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Analog Circuit Design Volume Three by John Hamburger, Bob Dobkin

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Chapter 267

Simple battery circuit extends Power over Ethernet (PoE) peak current

Mark Gurries

Abstract

A simple battery circuit that extends Power over Ethernet (POE) peak current is described.

Keywords

Power over Ethernet

LTC4267

LTC4055

Introduction

Power over Ethernet (PoE) is a new development that allows for the delivery of power to Ethernet-based devices via standard Ethernet CAT5 cable, precluding the need for wall adapters or other external power sources. The PoE specification defines a hardware detection protocol where Power Sourcing Equipment (PSE) is able to identify PoE Powered Devices (PDs), thus allowing full backwards compatibility with non-PoE-aware (legacy) Ethernet devices. The PoE specification also sets an upper ...

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