LTC9101-3

RECOMMENDED FOR NEW DESIGNS

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

Analog Devices LTC9101-3 Product Info

10 February 2026 4

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 R_DS(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

Part details & applications

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

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