A negative-voltage LDO with bidirectional enable

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 applicatio...

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Bibliographic Details
Published inDiànzǐ jìshù yīngyòng Vol. 51; no. 5; pp. 10 - 14
Main Authors Yang Shangzheng, Deng Xinwei, Mao Jiafeng, Hu Weibo, Shang Jiabin
Format Journal Article
LanguageChinese
Published National Computer System Engineering Research Institute of China 01.05.2025
Subjects
enable circuit
low dropout regulator
negative-circuit
quiescent current
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ISSN0258-7998
DOI10.16157/j.issn.0258-7998.246058

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Summary: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 curr
ISSN:0258-7998
DOI:10.16157/j.issn.0258-7998.246058