Low dropout linear regulator with fast dynamic response and high stability

By combining an error amplifier, a Class AB buffer stage circuit, a positive feedback resistor compensation circuit, and an undervoltage detection circuit, the overshoot and undershoot problems of the low dropout linear regulator under load changes are solved, achieving fast response and high stability, and ensuring normal system startup.

CN122331689APending Publication Date: 2026-07-03WUXI ZHONGKE MICROELECTRONICS IND TECH RES INST
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Patent Information

Application Number
CN202610592914.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-30
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Low dropout linear regulators are susceptible to output voltage disturbances when the load conditions change dynamically, exhibiting overshoot and undershoot phenomena, long recovery time, and potential system failure due to untimely startup. The reduced feedback loop gain also affects the accuracy of the output voltage.

Method used

The circuit employs a combination of an error amplifier, a Class AB buffer stage circuit, a positive feedback resistor compensation circuit, an undervoltage detection circuit, and a startup circuit to improve transient characteristics, enhance phase margin and stability, and incorporate undervoltage detection functionality.

Benefits of technology

It achieves rapid dynamic response, basically eliminates overshoot and undershoot, significantly shortens recovery time, ensures stable system startup, and improves output voltage accuracy while maintaining loop gain.

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Abstract

The invention belongs to the field of analog integrated circuit design, and particularly relates to a low dropout linear regulator with fast dynamic response and high stability. Comprising an error amplifier, a Class AB buffer stage circuit, an output power tube, a positive feedback resistance compensation circuit, an undervoltage detection circuit and a starting circuit. The Class AB buffer stage circuit is used for improving the transient characteristic of the low dropout linear regulator, and the positive feedback resistance compensation circuit is used for improving the phase margin of the low dropout linear regulator. According to the invention, rapid dynamic response can be realized, overshoot and undershoot phenomena are basically eliminated, the recovery time is greatly shortened, high stability is realized under the condition of ensuring loop gain, functions of undervoltage detection and the like are realized, and smooth starting of the system can be ensured.
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