A 180 nA Quiescent Current Digital Control Dual-Mode Buck Converter With a Pulse-Skipping Load Detector for Long-Range Applications

Tsung Heng Tsai, Tsung Wen Sun, Kuan Yu Liao, Chia Chan Chang

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

A digitally controlled dual-mode buck converter using low quiescent current is proposed in this work. In particular, the proposed dual pulse-skipping mode adopts a pulse-skipping adaptive on-time (PSAOT) mode for heavy load; and a pulse-skipping asynchronous mode (PSAM) for light and ultra-light loads to achieve a 100,000X wide load range for the Long-range (LoRa) application. Specifically, the pulse-skipping mode selector adopts a digital logic circuit to realize the 180nA low quiescent current. In addition, a low-power dynamic comparator with an adjustable offset is used to accelerate the transient response. The proposed converter is fabricated in a TSMC 350 nm CMOS process and results in an output voltage of 3.3 V from 5V to 4.2 V input voltage range. These results show that the overall system achieves 92.9 % peak eficiency at 8 mA output load and a figure of merit (FoM) of 2.29.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalIEEE Transactions on Circuits and Systems I: Regular Papers
DOIs
StateAccepted/In press - 2023

Keywords

  • Adaptive-on-time (AOT)
  • Buck converters
  • Detectors
  • digital control power converter
  • dual-mode
  • Hysteresis
  • Inductors
  • long-range (LoRa) applications
  • pulse-skipping modulation (PSM)
  • Switches
  • Transient response
  • ultra-low power
  • Wireless sensor networks

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