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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 240

Supercapacitor-based power backup prevents data loss in RAID systems

Jim Drew

Abstract

A supercapacitor-based power backup system that prevents data loss in RAID systems is described.

Keywords

RAID system

backup power

supercapacitor charger

LTC3625

Introduction

Redundant arrays of independent disks, or RAID, systems by nature are designed to preserve data in the face of adverse circumstances. One example is power failure, thereby threatening data that is temporarily stored in volatile memory. To protect this data, many systems incorporate a battery-based power backup that supplies short-term power—enough watt-seconds for the RAID controller to write volatile data to nonvolatile memory. However, advances in flash memory ...

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