SI3402-B

Si3402-B FULLY-INTEGRATED 802.3-COMPLIANT POE PD INTERFACE AND LOW-EMI SWITCHING REGULATOR Features  Pin-compatible replacement for the obsolete Si3402-A  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  Programmable classification circuit  Incorporates switcher EMIreduction techniques.  Supports non-isolated and isolated switching topologies  Comprehensive protection circuitry Transient overvoltage protection Undervoltage lockout Early power-loss indicator Thermal shutdown protection Foldback current limiting  Low-profile 5 x 5 mm 20-pin QFN  RoHS-compliant Applications  Voice over IP telephones and adapters  Wireless access points  Security cameras Description  Point-of-sale terminals  Internet appliances  Network devices  High power applications The Si3402 integrates all power management and control functions required in a Power-over-Ethernet (PoE) powered device (PD) application. The Si3402 converts the high voltage supplied over the 10/100/1000BASE-T Ethernet connection into a regulated, low-voltage output supply. The optimized architecture of the Si3402 minimizes the solution footprint, reduces external BOM cost, and enables the use of low-cost...