LTC9101-2A

RECOMMENDED FOR NEW DESIGNS

12/24/48-Port IEEE 802.3at PoE PSE Digital Controller

Analog Devices LTC9101-2A Product Info

10 February 2026 6

Features

Fully Compliant IEEE 802.3at Type 1 and 2 PSE
Up to 48 PSE Ports
Industry-Standard Register Map
+80V/–20V Tolerant Port-Facing Pins
ECC-Protected eFlash and Data RAMs
Low Power Path Dissipation per Channel
- 100mΩ Sense Resistance
- 30mΩ or Lower MOSFET R_DS(ON)
Chipset Provides Electrical Isolation
- Eliminates Optos and Isolated 3.3V Supply

Very High Reliability Multipoint PD Detection
Continuous Per-Port Voltage and Current Monitoring
1MHz I²C Compatible Serial Control Interface
Pin or I²C Programmable PD Power
Available in 24-Lead 4mm × 4mm (LTC9101‑2A) and 64-Lead 7mm × 11mm (LTC9102) QFN Packages

Part details & applications

The LTC9101-2A/LTC9102 chipset is a (up to) 48-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 1 and 2 compliant Power over Ethernet (PoE) systems. The LTC9101-2A/LTC9102 is designed to power compliant 802.3af and 802.3at PDs. The LTC9101-2A/LTC9102 chipset delivers lowest-in-industry heat dissipation using low R_DS(ON) external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive optocouplers and a complex isolated 3.3V supply, resulting in significant bill of materials (BOM) cost savings.

Advanced power management features include per-port 14‑bit current/voltage monitoring, programmable current limits, and versatile fast shutdown of preselected ports. PD detection uses a proprietary multipoint detection mechanism, ensuring excellent immunity from false PD identification. 1-event and 2-event physical classification are supported. The LTC9101-2A/LTC9102 includes an I²C serial interface operable up to 1MHz. The LTC9101-2A/LTC9102 is pin or I²C programmable to negotiate PD-delivered power up to 25.5W.

APPLICATIONS

PoE PSE Switches/Routers and Midspans

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