SI3480

Si3480 Si3480 POWER MANAGEMENT CONTROLLER Features  Enables use of a smaller power  Pin programmable for overall supply for a 4 or 8 port PoE power supply capacity, port system power level, port priority, and  Self-contained solution operates detection timing without the need for a host for  LED indication of port status and unmanaged operation overall power consumption No software required  20-pin Quad flat package No data isolation required (4x4 mm)  Fully compliant with IEEE 802.3 4x4 mm PCB footprint; RoHS clause 33 for Power over Ethernet compliant including the 802.3at amendment  Extended operating temperature for higher power (30 W category 2 range (–40 to +85 °C) ports) Description The Si3480 is a power manager intended for use with the Si3452 Power over Ethernet (PoE) controller. The Si3480 enables the use of a smaller, lower cost, and more efficiently-utilized power supply in an unmanaged PoE Power Sourcing Equipment (PSE) system. The Si3452 is capable of delivering over 30 W per port, which means that, in a typical 8-port system, a 240 W power supply would have to be used to avoid overload. Typically, not all ports are used at full power; so, a smaller power supply in the range of 30 to 150 W can be used along with the Si3480 power management controller. The Si3480 power management controller is pin programmed. The pins are used to set the power supply capacity, the number of low power (category 1, 15.4 W), and high power (categ...