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