Multi-Port PSE Controllers

The Si3459 and Si3454 devices are components of a complete Power Sourcing Equipment (PSE) solution, which includes Si8605 I2C isolators, an evaluation board and reference design, and a stand-alone power manager IC (Si3484) for rapid integration with Ethernet switch chipsets. This complete Silicon Labs solution provides customers with a one-stop-shop for their PSE subsystem and accelerates their time-to-market.  The Si3459 is a highly integrated, 8-port PoE and PSE controller, and the Si3454 is a 4-port controller. These products support both the original 15 W per port PoE standard, as well as the 30 W per port PoE+ standard.  

The Silicon Labs controllers enable the application of PoE power to Ethernet RJ45 jack ports, monitor power conditions, detect and deal with faults, detect valid Powered Devices (PDs), and cut off port power when connected PDs are removed. Each port’s supply voltage and current are measured and monitored in real-time and may be accessed via the I²C interface, enabling sophisticated system-level power management and control. 

Further, the companion power manager IC, Si3484, enhances system-level power management to include consumption-based policies, which permit smaller, less costly power supplies. The IC also enables supply failure monitoring for improved system robustness.   


  • Products add Power over Ethernet (PoE) capability to Ethernet switch designs
    • PoE for Enterprise, Small/Midsize business, service routers, IP PBXs
  • The included features set this family apart from many industry offerings
    • Ease of use and proven IEEE compliance
    • Logical programming interface
    • Integrated +3V power supply converter
    • Hosted or Autonomous operating modes
  • Any combination of port counts can be added to Ethernet switches
    • Available in both 8- and 4-port building blocks
  • 64-port Power Manager IC controls multiple PSE ICs from a system level
    • Offers increased port power consumption monitoring and control
    • Creates opportunity to downsize system power supplies

Get Started with Multi-Port PSE Controllers

Si3454/59 PSE Evaluation Kits

Ramp up power controller development with an 8-port, 16-port or 24-port Midspan Evaluation Kit.

View Kits

Multi-Port PSE Controllers Product Matrix

Part Number Data Sheet Evaluation Kit Description Temperature Range (ºC) Package Type Maximum Output Power (W)
Si3454-KIT QUAD 802.3at POE PSE controller -40 85 QFN38 30
Si3459-KIT OCTAL 802.3Aat POE PSE Controller -40 85 QFN56 30
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