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Resonant Converters

D24.3 - X-ReLA: A Family of Stacked-Ladder Charge-Cross-Converging ReSC with 98.2% Peak Efficiency Featuring Wide Voltage Conversion Ratio and Always Reduced Inductor Current

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
With the rapid advancement of AI computation, the ever-increasing power (>1 kW) in the low voltage domain limits the scaling down of high-Q inductors, which poses significant integration challenges for power conversion. In this paper, a family of cross-connected Stacked-Ladder resonant switched-capacitor converter (ReSC) topology (X-ReLA) reaches an optimal balance between switch loss and DCR loss with the proposed cross-phase charge converging technique. The 11V-to-1.8V two-phase prototype achieves 98.2% peak efficiency at 1 A. It maintains over 84% up to 9 A even with a 35-mΩ DCR, making it well-suited for high-performance computing (HPC) applications with stringent size requirements. Furthermore, the proposed X-ReLA achieves an extended voltage conversion ratio (VCR) via a flip-flop resonant tank.