The SI3473B-IM from Skyworks Solutions is a 2-Pair Octal-Port Power Sourcing Equipment Controller IC that has been designed for use in end spans (switches) and midspans (injectors). It requires an input voltage of 50 - 57 V. This controller manages eight independent ports, each incorporating the necessary detection and classification features as per IEEE standards. It includes power under-voltage lockout, output current limit, short-circuit protection, and thermal overload detection. This controller offers autonomous operation or control via an I2C host interface and features emergency shutdown support with port priority control. It provides enhanced design flexibility with per-port current and voltage monitoring, multi-point detection, programmable power MOSFET gate drive control, and a configurable watchdog timer for failsafe operation. This controller features a maskable interrupt pin, ensuring reliable operation by alerting the host of various status and fault events. It is available in a surface-mount package that measures 8 x 8 mm and is ideal for power-over-ethernet (PoE) switches, IP phone systems, ruggedized and industrial switches, and multiport PoE injector applications.
