Suitable operation conditions for different 100V trench-based power MOSFETs in 48V-input synchronous buck converters

In this work a comparative analysis between different trench-based power MOSFETs is performed to optimize the efficiency and the robustness of 48V-input synchronous buck converters. Hence, gate-trench (GT), gate-drift-trench (GDT) and split-gate (SG) trench structures are investigated by measurements and mixed-mode simulations to determine their suitability at different load currents and frequencies. Moreover, in order to reduce the ringing effects, a co-integrated resistor is proposed to optimize the inherent RC snubber branch in a SG based solution.