Single-Inductor Quad-Output Switching Converter with Priority-Scheduled Program for Fast Transient Response and Unlimited Load Range in 40 nm CMOS Technology

Wei Chung Chen, Yi Ping Su, Tzu Chi Huang, Tsu Wei Tsai, Ruei Hong Peng, Kuei Liang Lin, Ke-Horng Chen, Ying Hsi Lin, Chao Cheng Lee, Shian Ru Lin, Tsung Yen Tsai

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

System-on-a-chip (SoC) applications require multiple power supply voltages with the features of low noise for analog circuits and high efficiency for digital circuits. Thus, this paper proposes the priority-scheduled program (PSP) for the single-inductor quad-output (SIQO) switching converter. This technique manages energy delivery to multiple outputs, facilitates fast transient response, and reduces cross-regulation simultaneously. Moreover, a level bypass detector (LBD) is used to overcome the limitation of significant loading differences among quad outputs in conventional designs because the PSP technique cantransfer additional energy to low-priority outputs to avoid overshoot voltage at high-priority outputs. Furthermore, voltage disturbance can be filtered out using two additional low-dropout regulators that operate as buffers cascaded at two low-priority outputs. Therefore, the SIQO converter that is fabricated in 40 nm CMOS technology satisfies the power requirements in portable electronics given its low cross-regulation of 0.2%, fast transient response of 15 \mu\hbox{s}, and an output voltage ripple that is smaller than 30 mV.

Original languageEnglish
Article number7098440
Pages (from-to)1525-1539
Number of pages15
JournalIEEE Journal of Solid-State Circuits
Volume50
Issue number7
DOIs
StatePublished - 1 Jul 2015

Keywords

  • Cross-regulation
  • fast transient
  • level bypass detector (LBD)
  • priority-scheduled program (PSP)
  • single-inductor quad-output (SIQO)

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