@inproceedings{81711e99839d41229ddf82ef8552f943,
title = "A Merged-Two-Stage LEGO-PoL Converter with Coupled Inductors for Vertical Power Delivery",
abstract = "This paper presents a merged-two-stage hybrid-switched-capacitor converter featuring the Linearly Extendable Group Operated Point-of-Load (LEGO-PoL) architecture with coupled inductor-enabled vertical power delivery for ultra-high-current microprocessors. By merging a switched-capacitor stage with a multiphase buck converter stage, the proposed converter achieves reduced device stress, minimized magnetics size, and soft charging. A systematic way of designing coupled inductors in multiphase buck converters, based on an inductance dual model which links the geometry of the magnetic core to a lumped circuit model, is introduced. Coupled inductors in the multiphase buck stage reduce the steady-state per-phase current ripple and improve the transient performance of the system. By delivering power vertically from the motherboard to microprocessors, a high current and power density prototype is designed to minimize the parasitic resistance and enable fast transient with low output current ripple. A 48 V to 1.5 V LEGO-PoL converter rated to deliver 750 A of output current with 100 A/cm2 current area density and 1125 W with 1725 W/in3 power density is designed and simulated with customized four-phase coupled inductors.",
keywords = "Merged-two-stage, coupled inductor., hybrid converter, point-of-load converter, switched-capacitor",
author = "Youssef Elasser and Jaeil Baek and Minjie Chen",
note = "Publisher Copyright: {\textcopyright} 2020 IEEE.; 12th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2020 ; Conference date: 11-10-2020 Through 15-10-2020",
year = "2020",
month = oct,
day = "11",
doi = "10.1109/ECCE44975.2020.9236294",
language = "English (US)",
series = "ECCE 2020 - IEEE Energy Conversion Congress and Exposition",
publisher = "Institute of Electrical and Electronics Engineers Inc.",
pages = "916--923",
booktitle = "ECCE 2020 - IEEE Energy Conversion Congress and Exposition",
address = "United States",
}