FULLY-INTEGRATED 802.3-COMPLIANT PD INTERFACE AND SWITCHING REGULATOR

The SI3400 and SI3401 integrate all Power Management and control functions required in a Power-over-Ethernet (PoE) powered device (PD) application. The SI3400 and SI3401 convert the high voltage supplied over the 10/100/1000BASE-T Ethernet connection into a regulated, low-voltage output supply. The optimized architectures of the SI3400 and SI3401 minimize the solution footprint, reduce external BOM cost, and enable the use of low-cost external components while maintaining high performance. The SI3400 and SI3401 integrate the required Diode bridges and transient surge suppressors, thus enabling direct connection of ICs to the Ethernet RJ-45 connector. The switching power FET and all associated functions are also integrated. The integrated Switching Regulator supports isolated (flyback) and non-isolated (buck) converter topologies. The SI3400 and SI3401 support IEEE STD 802.3-2005 (future instances are referred to as 802.3) compliant solutions as well as pre-standard products, all in a single IC. Standard external resistors connected to the SI3400 and SI3401 provide the proper 802.3 signatures for the detection function and programming of the classification mode. Startup circuits ensure well-controlled initial operation of both the hotswap Switch and the voltage Regulator The SI3400 and SI3401 are available in low-profile, 20-pin, 5 x 5 mm QFN packages. While the SI3400 is designed for applications up to 10 W, the SI3401 is optimized for higher power applications (up to approximately 15 W). See also AN313: Using the SI3400 01 in High Power Applications for more information. By Silicon Laboratories
Part Manufacturer Description Datasheet Samples
FA2732- Coilcraft Inc PoE transformer, for Si3400, SMT, RoHS
FA2924- Coilcraft Inc PoE transformer, for Si3400/3401, SMT, RoHS
FA2672- Coilcraft Inc PoE transformer, for Si3400, SMT, RoHS
FA2671- Coilcraft Inc PoE transformer, for Si3400, SMT, RoHS
FA2805- Coilcraft Inc PoE transformer, for Si3400/3401, SMT, RoHS
FA2925- Coilcraft Inc PoE transformer, for Si3400/3401, SMT, RoHS
SI3400 's PackagesSI3400 's pdf datasheet
SI3400-X-GM
SI3401-X-GM
SI3401




SI3400 Pinout, Pinouts
SI3400 pinout,Pin out
This is one package pinout of SI3400,If you need more pinouts please download SI3400's pdf datasheet.

SI3400 Application circuits
SI3400 circuits
This is one application circuit of SI3400,If you need more circuits,please download SI3400's pdf datasheet.


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SI3400 Pb-Free SI3400 Cross Reference SI3400 Schematic SI3400 Distributor
SI3400 Application Notes SI3400 RoHS SI3400 Circuits SI3400 footprint