8/16-Port IEEE 802.3at PoE PSE Digital Controller with Power Management and LED Control

The LTC9101-3/LTC9103 chipset is a 8/16-port power sourcing equipment (PSE) controller and power manager designed for use in IEEE 802.3at compliant Power over Ethernet (PoE) systems. The LTC9101-3 manages a user-defined system-level power budget across all ports. Port power is automatically assigned based on system power availability, initial physical classification and after power up, port dynamic power consumption.

The LTC9101-3 prioritizes port power by port number (port 1 is highest priority) and automatically removes power from lower priority ports to accommodate higher priority ports.

The LTC9101-3 features an interface to control an external serial LED driver. LED indications include Port On, Port Off, Port Power Denied, and Port Fault states. A Supply Overload LED indicates system power usage is near power limit or a port is being denied power.

The LTC9101-3 operates without a host present. Configuration is accomplished by pin settings and I2C-based flash programming.

The LTC9101-3 autonomously performs compliant 802.3at detection, classification power up, power on, and fault management.

APPLICATIONS

* Small Business PoE PSE Switches/Routers

* Fully Compliant IEEE 802.3at (Type 2) PSE

* Up to 16 PSE Ports

* Fully Autonomous System-Level Power Manager

* No Host Processor Required

* System-Level PoE LED Controller

* Per-Port Status and Fault LEDs

* Supply Overload LED with Hysteresis

* eFlash-Programmable System Settings

* Port- and System-Level Power Thresholds

* LED Mapping and Blink Rate

* Port Power Priority