This document introduces a supercapacitor-based UPS system that provides backup power during power failures to allow the RAID controller to write volatile data to nonvolatile storage.
The document details how supercapacitors can replace batteries in Redundant Array of Independent Disks (RAID) systems to protect volatile memory during power failures. It highlights the benefits of using supercapacitors, such as lower Equivalent Series Resistance (ESR), higher capacitance per unit volume, and improved environmental performance compared to traditional battery solutions.
The note provides a design example utilizing the LTC3625 supercapacitor charger, the LTC4412 PowerPath controller for automatic power crossover switching, and the LTM4616 dual output pModule DC/DC converter. It includes calculations for determining minimum capacitance requirements based on backup time and load power, as well as recharge time estimations.
The device features a programmable average charge current up to 1A.
The desired recharge time for the system is ten minutes.