Class 3 15W Power over Ethernet (PoE) Powered Devices

Si3402 and Si3404 PoE Powered Devices are the most highly-integrated, IEEE 802.3at Type 1-compliant, PoE PD interface and pulse-width-modulated (PWM) switching regulator devices in the industry. Si3402 and Si3404 products set a new bar for device integration, lowest overall BOM cost, efficiency and reliability and enable quick addition of PoE functionality to Ethernet applications. When included in the design of a PoE-enabled system, such as a wireless access point or VoIP phone, Si3402 and Si3404 devices convert the high voltage (typically ±48 V) supplied over Ethernet copper UTP cabling into a regulated, low-voltage dc supply. Si3402 and Si3404 devices combine all the required IEEE 802.3 at Type 1 detection, classification and hot swap interfaces with a complete, high efficiency, PWM switching regulator.

Si3402-B is a pin-compatible replacement for the end-of-life Si3402-A. Existing customer products based on Si3402-A EVB reference designs can be readily re-used with minimal change to a few on-board components. Si3402 is a strong legacy device with long-term support, is available in a 5mm x 5mm QFN package and includes input diode bridges on chip. The newer Si3404 offers additional features in a compact 4mm x 4mm QFN package and does not include input diode bridges on-chip.

Package size
4x4 mm
Interface
Integrated dc dc converter

Class 3 15W Powered Devices Common Specs

  • Supports non-isolated and isolated switching topologies
  • Fully integrated high-voltage devices
  • Two complete diode bridges (Si3402)
  • Transient voltage suppressor
  • Switching regulator driver FET
  • Dual current-limited hot swap switch
  • Tunable switching frequency (Si3404)
  • Comprehensive protection circuitry
  • Transient over-voltage protection
  • Under voltage lockout
  • Thermal shutdown protection
  • Fold back current limiting
  • Low-EMI slew rate control
  • Transformer bias winding support (Si3404)
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Part Number Description IEEE Specification Maximum Output Power (W) Package Type Package Size (mm) Auto MPS Support Aux Adapter Support Transformer Bias Winding Input DC DC Efficiency (%) Sleep Mode Switching Frequency Range (kHz) Synchronous FET Driver Temperature Range (ºC)
IEEE 802.3af Type 1 PD interface with dc-dc converter 802.3at Type 1 15 QFN20 5x5 78 350 350 -40 85
IEEE 802.3af Type 1 PD interface with high efficiency dc-dc converter and compact footprint 802.3at Type 1 15 QFN20 4x4 80 100 500 -40 85

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