delivering load current up to 6 A. For a load step of 6 A/6 μs, the circuit has a maximum undershoot of 36.6 mV and a maximum overshoot of 35.3 mV, the stable time is less than 56.3 μs. The transient performance is greatly improved within the full load current range.

Key words : low-dropout linear regulator；load tracking；loop gain；transient response