The objective of this research is to develop high-voltage hybrid DC-DC converters with compact designs that achieve high power density for data center applications. The growing demand for non-isolated, high-voltage step-down converters that are energy-efficient and capable of supplying heavy load currents motivates this work. We focus on converter shrinking techniques to improve power density. First, we introduce a merged cross-connected double step-down (DSD) converter that enables high-frequency power delivery. Next, we present a dual-path hybrid Dickson (DPHD) converter, which reduces inductor RMS current and minimizes the need for external bootstrap capacitors, paving the way for higher current density. Finally, we compare these designs with existing solutions and propose two promising directions for future investigation: a Fibonacci hybrid converter and a 6S quadruple step-down (QSD) hybrid converter.