The recent wireless sensing and emerging Internet-of-Thing (IoT) market has enabled the development of miniaturized systems with distinct application requirements. While highly efficient power management is mandatory to ensure the system performance and operation lifetime, on-chip inductive power converters generally exhibit increased manufacturing cost despite their higher achievable power densities. Due to the full integration capability with good adaptability, switched-capacitor (SC) DC-DC converters with multiple voltage conversion ratios (VCR) are promising candidates for ultra-compact on-chip IoT power solutions. However, existing fine-grained topologies typically suffer from the hard tradeoff between efficiency and power density due to the intrinsic operation and loss mechanisms.
This presentation will first cover the fundamentals of SC DC-DC converters, followed by the discussion of different reconfigurable topologies. Advanced algorithmic SC DC-DC converter topologies capable of systematic multiple VCR generation with both high efficiency and power density will be detailed. On-chip circuit implementation techniques for efficiency and power density optimization under wide voltage dynamics will also be introduced.