8.2 A Continuous-Input-Current Passive-Stacked Third-Order Buck Converter Achieving 0.7W/mm2 Power Density and 94% Peak Efficiency

The power density and efficiency of power-management integrated circuits (PMICs) is playing an increasingly important role in the miniaturization of modern computing platforms. Small inductors can be used to help miniaturize buck DCDC converters, however as noted in Fig. 8.2.1 (lower left), small in...

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Bibliographic Details
Main Authors: Abdulslam, Abdullah, Mercier, Patrick P.
Format: Conference Proceeding
Language:English
Subjects:
Buck converters
Capacitors
Density measurement
Inductors
Power system measurements
Switches
Voltage measurement
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Summary:The power density and efficiency of power-management integrated circuits (PMICs) is playing an increasingly important role in the miniaturization of modern computing platforms. Small inductors can be used to help miniaturize buck DCDC converters, however as noted in Fig. 8.2.1 (lower left), small inductors tend to have high DC resistance (DCR) - greater than a comparably-sized CMOS switch - such that they ultimately limit the achievable power density of miniaturized buck converters to \lt 0.4 W/mm^{2} when including the area of both the passives and the PMIC [1, 2]. While recent work in switched-capacitor (SC) converters has shown that high power density is achievable, it is only possible when employing exotic ultra-high-density capacitors and when operating over a small number of conversion ratios; increasing the number of ratios to support the needs of dynamic voltage scaling loads (e.g., 0.4 to 1.2V) alongside use of conventional capacitor technologies degrades power density to
ISSN:2376-8606
DOI:10.1109/ISSCC.2019.8662384