中圖分類號：TN432
文獻標志碼：A
DOI: 10.16157/j.issn.0258-7998.233747
引用格式： 李天碩,，李嚴,，劉瑩. 無片外電容LDO的研究進展[J]. 電子技術應用，2023,，49(11)：35-41.

Progress research on LDO without off chip capacitor

Abstract： Low dropout linear regulator (LDO) is responsible for providing stable power supply voltage in the circuit system. It is a widely used power management chip. With the continuous improvement of integration and technology, the capacitor-free LDO gradually replaces the LDO with off chip and becomes the focus of research. However, the capacitor-free LDO needs additional compensation circuit to solve the problem of poor stability and transient response characteristics. In order to know the mainstream design ideas in the current industry, a large number of literatures were investigated, the research status of the capacitor-free LDO was analyzed, and the schemes to improve the stability and transient response characteristics were summarized, the technical points were refined, the advantages and disadvantages were evaluated, at last the room for improvement was proposed and the future research direction was prospected.

Key words : low dropout linear regulator；capacitor-free LDO,；compensation circuit,；stability；transient response characteristics