LTC4263

PRODUCTION

Single IEEE 802.3af Compliant PSE Controller with Internal Switch

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Overview

  • IEEE 802.3af Compliant
  • Operation from a Single 48V Supply
  • Fully Autonomous Operation without Microcontroller
  • Internal MOSFET with Thermal Protection
  • Power Management Works Across Multiple Ports with Simple RC Network
  • Precision Inrush Control with Internal Sense Resistor
  • Powered Device (PD) Detection and Classification
  • AC and DC Disconnect Sensing
  • Robust Short-Circuit Protection
  • Pin-Selectable Detection Back-off for Midspan PSEs
  • Classification Dependent ICUT Current Threshold
  • LED Driver Indicates Port On and Blinks Status Codes
  • Available in 14-Pin SO and 4mm × 3mm DFN Packages

The LTC4263 is an autonomous single-channel PSE controller for use in IEEE 802.3af compliant Power over Ethernet systems. It includes an on-board power MOSFET, internal inrush, current limit, and short-circuit control, IEEE 802.3af compliant PD detection and classification circuitry, and selectable AC or DC disconnect sensing. On-board control algorithms provide complete IEEE 802.3af compliant operation without the need of a microcontroller. The LTC4263 simplifies PSE implementation, needing only a single 48V supply and a small number of passive support components.

Programmable on-board power management circuitry permits multiple LTC4263s to allocate and share power in multi-port systems, allowing maximum utilization of the 48V power supply—all without the intervention of a host processor. The port current limit can be configured to automatically adjust to the detected PD class. Detection back-off timing is configurable for either Endpoint or Midspan operation. Built-in foldback and thermal protection provide comprehensive fault protection.

An LED pin indicates the state of the port controlled by the LTC4263. When run from a single 48V supply, the LED pin can operate as a simple switching current source to reduce power dissipation in the LED drive circuitry.

The LTC4263 is available in 14-pin 4mm × 3mm DFN and 14-pin SO packages.

Applications

  • IEEE 802.3af Compliant Endpoint/Midspan PSEs
  • Single-Port or Multi-Port Power Injectors
  • Power Forwarders
  • Low-Port Count PSEs
  • Environment B PSEs
  • Standalone PSEs
LTC4263
Single IEEE 802.3af Compliant PSE Controller with Internal Switch
Single-Port Fully Autonomous PSE Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 4

User Guide 1

Design Note 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power-over-Ethernet (PoE) Controllers 2
LTC4274A
LTC4274C
Single PoE/PoE+/LTPoE++ PSE Controller
LTC4274
PRODUCTION Single PoE+ PSE Controller
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Evaluation Kits

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DC981A/B

LTC4263 DC981A Midspan Demo Board with DC981B Endspan Plugin

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Product Details

DC981A/B: Demo Board for the LTC4263 Single IEEE 802.3af Compliant PSE Controller with Internal Switch.
DC981A/B
LTC4263 DC981A Midspan Demo Board with DC981B Endspan Plugin
DC981A-B Demo Board DC981A-B Demo Board DC981A-B Demo Board DC981A-B Demo Board DC981A-B Demo Board DC981A-981B Application Circuit DC981A-981B Application Circuit DC981A-981B Application Circuit DC981A-981B Application Circuit EA Certified 3

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