Vertical Stacked 48V-1V LEGO-PoL CPU Voltage Regulator with 1A/mm2Current Density

Youssef Elasser, Jaeil Baek, Kaladhar Radhakrishnan, Houle Gan, Jonathan Douglas, Harish K. Krishnamurthy, Xin Li, Shuai Jiang, Charles R. Sullivan, Minjie Chen

Research output: Contribution to conferencePaperpeer-review

5 Scopus citations

Abstract

This paper presents a 48 V-1 V merged-two-stage hybrid-switched-capacitor voltage regulator with a Linear Extendable Group Operated Point-of-Load (LEGO-PoL) architecture for high-current microprocessors, featuring vertical stacked packaging and coupled inductors. The architecture is highly modular and scalable. The switched-capacitor circuits are connected in series on the input side to split the high input voltage into multiple stacked voltage domains. The multiphase buck circuits are connected in parallel to distribute the high output current into multiple parallel current paths. A 780 A vertical stacked CPU voltage regulator with a peak efficiency of 91.1% and a full load efficiency of 79.2% at 1 V output voltage with liquid cooling is built and tested. This is the first demonstration of a 48 V-1 V CPU voltage regulator achieving over 1 A/mm2 current density and 1,000 W/in3 power density. The output voltage is regulated between 0.8 V and 1.5 V through the entire 780 A range.

Original languageEnglish (US)
Pages1259-1266
Number of pages8
DOIs
StatePublished - 2022
Event37th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2022 - Houston, United States
Duration: Mar 20 2022Mar 24 2022

Conference

Conference37th Annual IEEE Applied Power Electronics Conference and Exposition, APEC 2022
Country/TerritoryUnited States
CityHouston
Period3/20/223/24/22

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

Keywords

  • coupled inductor
  • dc-dc power conversion
  • hybrid switched-capacitor circuit
  • point-of-load
  • vertical power delivery
  • voltage regulator

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