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

Saurabh Chaubey; Ramesh Harjani

doi:10.1109/CICC.2017.7993625

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

Saurabh Chaubey, Ramesh Harjani

Electrical and Computer Engineering

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

Abstract

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 (@ V_out=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 language	English (US)
Title of host publication	38th Annual Custom Integrated Circuits Conference
Subtitle of host publication	A Showcase for Integrated Circuit Design in Silicon Hills, CICC 2017
Publisher	Institute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)	9781509051915
DOIs	https://doi.org/10.1109/CICC.2017.7993625
State	Published - Jul 26 2017
Event	38th Annual Custom Integrated Circuits Conference, CICC 2017 - Austin, United States Duration: Apr 30 2017 → May 3 2017

Publication series

Name	Proceedings of the Custom Integrated Circuits Conference
Volume	2017-April
ISSN (Print)	0886-5930

Other

Other	38th Annual Custom Integrated Circuits Conference, CICC 2017
Country/Territory	United States
City	Austin
Period	4/30/17 → 5/3/17

Bibliographical note

Publisher Copyright:
© 2017 IEEE.

Keywords

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

Publisher link

10.1109/CICC.2017.7993625

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Chaubey, S., & Harjani, R. (2017). Fully tunable software defined DC-DC converter with 3000X output current & 4X output voltage ranges. In 38th Annual Custom Integrated Circuits Conference: A Showcase for Integrated Circuit Design in Silicon Hills, CICC 2017 [7993625] (Proceedings of the Custom Integrated Circuits Conference; Vol. 2017-April). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/CICC.2017.7993625

Fully tunable software defined DC-DC converter with 3000X output current & 4X output voltage ranges. / Chaubey, Saurabh; Harjani, Ramesh.

38th Annual Custom Integrated Circuits Conference: A Showcase for Integrated Circuit Design in Silicon Hills, CICC 2017. Institute of Electrical and Electronics Engineers Inc., 2017. 7993625 (Proceedings of the Custom Integrated Circuits Conference; Vol. 2017-April).

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

Chaubey, S & Harjani, R 2017, Fully tunable software defined DC-DC converter with 3000X output current & 4X output voltage ranges. in 38th Annual Custom Integrated Circuits Conference: A Showcase for Integrated Circuit Design in Silicon Hills, CICC 2017., 7993625, Proceedings of the Custom Integrated Circuits Conference, vol. 2017-April, Institute of Electrical and Electronics Engineers Inc., 38th Annual Custom Integrated Circuits Conference, CICC 2017, Austin, United States, 4/30/17. https://doi.org/10.1109/CICC.2017.7993625

Chaubey S, Harjani R. Fully tunable software defined DC-DC converter with 3000X output current & 4X output voltage ranges. In 38th Annual Custom Integrated Circuits Conference: A Showcase for Integrated Circuit Design in Silicon Hills, CICC 2017. Institute of Electrical and Electronics Engineers Inc. 2017. 7993625. (Proceedings of the Custom Integrated Circuits Conference). doi: 10.1109/CICC.2017.7993625

Chaubey, Saurabh ; Harjani, Ramesh. / Fully tunable software defined DC-DC converter with 3000X output current & 4X output voltage ranges. 38th Annual Custom Integrated Circuits Conference: A Showcase for Integrated Circuit Design in Silicon Hills, CICC 2017. Institute of Electrical and Electronics Engineers Inc., 2017. (Proceedings of the Custom Integrated Circuits Conference).

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AB - 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.

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

Abstract

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Keywords

Publisher link

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