A digitally controlled DC-DC buck converter with automatic digital PFM to PWM transition scheme

Navankur Beohar, Debashis Mandal, Vivek Parasuram, Abhiram Mumma Reddy, Amit Kumar, Venkata N.K. Malladi, Karthik Pappu, Chao Fu, Philippe C. Adell, Bertan Bakkaloglu

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

An automatic fully-digital pulse frequency modulation (PFM) to pulse width modulation (PWM) mode transition scheme for digitally controlled DC-DC buck converter is proposed in this paper. The meta-stability issues of time-based analog-to-digital converter (ADC) which result in incorrect loop control and output voltage artifacts are also addressed in the proposed design. The digital controller is designed and fabricated on a 0.18 μm 6 layer-metal CMOS technology with an active area of 1.61 mm2. The converter operates at a switching frequency of 1 MHz and supports a regulated output voltage ranging from 0.9 V to 3.3 V for an input voltage range between 3.3 V to 5 V. The converter can supply a maximum load current of 7.5 A, and has the peak efficiency of 95.56%.

Original languageEnglish (US)
Title of host publication2021 IEEE Applied Power Electronics Conference and Exposition, APEC 2021
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages517-522
Number of pages6
ISBN (Electronic)9781728189499
DOIs
StatePublished - Jun 14 2021
Event36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021 - Virtual, Online, United States
Duration: Jun 14 2021Jun 17 2021

Publication series

NameConference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Conference

Conference36th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2021
Country/TerritoryUnited States
CityVirtual, Online
Period6/14/216/17/21

Keywords

  • Automatic mode switching
  • Digital control
  • Digitally-controlled pulse-width modulation (DPWM)
  • Dual-mode PFM/PWM converter
  • Fully-digital PFM to PWM transition
  • Pulse-frequency modulation (PFM)
  • Pulse-width modulation (PWM)
  • Synchronous DC-DC buck converter

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

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