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SI3400 Scheda tecnica(PDF) 1 Page - Silicon Laboratories |
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SI3400 Scheda tecnica(HTML) 1 Page - Silicon Laboratories |
1 / 20 page Rev. 0.9 8/07 Copyright © 2007 by Silicon Laboratories Si3400/Si3401 This information applies to a product under development. Its characteristics and specifications are subject to change without notice. Si3400 Si3401 FULLY-INTEGRATED 802.3-COMPLIANT PD INTERFACE AND SWITCHING REGULATOR Features Applications Description 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. IEEE 802.3 standard-compliant solution, including pre-standard (legacy) PoE support Highly-integrated IC enables compact solution footprints Minimal external components Integrated diode bridges and transient surge suppressor Integrated switching regulator controller with on-chip power FET Integrated dual current-limited hotswap switch Support non-isolated and isolated switching topologies Comprehensive protection circuitry Transient overvoltage protection Undervoltage lockout Early power-loss indicator Thermal shutdown protection Foldback current limiting Programmable classification circuit Low-profile 5 x 5 mm 20-pin QFN Pb-Free and RoHS-compliant Voice over IP telephones and adapters Wireless access points Security cameras Point-of-sale terminals Internet appliances Network devices High power applications (Si3401) Notes: 1. Pin VSSA added on revisions CZ and higher. 2. Pin ISOSSFT added on revisions CZ and higher. Function available on revision E silicon. For Rev CZ, or to disable this feature on Revision E, tie this pin to VDD. Ordering Information: See Ordering Guide on page page 17. Pin Assignments 5x 5mm QFN (Top View) EROUT SSFT SP1 VPOSF CT1 ISOSSFT 2 VDD 56 7 8 9 10 15 16 20 19 18 17 1 2 3 4 11 12 13 14 VNEG (PAD) CT2 |
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