64-Port PoE Power Management Controller

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Lead Time 52 weeks
Unit Price:$2.79
Minumum Qty: 1500
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Product Information

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The Si3484 is a power manager intended for use with the Si3459 Power over Ethernet (PoE) Power Sourcing Equipment (PSE) controllers for power management of up to 64 ports with three power sources.

The Si3459 is capable of delivering over 30 W per port, which means that, in a 24- or 48-port system, a very large power supply would have to be used to avoid overload. Typically, not all ports are used at full power; so, a smaller power supply can be used along with the Si3484 power management controller.

Use of the Si3484 power manager greatly simplifies system implementation of power management. The Si3484 power management controller is programmed via a SPI or UART interface to set the system power supply capacity, the port power configuration (Type 1: 15.4 W, or high-power Type 2: 30 W) ports, the port priority, the detection timing (Alternative A or Alternative B), and the fault recovery protocol. Once programmed, the configuration data can be saved, and the Si3484 can work without host intervention. Port and overall status information is available and continuously updated.

The Si3484 uses the real-time overload and current monitoring capability of the Si3459 to manage power shared among up to 64 ports. Power management is selectable between grant-based or consumption-based algorithms in order to supply power to the greatest number of ports.

In high-reliability systems, multiple power supplies are often connected to provide redundancy, which further increases the power supply monitoring requirements. The Si3484 can manage up to three power supplies automatically, enabling or disabling ports in priority order.

• Power over Ethernet Endpoint switches and Midspans
• Supports high-power PDs, such as:
- Pan/Tilt/Zoom security cameras
- Wireless Access Points
- Security and RFID systems
• Industrial automation systems
• Networked audio
• IP Phone Systems and iPBXs

Symmetry Electronics is an authorized Silicon Labs distributor.


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Enables use of smaller power supplies for up to 64-port PoE systems with Si3459 and Si3454 PSE Controller ICs
Can operate with or without a host
Configuration save capability
Pin-selectable SPI or UART interface
Pin-selectable UART data rate
Fully-compliant with IEEE 802.3-AT Types I and II
Supports classification-based and LLDP power negotiation
Supports individual port priority and port configuration
Supports Power supply status from up to 3 power supplies
24-pin Quad flat pack package
- 4x4 mm PCB footprint; RoHS complaint
Extended temperature operating range (40 to +85 C)

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