Journal
IEEE JOURNAL OF SOLID-STATE CIRCUITS
Volume 50, Issue 12, Pages 2861-2869Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSSC.2015.2462351
Keywords
DC-DC converter; integrated voltage regulator; resonant switched capacitor; switched capacitor
Categories
Funding
- National Science Foundation [1309905]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1309905] Funding Source: National Science Foundation
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In recent years, there has been a push towards high-density and monolithic DC-DC converters to support applications such as performance and mobile computing, consumer electronics, and renewable energy. Switched capacitor (SC) converters have started to gain traction for a number of these applications, but are still subject to fundamental limitations that drive them towards expensive process options and high switching frequencies. Variable regulation is challenging with the SC approach, and comes at the cost of lower power density and efficiency. This work presents a resonant switched capacitor (ReSC) topology that addresses some of these challenges by introducing a small amount of inductance in series with the flying capacitor, eliminating charge-sharing losses and thus allowing efficient operation in a low-cost process option. The three-phase interleaved topology can deliver up to 7.7 W at 85% efficiency (power density of 0.91 W/mm(2) or 6.4 kW/in(3)) using a bootstrapped n-channel power train and single-digit nH inductors embedded in a flip-chip assembly. We also present the first implementation of efficient, fully-variable conversion ratios in a silicon ReSC integrated circuit without reconfiguration or gain-hopping.
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