Journal
IEEE TRANSACTIONS ON POWER ELECTRONICS
Volume 31, Issue 7, Pages 4984-4994Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2015.2478850
Keywords
Closed-loop systems; integrated converter; switched capacitor (SC) circuits
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The fully integrated switched capacitor voltage regulator comprises power cells distributed as a ring around the digital area to supply while the MIM capacitors are stacked above. Multiratio cells provide a wide output voltage range from 0.2 to 1.1 V with an input voltage of 1.8 V. A frequency modulation control loop is designed with proportional-integral control. Sampled-data modeling is used to derive the necessary transfer functions to build the control loop. A primarily test chip is fabricated in 28-nm FDSOI technology to evaluate the design. A power density of 310 mW/mm(2) is achieved at 72.5% peak efficiency with a silicon area overhead of 11.5%.
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