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

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

doi:10.1109/ISCAS.2018.8350979

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

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

Electrical Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

5 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 language	British English
Title of host publication	2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781538648810
DOIs	https://doi.org/10.1109/ISCAS.2018.8350979
State	Published - 26 Apr 2018
Event	2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Florence, Italy Duration: 27 May 2018 → 30 May 2018

Publication series

Name	Proceedings - IEEE International Symposium on Circuits and Systems
Volume	2018-May
ISSN (Print)	0271-4310

Conference

Conference	2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018
Country/Territory	Italy
City	Florence
Period	27/05/18 → 30/05/18

Keywords

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

Access to Document

10.1109/ISCAS.2018.8350979

Cite this

Kilani, D., Alhawari, M., Mohammad, B., Saleh, H., & Ismail, M. (2018). An Efficient and Small Area Multioutput Switched Capacitor Buck Converter for IoTs. In 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings Article 8350979 (Proceedings - IEEE International Symposium on Circuits and Systems; Vol. 2018-May). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCAS.2018.8350979

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title = "An Efficient and Small Area Multioutput Switched Capacitor Buck Converter for IoTs",

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.",

keywords = "multioutput switched capacitor buck converter and multiple output voltage levels, Power management unit",

author = "Dima Kilani and Mohammad Alhawari and Baker Mohammad and Hani Saleh and Mohammed Ismail",

note = "Funding Information: V. ACKNOWLEDGMENT This work was supported by the Mubadala-SRC Center of Excellence for Energy Efficient Electronic Systems research contract 2013-HJ2440. Publisher Copyright: {\textcopyright} 2018 IEEE.; 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 ; Conference date: 27-05-2018 Through 30-05-2018",

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doi = "10.1109/ISCAS.2018.8350979",

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Kilani, D, Alhawari, M, Mohammad, B , Saleh, H & Ismail, M 2018, An Efficient and Small Area Multioutput Switched Capacitor Buck Converter for IoTs. in 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings., 8350979, Proceedings - IEEE International Symposium on Circuits and Systems, vol. 2018-May, Institute of Electrical and Electronics Engineers Inc., 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018, Florence, Italy, 27/05/18. https://doi.org/10.1109/ISCAS.2018.8350979

An Efficient and Small Area Multioutput Switched Capacitor Buck Converter for IoTs. / Kilani, Dima; Alhawari, Mohammad; Mohammad, Baker et al.
2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings. Institute of Electrical and Electronics Engineers Inc., 2018. 8350979 (Proceedings - IEEE International Symposium on Circuits and Systems; Vol. 2018-May).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Kilani, Dima

AU - Alhawari, Mohammad

AU - Mohammad, Baker

AU - Saleh, Hani

AU - Ismail, Mohammed

N1 - Funding Information: V. ACKNOWLEDGMENT This work was supported by the Mubadala-SRC Center of Excellence for Energy Efficient Electronic Systems research contract 2013-HJ2440. Publisher Copyright: © 2018 IEEE.

PY - 2018/4/26

Y1 - 2018/4/26

N2 - 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.

AB - 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.

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KW - Power management unit

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DO - 10.1109/ISCAS.2018.8350979

M3 - Conference contribution

AN - SCOPUS:85057098000

T3 - Proceedings - IEEE International Symposium on Circuits and Systems

BT - 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings

PB - Institute of Electrical and Electronics Engineers Inc.

T2 - 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018

Y2 - 27 May 2018 through 30 May 2018

ER -

Kilani D, Alhawari M, Mohammad B , Saleh H, Ismail M. An Efficient and Small Area Multioutput Switched Capacitor Buck Converter for IoTs. In 2018 IEEE International Symposium on Circuits and Systems, ISCAS 2018 - Proceedings. Institute of Electrical and Electronics Engineers Inc. 2018. 8350979. (Proceedings - IEEE International Symposium on Circuits and Systems). doi: 10.1109/ISCAS.2018.8350979

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

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Keywords

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