Fully tunable software defined DC-DC converter with 3000X output current & 4X output voltage ranges

Saurabh Chaubey, Ramesh Harjani

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


This paper presents a fully Integrated, software defined capacitive DC-DC converter. The converter implements K-F-C tuning (K = conversion ratio, F = frequency and C = capacitance) in real time so as to accommodate any output load. It has a 4X tunable output voltage, supports a 3269X output load current range while achieving a peak efficiency of 82.1%. This design introduces an accumulation floating junction MOS capacitor that is used for the 18.3 fF/μm2 bucket-capacitors with less than 2μA/mm2 leakage. This leakage is 40X lower than standard MOS capacitors. The converter transforms a 1.0V input to a 0.25-0.95V output for a 0.13mA-425mA load range while maintaining better than 70% efficiency. The power density for better than at 70% efficiency is 1.05W/mm2 (@ Vout=430mV) while peak value is 2.15/mm2. Load regulation is implemented using capacitive and frequency tuning in digital and analog domains respectively. The design was fabricated in TSMC 65nm.

Original languageEnglish (US)
Title of host publication38th Annual Custom Integrated Circuits Conference
Subtitle of host publicationA Showcase for Integrated Circuit Design in Silicon Hills, CICC 2017
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781509051915
StatePublished - Jul 26 2017
Event38th Annual Custom Integrated Circuits Conference, CICC 2017 - Austin, United States
Duration: Apr 30 2017May 3 2017

Publication series

NameProceedings of the Custom Integrated Circuits Conference
ISSN (Print)0886-5930


Other38th Annual Custom Integrated Circuits Conference, CICC 2017
Country/TerritoryUnited States

Bibliographical note

Publisher Copyright:
© 2017 IEEE.


  • KFC tuning
  • Software defined DC-DC converter
  • fully-integrated
  • high density capacitor
  • wide output range


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