1. Products
  2. Power Monitor, Control, and Protection
  3. Power-over-Ethernet (PoE) Interface Controllers
  4. PoE Power Sourcing Equipment (PSE)
  5. LTC9101-2


Features and Benefits

  • Fully Compliant IEEE 802.3bt Type 3 and 4 PSE
  • Up to 24 PSE Ports with Two Power Channels per Port
  • +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 RDS(ON)
  • Chipset Provides Electrical Isolation
    • Eliminates Optos and Isolated 3.3V Supply
  • Very High Reliability Multipoint PD Detection
    • Connection Check Distinguishes Single-Signature and Dual-Signature PDs
  • Continuous Per-Port Voltage and Current Monitoring
  • 1MHz I2C Compatible Serial Control Interface
  • Pin or I2C Programmable PD Power
  • Available in a 24-Lead 4mm × 4mm (LTC9101‑2) and 64-Lead 7mm × 11mm (LTC9102) QFN Packages

Product Details

The LTC®9101-2/LTC9102 chipset is a 12/24-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC9101-2/LTC9102 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC9101-2/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 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. An advanced power management host software layer is available. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC9101-2/LTC9102 includes an I2C serial interface operable up to 1MHz. The LTC9101-2/LTC9102 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.


  • PoE PSE Switches/Routers and Midspans
To request software programming documentation, please complete the Software Request Form.

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Software & Systems Requirements

Evaluation Software

Software Interface Datasheet

The software interface datasheet for this PSE may be requested from the Software Request Form (SRF). This datasheet describes the I2C interface and programming details for the respective PSE controller.

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC9101AUF-2#PBF Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
LTC9101AUF-2#TRPBF Material Declaration Reliability Data 24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)
Wafer Fabrication Data

Sample & Buy

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Buy Now Pricing

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List Pricing

(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


Lead Times

Please see the latest communication from our CCO regarding lead times.



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