中圖分類號：TN402 文獻標志碼：A DOI: 10.16157/j.issn.0258-7998.246058
中文引用格式： 楊尚爭，鄧新偉，毛佳烽，等. 一種雙向使能的負壓低壓差線性穩(wěn)壓器[J]. 電子技術(shù)應(yīng)用，2025，51(5)：10-14.
英文引用格式： Yang Shangzheng，Deng Xinwei，Mao Jiafeng，et al. A negative-voltage LDO with bidirectional enable[J]. Application of Electronic Technique，2025，51(5)：10-14.

A negative-voltage LDO with bidirectional enable

Abstract： This article presents the design and implementation of a negative-voltage low-dropout linear regulator (LDO) with bidirectional enable functionality. Firstly, the fundamental architecture and operational characteristics of the conventional negative-voltage LDO are introduced. Based on the application scenarios of the negative-voltage LDO, the necessity for bidirectional enable is put forward. Subsequently, the traditional enable circuit and the proposed bidirectional enable circuit are demonstrated, and analyses are conducted for both positive-voltage startup and negative-voltage startup scenarios. Finally, the negative-voltage LDO chip is designed and fabricated in a 350 nm CMOS process. The test results indicate that the negative-voltage LDO can achieve bidirectional startup within the enable signal range of greater than 0.96 V and less than 5 V, as well as greater than -5 V and less than -0.9 V. Moreover, the enable circuit consumes a current of 873 nA during the positive-voltage startup process and a current of 219 nA during the negative-voltage startup process.

Key words : low dropout regulator；negative-circuit；enable circuit；quiescent current