Digitally Controlled low-dropout regulator with fast-transient and autotuning algorithms

Yen Chia Chu, Le-Ren Chang-Chien

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

A digitally controlled low-dropout voltage regulator (LDO) that can perform fast-transient and autotuned voltage is introduced in this paper. Because there are still several arguments regarding the digital implementation on the LDOs, pros and cons of the digital control are first discussed in this paper to illustrate its opportunity in the LDO applications. Following that, the architecture and configuration of the digital scheme are demonstrated. The working principles and design flows of the functional algorithms are also illustrated and then verified by the simulation before the circuit implementation. The proposed LDO was implemented by the 0.18-μm manufacturing process for the performance test. Experimental results show that the LDO's output voltage V\rm out can accurately perform the dynamic voltage scaling function at various V\rm out levels (1/2, 5/9, 2/3, and 5/6 of the input voltage V\bf DD) from a wide V\bf DD range (from 1.8 to 0.9 V). The transient time is within 2 μs and the voltage spikes are within 50 mV when a 1-μF output capacitor is used. Test of the autotuning algorithm shows that the proposed LDO is able to work at its optimal performance under various uncertain conditions.

Original languageEnglish
Article number6363610
Pages (from-to)4308-4317
Number of pages10
JournalIEEE Transactions on Power Electronics
Volume28
Issue number9
DOIs
Publication statusPublished - 2013 Mar 11

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Electric potential
Voltage regulators
Capacitors
Networks (circuits)
Voltage scaling

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Cite this

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Digitally Controlled low-dropout regulator with fast-transient and autotuning algorithms. / Chu, Yen Chia; Chang-Chien, Le-Ren.

In: IEEE Transactions on Power Electronics, Vol. 28, No. 9, 6363610, 11.03.2013, p. 4308-4317.

Research output: Contribution to journalArticle

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