A Multiphase Switched-Capacitor Converter for Fully Integrated AMLED Microdisplay System
Jiang,Junmin1; Liu,Xun1; Ki,Wing Hung1; Mok,Philip K.T.1; Lu,Yan2
Source PublicationIEEE Transactions on Power Electronics
AbstractA fully integrated switched-capacitor (SC) dc-dc converter is designed for powering up an active-matrix light-emitting diode (AMLED) microdisplay system. The stacking-transistor technique with three voltage conversion ratios is utilized to handle the lithium-ion battery range of 2.6-4.2 V and to reduce the switching loss. A 101-phase interleaving scheme is adopted such that, first, output voltage ripple δ V-{O} is significantly reduced; second, no external output capacitor is needed; and, third, SC power-cells are physically cascaded to encircle the LED array and drivers to reduce conduction loss. Two test chips were designed in the 0.18-μm 1P6M CMOS technology. The first chip is a test chip comprising the SC converter only. The output voltage is 4.2 V, and the measured maximum δ V-{O} is 52 mV. The measured power density is 74.4 mW/mm, peak efficiency is 81%, and maximum output power is 258 mW. The second chip is a system chip integrating the SC converter with the AMLED array and drivers using flip-chip packaging. The converter delivers a maximum power of 216 mW with a 78% peak efficiency in the SC mode and a 91% peak efficiency in the linear regulator mode.
KeywordActive matrix active-matrix light-emitting diode (AMLED) battery-connected dc-dc converter LED driver microdisplays (μ-displays) multiphase interleaving switched-capacitor (SC) converter voltage regulator
URLView the original
Scopus ID2-s2.0-85080880269
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Cited Times [WOS]:5   [WOS Record]     [Related Records in WOS]
Document TypeJournal article
CollectionUniversity of Macau
Corresponding AuthorJiang,Junmin
Affiliation1.Department of Electronic and Computer Engineering,Hong Kong University of Science and Technology,Hong Kong,Hong Kong
2.State Key Laboratory of Analog and Mixed-Signal VLSI,University of Macau,Macao
Recommended Citation
GB/T 7714
Jiang,Junmin,Liu,Xun,Ki,Wing Hung,et al. A Multiphase Switched-Capacitor Converter for Fully Integrated AMLED Microdisplay System[J]. IEEE Transactions on Power Electronics,2020,35(6):6001-6011.
APA Jiang,Junmin,Liu,Xun,Ki,Wing Hung,Mok,Philip K.T.,&Lu,Yan.(2020).A Multiphase Switched-Capacitor Converter for Fully Integrated AMLED Microdisplay System.IEEE Transactions on Power Electronics,35(6),6001-6011.
MLA Jiang,Junmin,et al."A Multiphase Switched-Capacitor Converter for Fully Integrated AMLED Microdisplay System".IEEE Transactions on Power Electronics 35.6(2020):6001-6011.
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