The Si3474A-IM IEEE 802.3bt compliant PoE PSE Controller provides up to 90 W of power for four 4-pair Ethernet ports in a QFN56 package. The  Si3474A-IM  automatically detects valid Powered Devices (PDs), monitors for fault conditions, and cuts off port power when connected PDs are removed. Each port’s supply voltage and current are measured and monitored in real-time and may be accessed via the I²C interface, enabling sophisticated system-level power management and control. Fully autonomous operation is also supported. Uses industry standard 255 mΩ sense resistor.