PoE+ Powered Device ICs with PD Interface and Switching Regulator

The Si3406x family of PoE+ Powered Devices ICs are the industry’s most highly-integrated, IEEE 802.3at Type 2-compliant, PoE PD interface and pulse-width-modulated (PWM) switching regulator ICs. By continuing industry leadership in device integration, lowest overall BOM cost, efficiency and reliability, the Si3406x family enables designers to easily add PoE+ functionality to their Ethernet products. When included in the design of a PoE-enabled system, such as an IP camera, wireless access point or VoIP phone, a Si3406x IC converts the high voltage (typically >48 V) supplied over Ethernet copper UTP cabling into a regulated, low-voltage dc supply. In addition, the Si3406x products combine all the required IEEE 802.3at Type 2 detection, classification and hot swap interfaces with a complete, high efficiency, PWM switching regulator. Silicon Labs’ Si3406x family of devices provide the industry’s greatest integration of high voltage discrete devices onto the PD chip, PoE+ power capability, flexible power conversion topology options with up to 90% efficiency, robust sleep/wake/LED support modes, and superior EMI performance aiding customers in creating cost-effective, high power, highly efficiency, and fast time to market PoE PD-powered solutions

The Si3406x family includes:

  • Si3406: the flagship PoE+ PD offering 
  • Si34061: Adds support for very high power applications and maximum efficiency
  • Si34062: Adds support for very low standby power applications including sleep and wake features


  • Supports non-isolated and isolated switching topologies
  • Fully integrated high-voltage devices
  • Two complete diode bridges
  • Transient voltage suppressor
  • Switching regulator driver FET
  • Current-limited hot swap switch
  • Comprehensive protection circuitry
  • Transient over-voltage protection
  • Under voltage lockout
  • Thermal shutdown protection
  • Fold back current limiting
  • Low-EMI slew rate control
  • Secondary sync FET driver
  • Type 2 present indicator
  • Automatic maintain power signature (MPS) support
  • PWM switching frequency control
  • Sleep mode control
  • External hotswap and switching FET modes (Si34061)
  • Auxiliary adapter power sense (Si34061)
  • Advanced Sleep/Wake modes with LED (Si34062)
  • Transformer winding efficiency enhancer (Si34061, 62)

Getting Started with PoE+ Devices

Si34061ISOC4 Evaluation Kit

Taking its cue from the world’s most highly integrated PD the Si3402, the Si34061 now also adds PoE+ (30W) IEEE 802.3at power capability, includes excellent power conversion efficiency, power transistor bypass modes for optimal thermal management at the highest power levels, and continues the tradition of a high degree of BOM integration in a full-solution PoE Powered Device IC.  The Si34061 makes it simple and cost-effective for customers to add PoE capability to any Ethernet powered device application.

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PoE+ Devices

Part Number Data Sheet Evaluation Kit Description IEEE Specification Maximum Output Power (W) Package Type Package Size (mm) Auto MPS Support Aux Adapter Support Transformer Bias Winding Input DCDC Efficiency (%) Sleep Mode Switching Frequency Range (kHz) Synchronous FET Driver Temperature Range (ºC)
Si3406FBC3-KIT PoE+ PD interface and high-efficiency switching pegulator 802.3 at Type 2 30 QFN20 5x5 Yes No No Yes 83 Basic 100 500 Yes -40 85
Si34061FB5VC4-KIT PoE+ PD interface and high-efficiency switching regulators with transistor bypass 802.3 at Type 2 30 QFN24 5x5 Yes Yes Yes Yes 90 Basic 100 500 Yes -40 85
PoE+ PD interface and high-efficiency switching regulators with sleep, wake, and LED drive 802.3 at Type 2 30 QFN24 5x5 Yes No Yes Yes 85 Advanced 100 500 Yes -40 85
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