LTC4263-1 - High Power Single PSE Controller with Internal Switch


  • 30W PSE Output Power
  • IEEE 802.3af Compatible
  • Operation from a Single 56V Supply
  • Fully Autonomous Operation Without a Microcontroller
  • Internal MOSFET with Thermal Protection
  • Precision Inrush Control with Internal Sense Resistor
  • Forced Current PD Detection for Noise Immunity
  • AC and DC Disconnect Sensing
  • Legacy PD Detection
  • Robust Short-Circuit Protection
  • Pin-Selectable Detection Backoff for Midspan PSEs
  • LED Driver Indicates Port On and Blinks Status Codes
  • Available in a Miniature14-Pin 4mm × 3mm DFN Package

Typical Application

LTC4263-1 Typical Application


The LTC4263-1 is a high power, single PSE controller for use in Power over Ethernet systems. The internal current limit and short-circuit protection are designed to provide up to 30W of PSE output power for power hungry PoE applications such as WAPs, security cameras and RFID readers.

The LTC4263-1 includes IEEE 802.3af compliant PD detection circuitry along with selectable AC and DC disconnect sensing, allowing seamless operation in conventional IEEE 802.3af systems as well as propriety, high power applications. The LTC4263-1 simplifi es PSE implementation, needing only a single supply and a small number of passive support components. Onboard control algorithms provide complete PSE functionality without the need of a microcontroller and built-in foldback and thermal shutdown provide comprehensive fault protection. An LED pin indicates the state of the port and detection backoff timing is confi gurable for either endpoint or midspan operation.

The LTC4263-1 is available in a miniature 14-pin 4mm × 3mm DFN package.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC4263CDE-1#PBF 4x3 DFN-14 DE C 05-08-1708 Yes
LTC4263CDE-1#TRPBF 4x3 DFN-14 DE C 05-08-1708 Yes
LTC4263IDE-1#PBF 4x3 DFN-14 DE I 05-08-1708 Yes
LTC4263IDE-1#TRPBF 4x3 DFN-14 DE I 05-08-1708 Yes

LTC4263-1 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC4263CDE-1#PBF 4x3 DFN-14 C $4.21 $2.95 Yes
LTC4263CDE-1#TRPBF 4x3 DFN-14 C $3.01 Yes
LTC4263IDE-1#PBF 4x3 DFN-14 I $5.05 $3.54 Yes
LTC4263IDE-1#TRPBF 4x3 DFN-14 I $3.60 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


  • High Power Endpoint/Midspan PSEs
  • Single-Port or Multi-Port Power Injectors
  • Low Port Count PSEs
  • Environment B PSEs
  • Standalone PSEs

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