Capless Regulators – Addressing Load Transient Challenges

Author : Walid Aouimeur

Table of Contents
  • Introduction and motivation
  • Load Transient Phenomena
  • Design Considerations of CL-LDO
  • Logic Load and Average Current
  • Load Transient and Voltage Regulator Accuracy
  • Capacitance Impact on Load Transient
  • Methodology for Load Transient Measurement
  • Real-World Applications and Implementations
  • Summary and Conclusion

Introduction

Modern portable electronics devices impose stringent requirements on power management integrated circuits (ICs). In particular, the load regulation capability of low-dropout regulators (LDOs) is in high demand. Traditional LDOs rely on large output capacitors for load transient compensation, whereas capless regulators connect directly to the load and depend on alternative compensation techniques.

This white paper examines the load transients of recently proposed capless regulators, emphasizing fundamental aspects that are often overlooked. Load transient analysis is both a practical design concern and a theoretical exploration. It is a practical consideration because ensuring robust load transient regulation is typically one of the final challenges in designing this class of circuits.

Contact

© 2024 Copyright by Dolphin Semiconductor – All Rights Reserved