A Low Quiescent Current Fast Transient LDO Regulator With Segmented Pass Transistors

Also Available Domains Cadence EDA|Nano Technology|Low Power VLSI

Project Code :TVMABE337

Objective

The main objective of this work is to design and implement a low dropout (LDO) voltage regulator that achieves low quiescent current while providing fast transient response during rapid load variations. The regulator aims to balance power efficiency and stability by using segmented pass transistors to dynamically adjust the drive strength according to the load current demand. This approach minimizes power loss under light loads while maintaining high performance and quick settling under heavy load conditions.

Abstract

This project presents a low quiescent current, fast-transient Low Dropout (LDO) regulator that employs segmented pass transistors to achieve high efficiency across varying load conditions. The segmentation technique allows the regulator to activate only the required pass-device sections depending on the instantaneous load, thereby minimizing static current during light-load operation while providing strong drive capability during sudden load transients. This adaptive structure significantly improves transient response by reducing voltage undershoot and overshoot, without compromising stability or power efficiency. With its combination of ultra-low quiescent current and rapid load regulation, the proposed LDO design is well suited for battery-powered, portable, and energy-constrained electronic systems.

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