LTC9101-2B

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $2.78

Viewing:

Overview

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

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

Part Models: 2
1ku List Price: Starting From $2.78

Documentation

Data Sheet 1

LTC9101-2B/LTC9102: 24-/48-Port IEEE 802.3bt PoE PSE Controller Data Sheet (Rev.0) 01/21/2025

User Guide 1

UG-2131: Evaluating the LTC9101-2/LTC9101-2A/LTC9101-2B and LTC9102 48-Channel IEEE 802.3at/bt PSE (Rev.B) 01/21/2025

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 Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LTC9101AUF-2B#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC9101AUF-2B#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 1

Software Interface Data Sheet

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

Software Request Form

Can't find the software or driver you need?

Evaluation Kits

Evaluating the LTC9101-2/LTC9101-2A/LTC9101-2B and LTC9102 48-Channel IEEE 802.3at/bt PSE

Buy Now View Details

Product Details

The EVAL-LTC9101-2 is a 48-channel IEEE 802.3at/bt compliant power sourcing equipment (PSE). The EVAL-LTC9101-2 includes the DC3159A-C, DC3159A-D, or DC3159A-E daughter card, the DC3017A-B motherboard, and features the LTC9101-2/ LTC9101-2A/LTC9101-2B and LTC9102 chipset.

In the EVAL-LTC9101-2, the daughter card has a single LTC9101-2x digital controller, where X denotes either the LTC9101-2, LTC9101-2A, or the LTC9101-2B. The DC3159A-C has the LTC9101-2, the DC3159A-D daughter card has the LTC9101-2A and the DC3159A-E has the LTC9101-2B. The digital controller interfaces with four LTC9102 (12-channel) analog controllers for a total of 48 PSE channels.

The LTC9101-2x use a proprietary isolated data interface allowing the LTC9101-2x digital controller to directly connect to the host controller I²C interface and eliminating the need for costly optocouplers and an additional 3.3 V supply.

The EVAL-LTC9101-2 kit connects to up to twenty-four, 802.3af/at/bt PDs directly at each port for 4-pair power evaluation. This kit version can operate autonomously or with host control over I²C.

The EVAL-LTC9101-2A kit connects to up to forty-eight, 802.3af/at PDs with an Ethernet splitter for each two ports for 2-pair power evaluation. This kit version requires host control over I²C.

The EVAL-LTC9101-2B kit connects to up to forty-eight, 802.3af/at/bt PDs with an Ethernet splitter for each two ports for 2-pair power evaluation. This kit version can operate autonomously or with host control over I²C.

Indicator LEDs quickly show channel status for the 48 power channels. An optional on-board buck regulator provides 3.3 V from the V_EE supply for the digital circuity. This demonstration manual provides an EVAL-LTC9101-2 overview and quick start procedure.

Design files for this circuit board are available.