Romanian Journal of Information Science and Technology (ROMJIST)

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ROMJIST is a publication of Romanian Academy,
Section for Information Science and Technology

Editor – in – Chief:
Academician Dan Dascalu

Secretariate (office):
Adriana Neagu
Adress for correspondence: romjist@nano-link.net (after 1st of January, 2019)

Editing of the printed version: Mihaela Marian (Publishing House of the Romanian Academy, Bucharest)

Technical editor
of the on-line version:
Lucian Milea (University POLITEHNICA of Bucharest)

Sponsors:
• National Institute for R & D
in Microtechnologies
(IMT Bucharest), www.imt.ro
• Association for Generic
and Industrial Technologies (ASTEGI), www.astegi.ro

ROMJIST Volume 22, No. 2, 2019, pp. 144-157, Paper no. 625/2019
 

Cosmin-Sorin Plesa, Marius Neag, Cristian Mihai Boianceanu
Design of Over-Temperature Protection for Switched-Capacitor DC-DC Converter Based on Electro-Thermal Simulations

ABSTRACT: This paper presents an over-temperature protection (OTP) circuit for a DC-DC converter based on switching capacitors (SC DC-DC). A two-steps design methodology was employed: a first-pass circuit was obtained by using standard, electrical-only simulations; next, electro-thermal simulations were employed to ascertain the best location of the thermal sensor and the resulting thermal coupling, thus allowing for the fine-tuning of the final circuit. The die temperature distribution was analyzed for two critical operational scenarios in order to identify the worst case and to provide design data for implementing a robust and precise OTP. The key electrical and electro-thermal simulation results are presented in some detail. Finally, results of measurement performed on the actual silicon are presented, to validate the design.

KEYWORDS: Over-temperature protection; switched-capacitor DC-DC converter; controlled charging current, thermal shutdown; electro-thermal simulations

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