D11.1 - Integrated 4-Level Dual-Phase Superimposed Quadratic Power Converter for High-Density Direct 48V/1V Conversion

Thursday, March 20, 2025

11:30 AM – 1:30 PM ET

Location: Level One, Hall A3

Technical Dialogue Presenter(s)

Prosenjit Ghosh, PhD

University of Texas at Dallas

Presentation Paper

Co-Author(s)

Jin Woong Kwak

The University of Texas at Dallas
DM

D. Brian Ma

University of Texas at Dallas
Fei Zhou (he/him/his)

The University of Texas at Dallas

Recent hybrid power converter topologies have encountered significant design and performance challenges for high step-down DC-DC power conversion. To minimize power passives and achieve high power density, both high switching frequency (fSW) operation and single-stage conversion are preferred; however, the resulting high step-down ratio imposes extremely short ON-time (TON), which limits the maximum achievable fSW. To address these, this paper presents a novel 4-level dual-phase superimposed quadratic (4-LDPSQ) converter topology, which significantly extends TON and enhances efficiency by reducing voltage stresses on switches and optimizing RMS currents with parallel multipath power delivery. A prototype of this work, designed in a 0.18μm HV-BCD process, demonstrates direct 48V-to-1V conversion with a maximum IO of 5A at 5MHz, a peak efficiency of 88.28%, and power density of 69mW/mm3, representing ×9.35 power density improvement and ×13.9 TON extension over a conventional half-bridge (HB) topology.