1. Products
  2. Power Monitor, Control, and Protection
  3. Power-over-Ethernet (PoE) Interface Controllers
  4. PoE Power Sourcing Equipment (PSE)
  5. LTC4274

Data Sheet
JP
User Guides Rev. B
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Alternative Parts

LTC4279
LTC4279

Single Port PoE/PoE+/LTPoE++ PSE Controller

Overview

Features and Benefits

  • Compliant with IEEE 802.3at Type 1 and 2
  • 0.34Ω Total Channel Resistance
    • 130mW/Port at 600mA
  • Advanced Power Management
    • 8-Bit Programmable Current Limit (ILIM)
    • 7-Bit Programmable Overload Currents (ICUT)
    • Fast Shutdown
    • 14.5-Bit Port Current/Voltage Monitoring
    • 2-Event Classification
  • Very High Reliability 4-Point PD Detection
    • 2-Point Forced Voltage
    • 2-Point Forced Current
  • High Capacitance Legacy Device Detection
  • LTC4259A-1 and LTC4266 SW Compatible
  • 1MHz I2C Compatible Serial Control Interface
  • Midspan Backoff Timer
  • Supports Proprietary Power Levels Above 25W
  • Available in 38-Pin 5mm × 7mm QFN Package

Product Details

The LTC4274 is a single power sourcing equipment controller designed for use in IEEE 802.3 Type 1 and Type 2 (high power) compliant Power over Ethernet systems. External power MOSFETs enhance system reliability and minimize channel resistance, cutting power dissipation and eliminating the need for heatsinks even at Type 2 power levels. External power components also allow use at very high power levels while remaining otherwise compatible with the IEEE standard. 80V-rated port pins provide robust protection against external faults.

The LTC4274 includes advanced power management features, including current and voltage readback and programmable ICUT and ILIM thresholds. Available C libraries simplify software development; an optional AUTO pin mode provides fully IEEE-compliant standalone operation with no software required. Proprietary 4-point PD detection circuitry minimizes false PD detection while supporting legacy phone operation. Midspan operation is supported with built-in 2-event classification and backoff timing. Host communication is via a 1MHz I2C serial interface.

The LTC4274 is available in a 5mm × 7mm QFN package that significantly reduces board space compared with competing solutions.

Applications

  • PSE Switches/Routers
  • PSE Midspans

Product Categories

To request software programming documentation, please complete the Software Request Form.

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Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (2)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (1)
  • Product Selector Card (4)
  • Videos (2)
  • Press Releases (1)
    • Document Type

    Tools & Simulations

    LTspice

    LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

    LTspice

    Models for the following parts are available in LTspice:

    LTC4274

    Product Recommendations

    LTC4274 Companion Parts

    Recommended Related Parts

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

    Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
    LTC4274CUHF#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274CUHF#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274IUHF#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274IUHF#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    Wafer Fabrication Data R547 Reliability Data

    PCN-PDN Information

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    Select Model for PCN Information
    • LTC4274CUHF#PBF Production
    • LTC4274CUHF#TRPBF Production
    • LTC4274IUHF#PBF Production
    • LTC4274IUHF#TRPBF Production

    Support & Discussions

    LTC4274 Discussions

    RE: LTC4266 I2C register List
    9 week(s) ago in Power Management
    All LTC4274 Discussions
    LTC4274 Contact ADI Technical Support »
    LTC4274 Ask your question »
    LTC4274 Contact ADI Technical Support » LTC4274 Ask your question »

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    Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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