Fully integrated DC-DC converter and a 0.4V 32-bit CPU with timing-error prevention supplied from a prototype 1.55V Li-ion battery

Matthew Turnquist,Lauri Koskinen,Tanja Kallio,Jani Makipaa,Markus Hiienkari,Ruzica Jevtic,Elina Pohjalainen

doi:10.1109/vlsic.2015.7231307

Fully integrated DC-DC converter and a 0.4V 32-bit CPU with timing-error prevention supplied from a prototype 1.55V Li-ion battery

Matthew Turnquist, Lauri Koskinen + Show 5 more

https://doi.org/10.1109/vlsic.2015.7231307

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Publication Date: Jun 1, 2015

Citations: 11

Affiliation: Aalto University, University of Turku, Carlos III University of Madrid

#Battery's Discharge Curve #Battery's Discharge + Show 8 more

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Abstract

We introduce an ultra-low-energy system comprised of a prototype 1.55V Li-ion battery, fully integrated switched-capacitor (SC) DC-DC 3:1 converter, and a 32-bit RISC CPU with timing-error prevention (TEP). The DC-DC converter and CPU are manufactured in 28nm UTBB FD-SOI. The DC-DC converter uses the battery's flat discharge curve and low nominal voltage to achieve a peak efficiency of 85%. The CPU operates from 0.3V-0.5V and with energy as low as 4.9pJ/cyc. The battery, DC-DC converter, and CPU system is able to operate with an average energy of 8pJ/cyc over 95% of the battery's discharge curve in the temperature range of −20oC to 70oC.

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