Low voltage linear regulator with overshoot suppression

By introducing a soft-start loop and a fast charge discharge path into the low-voltage linear regulator, the output overshoot problem caused by the slow response of the negative feedback loop is solved, achieving stable voltage establishment and fast overshoot suppression, thus improving the stability and efficiency of the system.

CN121165872BActive Publication Date: 2026-05-26DIOO MICROCIRCUITS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DIOO MICROCIRCUITS CO LTD
Filing Date
2025-09-26
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Low-voltage linear regulators suffer from slow negative feedback loop response during startup or when load current changes, leading to output voltage overshoot and potential damage to the load circuit. Existing optimization methods suffer from low efficiency, stability risks, or limited response capabilities.

Method used

Design a low-voltage linear regulator with overshoot suppression function. It adopts PMOS transistors, NMOS transistors, soft-start circuit, operational amplifier and overshoot suppression circuit. The circuit structure is optimized by soft-start loop to increase the fast charge discharge path at the load end and quickly release excess charge when overshoot is detected to avoid loop competition.

Benefits of technology

It achieves stable voltage establishment during startup, avoids loop competition, quickly suppresses output overshoot, ensures system stability and responsiveness, and improves the safety and efficiency of the load side.

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Abstract

This invention discloses a low-voltage linear regulator with overshoot suppression function, comprising a PMOS transistor M 4a PMOS transistor M 4b The circuit includes a soft-start circuit, NMOS transistor M1, PMOS transistor M2, resistors R1, R2, R3, and R4, operational amplifier A1, overshoot suppression circuit, and load capacitor C. L The invention adds a soft-start loop to optimize the internal circuit structure, ensuring that the voltage is stably established before connecting to the main feedback loop during startup, thereby avoiding loop competition. The invention also adds a fast charge discharge path at the load end and adds an operational amplifier OUT2 node. When an overshoot is detected, the discharge path from the output end to GND is opened through digital logic to quickly release excess charge. The path is automatically closed after the output voltage returns to the rated value.
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