DESCRIPTION

The LTC?9101-3/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 I2Cbased

flash programming.

The LTC9101-3 autonomously performs compliant

802.3at detection, classification power up, power on, and

fault management.

FEATURES

- 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

- ECC-Protected eFlash and Data RAMs

- Very High Reliability Multipoint PD Detection

- Lowest Per-Port Power Path Dissipation

- 100mΩ Sense Resistance

- 57mΩ or Lower MOSFET RDS(ON)

- Chipset Isolation Eliminates Isolated 3.3V Supply

- Available in a 64-Lead 7mm × 11mm (LTC9103) and

24-Lead 4mm × 4mm (LTC9101-3) QFN Packages

APPLICATIONS

- Small Business PoE PSE Switches/Routers