Minimized transient and steady-state cross regulation in 55-nm CMOS single-inductor dual-output (SIDO) step-down DC-DC converter

Yu Huei Lee*, Tzu Chi Huang, Yao Yi Yang, Wen Shen Chou, Ke-Horng Chen, Chen Chih Huang, Ying Hsi Lin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

A single-inductor dual-output (SIDO) step-down DC-DC converter with continuous conduction mode (CCM) operation is proposed to achieve an area-efficient power management module. The low-voltage energy distribution controller (LV-EDC) can simultaneously guarantee good voltage regulation and low output voltage ripple. With the proposed dual-mode energy delivery methodology, cross regulation in steady-state output voltage ripple, which is rarely discussed, and cross regulation in load transient response are both effectively reduced. In addition, the energy mode transition operation helps obtain the appropriate energy operation mode using the energy delivery paths for dual outputs. Moreover, within the allowable output voltage ripple, the automatic energy bypass (AEB) mechanism can reduce the number of energy delivery paths, thereby ensuring voltage regulation and further enhancing efficiency. The test chip, fabricated in 55-nm CMOS, occupies 1.44 mm2 and achieves 91% peak efficiency, low output voltage ripple, and excellent load transient response for a high-efficiency system-on-a-chip (SoC) integration.

Original languageEnglish
Article number6016217
Pages (from-to)2488-2499
Number of pages12
JournalIEEE Journal of Solid-State Circuits
Volume46
Issue number11
DOIs
StatePublished - 1 Nov 2011

Keywords

  • Cross regulation
  • energy bypass mechanism
  • energy delivery path
  • load transient response
  • output voltage ripple
  • power conversion efficiency
  • single-inductor dual-output (SIDO) converter

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