Smooth pole tracking technique by power MOSFET array in low-dropout regulators

Yung Hsin Lin*, Kuo Lin Zheng, Ke-Horng Chen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

This paper proposes an advanced ℚ-reduction technique of pole-splitting compensations for low dropout (LDO) regulator. The output pole is load dependent and may cause the scenario of complex poles when load current changes. LDO regulators may oscillate because high-ℚ incurs the less gain and phase margins. The reasons of causing complex poles depend on the design methodology. For the design of capacitor-free LDO regulator, high-ℚ issue happens when load current changes from heavy to light. Recent literature provides a method to alleviate the high-ℚ problem. However, large dropout voltage in case of suddenly large loads forces designers to include a small load capacitor as an indispensable component for supplying system-on-chip (SoC) systems. Different to the case of capacitor-free LDO regulators, high-ℚ issue happens when load current changes from light to heavy. According to our proposed power MOSFET array, the high-ℚ problem can be alleviated and prevent LDO regulators from oscillating when load changes. Experimental results promise the stability and show the improvement of load and line regulations.

Original languageEnglish
Pages (from-to)2421-2427
Number of pages7
JournalIEEE Transactions on Power Electronics
Volume23
Issue number5
DOIs
StatePublished - 15 Dec 2008

Keywords

  • Capacitor-free
  • Complex pole
  • Low-dropout regulator (LDO)
  • Power MOSFET array
  • Q-reduction

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