Low-dropout linear voltage regulator and bootstrap driving method thereof

By using an N-channel MOSFET, charge pump, and floating current mirror bootstrap driving method in a low-dropout linear regulator, combined with voltage feedback and current feedback loops, the output instability and current limiting protection problems of traditional LDOs under high voltage fluctuations are solved, achieving improved power rejection ratio in the high-frequency range and stability across the entire load range.

CN122387263APending Publication Date: 2026-07-143PEAK INC
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
3PEAK INC
Filing Date
2026-04-27
Publication Date
2026-07-14

AI Technical Summary

Technical Problem

Traditional low-dropout linear regulators suffer from decreased output voltage stability and deteriorated power rejection ratio when the high-voltage input power supply fluctuates drastically. Current limiting protection schemes struggle to balance speed and accuracy, and their stability is insufficient under wide load conditions.

Method used

An N-channel MOSFET is used as the power output transistor, and a charge pump and a floating current mirror are used to achieve bootstrapping drive. Combined with voltage feedback loop and current feedback loop, current limiting unit and clamping unit are set up to achieve fast and high-precision current limiting protection and adaptive current limiting threshold adjustment.

Benefits of technology

It effectively isolates the effects of high-voltage input power fluctuations, improves the power supply rejection ratio, ensures output voltage stability, achieves rapid current limiting protection and adaptive current limiting, and enhances system reliability and stability.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN122387263A_ABST
    Figure CN122387263A_ABST
Patent Text Reader

Abstract

The application provides a low-dropout linear regulator and a bootstrap driving method thereof. The low-dropout linear regulator comprises a bootstrap driving unit, a power output tube, and a control unit. The bootstrap driving unit comprises a charge pump and a floating current mirror. The charge pump is used to generate a bootstrap voltage varying with an output voltage of the low-dropout linear regulator. The floating current mirror generates a first current by using the bootstrap voltage as a power supply voltage. The bootstrap voltage is greater than the output voltage. The power output tube has a drain electrode coupled to a high-voltage input power supply, a gate electrode coupled to an output node of the first current, and a source electrode coupled to an output end of the low-dropout linear regulator. The control unit comprises a voltage feedback loop and a current feedback loop. The voltage feedback loop and the current feedback loop generate a driving signal for driving the power output tube by using the first current as a floating load. The application can maintain stable output under high input voltage fluctuation, can realize fast coarse current limiting and high-precision current limiting protection, has a differential voltage self-adaptive current limiting function to reduce the risk of overheating, and has higher output stability.
Need to check novelty before this filing date? Find Prior Art