1. Products
  2. Power Monitor, Control, and Protection
  3. Power-over-Ethernet (PoE) Interface Controllers
  4. PoE Power Sourcing Equipment (PSE)
  5. LTC4274A/LTC4274C

Data Sheet
JP
User Guides
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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
  • Low Power Dissipation
    • 0.25Ω Sense Resistance Per Channel
  • Very High Reliability 4-Point PD Detection
    • 2-Point Forced Voltage
    • 2-Point Forced Current
  • High Capacitance Legacy Device Detection
  • 1MHz I2C Compatible Serial Control Interface
  • Midspan Backoff Timer
  • Supports 2-Pair and 4-Pair Output Power
  • Available in Multiple Power Grades
  • Available in 38-Lead 5mm × 7mm QFN Package

Product Details

The LTC4274A is a single Power Sourcing Equipment (PSE) controller capable of delivering up to 90W of LTPoE++ power to a compatible LTPoE++ Powered Device (PD). A proprietary detection/classification scheme allows mutual identification between a LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4274A feature set is a superset of the popular LTC4274. These PSE controllers feature low-RON external MOSFETs and 0.25Ω sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation.

The LTC4274C targets fully automatic PSE systems powering Type 1 (up to 13W) PDs.

Advanced power management features include: a 14-bit current monitoring ADC, DAC-programmable current limit, and versatile quick port shutdown. PD Discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. The LTC4274A/LTC4274C includes an I2C serial interface operable up to 1MHz.

The LTC4274A/LTC4274C is available in multiple power grades, allowing delivered PD power of 13W, 25.5W, 38.7W, 52.7W, 70W and 90W. These controllers are available in a 38-lead 5mm × 7mm QFN package.

Applications

  • LTPoE++ PSE Switches/Routers
  • LTPoE++ PSE Midspans
  • IEEE 802.3at Type 1 PSE Switches/Routers
  • IEEE 802.3at Type 1 PSE Midspans

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Evaluation Kits (5)

Documentation & Resources

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  • Data Sheets (1)
  • User Guides (1)
  • Product Selector Card (3)
  • Videos (1)
  • Press Releases (1)
    • Document Type

    Tools & Simulations

    LTspice

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    LTC4274

    Product Recommendations

    LTC4274A_C 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
    LTC4274AIUHF-1#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274AIUHF-1#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274AIUHF-2#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274AIUHF-2#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274AIUHF-3#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274AIUHF-3#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274AIUHF-4#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274AIUHF-4#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274CIUHF#PBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    LTC4274CIUHF#TRPBF Material Declaration Reliability Data 38-Lead QFN (5mm x 7mm w/ EP)
    Wafer Fabrication Data

    PCN-PDN Information

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    Select Model for PCN Information
    • LTC4274AIUHF-1#PBF Production
    • LTC4274AIUHF-1#TRPBF Production
    • LTC4274AIUHF-2#PBF Production
    • LTC4274AIUHF-2#TRPBF Production
    • LTC4274AIUHF-3#PBF Production
    • LTC4274AIUHF-3#TRPBF Production
    • LTC4274AIUHF-4#PBF Production
    • LTC4274AIUHF-4#TRPBF Production
    • LTC4274CIUHF#PBF Production
    • LTC4274CIUHF#TRPBF Production

    Support & Discussions

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