Stability and Design Limits of Hysteretic Current-mode Switched-inductor Converters

Emerging wireless microsystems rely on tiny batteries and intermittent energy-harvesting sources for energy and power. To sense, process, and report numerous events across extended periods, they often idle and wake to full-power conditions. Their power supplies must therefore be compact and efficien...

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Bibliographic Details
Published in:Journal of semiconductor technology and science 2019, 19(4), 88, pp.321-326
Main Authors: Solis, Carlos J., Rincón-Mora, Gabriel A.
Format: Article
Language:English
Subjects:
전기공학
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Summary:Emerging wireless microsystems rely on tiny batteries and intermittent energy-harvesting sources for energy and power. To sense, process, and report numerous events across extended periods, they often idle and wake to full-power conditions. Their power supplies must therefore be compact and efficient and respond quickly to sudden wide load changes. Hysteretic current-mode switched-inductor dc–dc converters are good for this application space because they are compact, efficient, and fast. Although also widely stable, they are nevertheless subject to instabilities. This paper explains how input and output voltages and load dumps limit stability, and as a result, bandwidth and response time. Measurements of a 200-mA, 1-V, 0.18-μm CMOS hysteretic current-mode buck with 95% peak power-conversion efficiency show how increasing the load-dump step by 140 mA and decreasing the input voltage by 400 mV compromise stability. KCI Citation Count: 0
ISSN:1598-1657
2233-4866
DOI:10.5573/JSTS.2019.19.4.321