LTC9101-2B

RECOMMENDED FOR NEW DESIGNS

12/24/48-Port IEEE 802.3bt 2-pair PoE PSE Digital Controller

Analog Devices LTC9101-2B Product Info

10 February 2026 4

Features

Fully Compliant IEEE 802.3bt Type 3 2-Pair PSE
Up to 48 PSE Ports with One Power Channel per Port
+80V/–20V Tolerant Port-Facing Pins
ECC-Protected eFlash and Data RAMs
Industry-Leading Power Path Efficiency
- 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 Voltage, Temperature, and Current Monitoring
1MHz I²C Compatible Serial Control Interface
Pin or I²C Programmable PD Power
Available in a 24-Lead 4mm × 4mm (LTC9101-2B) and 64-Lead 7mm × 11mm (LTC9102) QFN Packages

Part details & applications

The LTC^®9101-2B/LTC9102 chipset is a 12-/24-/48-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt-compliant Type 3 2-pair Power over Ethernet (PoE) systems. The LTC9101-2B/LTC9102 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-2B/LTC9102 chipset delivers lowest-in-industry heat dissipation by utilizing low RDS(ON) external MOSFETs and 0.1Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and a complex isolated 3.3V supply, resulting in significant BOM cost savings.

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