SI3400

Si3400 Si3401 F U L L Y -I N T E G R A T E D 8 0 2 . 3 - C O M P L I A N T P D I N T E R F A C E AND SWITCHING REGULATOR Features 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 Ordering Information: See Ordering Guide on page page 17. Pin Assignments 5 x 5 mm QFN (Top View) VPOSS 16 Applications Voice over IP telephones and adapters Wireless access points Security cameras Point-of-sale terminals Internet appliances Network devices High power applications (Si3401) 20 19 18 17 15 EROUT SSFT VDD 1 2 3 VSSA VSS2 VSS1 SWO FB 1 14 CT1 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 ...