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  5. LT4276

Data Sheet
PDF
JP
User Guides
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Overview

Features and Benefits

  • IEEE802.3af/at and LTPoE++™ 90W Powered Device (PD) with Forward/Flyback Controller
  • LT4276A Supports All of the Following Standards:
    • LTPoE++ 38.7W, 52.7W, 70W and 90W
    • IEEE 802.3at 25.5W Compliant
    • IEEE 802.3af up to 13W Compliant
  • LT4276B is IEEE 802.3at/af Compliant
  • LT4276C is IEEE 802.3af Compliant
  • Superior Surge Protection (100V Absolute Maximum)
  • Wide Junction Temperature Range (–40°C to 125°C)
  • Auxiliary Power Support as Low as 9V
  • No Opto-Isolator Required for Flyback Operation
  • External Hot Swap™ N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
  • >94% End-to-End Efficiency with LT4321 Ideal Bridge
  • Available in a 28-Lead 4mm × 5mm QFN Package

Product Details

The LT4276 is a pin-for-pin compatible family of IEEE 802.3 and LTPoE++ Powered Device (PD) controllers. It includes an isolated switching regulator controller capable of synchronous operation in both forward and flyback topologies with auxiliary power support.

The LT4276A employs the LTPoE++ classification scheme, receiving 38.7W, 52.7W, 70W or 90W of power at the PD RJ45 connector, and is backwards compatible with IEEE 802.3. The LT4276B is a fully 802.3at compliant, 25.5W Type 2 (PoE+) PD. The LT4276C is a fully 802.3af compliant, 13W Type 1 (PoE) PD.

The LT4276 supports both forward and flyback power supply topologies, configurable for a wide range of PoE applications. The flyback topology supports No-Opto feedback. Auxiliary input voltage can be accurately sensed with just a resistor divider connected to the AUX pin.

The LT4276 utilizes an external, low RDS(ON) N-channel MOSFET for the Hot Swap function, maximizing power delivery and efficiency, reducing heat dissipation, and easing the thermal design.

Applications

  • High Power Wireless Data Systems
  • Outdoor Security Camera Equipment
  • Commercial and Public Information Displays
  • High Temperature Applications

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Evaluation Kits (10)

Documentation & Resources

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  • Data Sheets (1)
  • Reliability Data (1)
  • User Guides (9)
  • Product Selector Card (3)
  • Technical Articles (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:

    LT4276A

    Product Recommendations

    LT4276 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
    LT4276AHUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276AHUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276AIUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276AIUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276BHUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276BHUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276BIUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276BIUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276CHUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276CHUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276CIUFD#PBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    LT4276CIUFD#TRPBF Material Declaration Reliability Data 28-Lead QFN (4mm x 5mm x 0.75mm w/ EP)
    Wafer Fabrication Data R572 Reliability Data

    PCN-PDN Information

    Select a model from the dropdown below to subscribe to PCN/PDN notifications and view past notifications as well.

    Select Model for PCN Information
    • LT4276AHUFD#PBF Production
    • LT4276AHUFD#TRPBF Production
    • LT4276AIUFD#PBF Production
    • LT4276AIUFD#TRPBF Production
    • LT4276BHUFD#PBF Production
    • LT4276BHUFD#TRPBF Production
    • LT4276BIUFD#PBF Production
    • LT4276BIUFD#TRPBF Production
    • LT4276CHUFD#PBF Production
    • LT4276CHUFD#TRPBF Production
    • LT4276CIUFD#PBF Production
    • LT4276CIUFD#TRPBF Production

    Support & Discussions

    LT4276 Discussions

    RE: Regarding MPS support of LT4295
    RE: Can the LT4295, LT4293, LT4275A and LT4276A handle dual-signature in PD applications?
    RE: What is the most elegant way to use the LTC4269-1 with an 30 V auxiliary supply?
    All LT4276 Discussions
    LT4276 Contact ADI Technical Support »
    LT4276 Ask your question »
    LT4276 Contact ADI Technical Support » LT4276 Ask your question »

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