An Efficient and Small Area Multioutput Switched Capacitor Buck Converter for IoTs

Dima Kilani, Mohammad Alhawari, Baker Mohammad, Hani Saleh, Mohammed Ismail

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations

Abstract

This paper presents an area and power efficient multioutput switched capacitor (MOSC) DC-DC buck converter targeting ultra-low power and IoT devices. The MOSC converter has a variable input voltage range between 1.05V to 1.4V and generates regulated simultaneous multiple output voltage levels of 1V and 0.55V. Adaptive digital time multiplexing controller is employed to enable multiple power domains. In addition, a pulse frequency modulation is utilized to regulate the output voltages over a wide range of load current. The proposed converter supports a load current of 10μA to 350μA and to 10μA at a load voltage of 1V and 0.55V, respectively. Adaptive time multiplexing and pulse width modulation are implemented through a finite state machine to eliminate the reverse current issue. This problem arises during the switching from a low load voltage of 0.55V to a high load voltage of 1V. The MOSC circuit is fabricated in 65nm CMOS technology and it occupies an active area of 0.27mm2. Moreover, both MIM and MOS capacitors are utilized to further reduce the area of MOSC converter. Measured results shows that the peak efficiency of 78% is achieved at a load power of 300μW.

Original languageBritish English
Title of host publication2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538648810
DOIs
StatePublished - 26 Apr 2018
Event2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Florence, Italy
Duration: 27 May 201830 May 2018

Publication series

NameProceedings - IEEE International Symposium on Circuits and Systems
Volume2018-May
ISSN (Print)0271-4310

Conference

Conference2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
Country/TerritoryItaly
CityFlorence
Period27/05/1830/05/18

Keywords

  • multioutput switched capacitor buck converter and multiple output voltage levels
  • Power management unit

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