Power Managers

Offering many configurability options, the combination of the Silicon Labs Si3459 and Si3484 allows a product designer to effectively manage port power on a system-wide level, reducing power supply sizes and providing robust response to power supply failures.  Precision system power management is activated when the Si3459 is teamed with the Si3484 power management controller IC. While the Si3459 is capable of supporting stand-alone power management algorithms and I2C-based queries a designer has implemented on their host controller, the Si3484 offers a convenient way to implement power management without time-consuming algorithm development.  


  • Enables use of smaller power supplies for up to 64-port PoE systems with Si3459 PSE interface ICs
  • Can operate with or without a host
  • Configuration save capability
  • Pin-selectable SPI or UART interface
  • Pin-selectable UART data rate
  • Fully-compliant with IEEE 802.3-AT Types I and II
  • Supports classification-based and LLDP power negotiation
  • Supports individual port priority and port configuration
  • Supports Power supply status from up to 3 power supplies
  • 24-pin Quad flat pack package
  • 4 x 4 mm PCB footprint; RoHS complaint
  • Extended temperature operating range (–40 to +85 °C)

Get Started with Power Managers

Si3459 24-Port Midspan Evaluation Kit

Jumpstart development for the Si3484 PSE Power Management Controller with the 24-pin Midspan Evaluation Kit.

View Kit

Power Managers Product Matrix

Part Number Data Sheet Evaluation Kit Description Temperature Range (ºC) Package Type Maximum Output Power (W)
Si3459Smart24-KIT 64 Port PSE power manager IC -40 85 QFN24 30
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