1. Products
  2. Power Monitor, Control, and Protection
  3. Power-over-Ethernet (PoE) Interface Controllers
  4. PoE Powered Device (PD)
  5. LTC4268-1

Alternative Parts


Features and Benefits

  • Robust 35W PD Front End
  • IEEE 802.3af Compliant
  • Rugged 750mA Power MOSFET with Precision Dual Level Current Limit
  • High Performance Synchronous Flyback Controller
  • IEEE Isolation Obtained Without an Opto-Isolator
  • Adjustable Frequency from 50kHz to 250kHz
  • Tight Multi-Output Regulation with Load Compensation
  • On-board 25k Signature Resistor
  • Programmable Classification Current to 75mA
  • Complete Thermal and Over-Current Protection
  • Available in Compact 32-Pin 7mm × 4mm DFN Package

Product Details

The LTC4268-1 is an integrated Powered Device (PD) controller and switching regulator intended for IEEE 802.3af and high power PoE applications up to 35W. By including a precision dual current limit, the LTC4268-1 keeps inrush below IEEE 802.3af current limit levels to ensure interoperability success while enabling high power applications with a 750mA operational current limit.

The LTC4268-1 synchronous, current-mode, flyback controller generates multiple supply rails in a single conversion providing for the highest system efficiency while maintaining tight regulation across all outputs. The LTC4268-1 includes patented No-Opto feedback topology to provide full IEEE 802.3af isolation without the need of opto-isolator circuitry.

The oversized power path and high performance flyback controller of the LTC4268-1 combine to make the ultimate solution for power hungry PoE applications such as WAPs, PTZ security cameras, RFID readers and ultra-efficient 802.3af applications running near the 12.95W limit.

The LTC4268-1 is available in a space saving 32-pin DFN package.


  • VoIP Phones with Advanced Display Options
  • Dual-Radio Wireless Access Points
  • PTZ Security Cameras
  • RFID Readers
  • Industrial Controls
  • Magnetic Card Readers
  • High Power PoE Systems

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Product Recommendations

LTC4268-1 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
LTC4268CDKD-1#PBF Material Declaration Reliability Data 32-Lead DFN (7mm x 4mm w/ EP)
LTC4268CDKD-1#TRPBF Material Declaration Reliability Data 32-Lead DFN (7mm x 4mm w/ EP)
LTC4268IDKD-1#PBF Material Declaration Reliability Data 32-Lead DFN (7mm x 4mm w/ EP)
LTC4268IDKD-1#TRPBF Material Declaration Reliability Data 32-Lead DFN (7mm x 4mm w/ EP)
Wafer Fabrication Data R535 Reliability Data

Sample & Buy

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Buy Now Pricing

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List Pricing

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.