LTC9101-2A

Name: LTC9101-2A
Brand: Analog Devices
Price: 3.52 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.52

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Overview

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 Models: 2
1ku List Price: Starting From $3.52

Documentation

Data Sheet 1

LTC9101-2A/LTC9102: 12-/24-/48-Port IEEE 802.3 at PoE PSE Controller Data Sheet (Rev.0) 07/26/2023

User Guide 1

UG-2131: Evaluating the LTC9101-2/LTC9101-2A/LTC9101-2B and LTC9102 48-Channel IEEE 802.3at/bt PSE (Rev.C) 12/05/2025

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-2A#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LTC9101AUF-2A#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Sep 19, 2024 - 24_0142 LTC9101- Wire Diameter and Bond Composition Change
		PCN24_0142_Form Material_Report
LTC9101AUF-2A#PBF	PRODUCTION
LTC9101AUF-2A#TRPBF	PRODUCTION

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

Software Resources

Evaluation Software 1

Software Interface Data Sheet and Software

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.

Reference software for IEEE 802.3bt Semi-auto mode operation is available for this PSE controller and may be requested from the Software Request Form.

Software Interface Data Sheet and Software

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Switching Regulators & Controllers 4
LTC3639	RECOMMENDED FOR NEW DESIGNS	High Efficiency, 150V 100mA Synchronous Step-Down Regulator
LT8304 LT8304-1		100V_IN Micropower No-Opto Isolated Flyback Converter with 150V/2A Switch
LT8310	PRODUCTION	100V_IN Forward Converter Controller
LT3748	PRODUCTION	100V Isolated Flyback Controller

Evaluation Kits

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

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Product Details

The EVAL-LTC9101-2 is an Ethernet Alliance certified, 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 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 is Ethernet Alliance Gen 2, Class 8 certified; and 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 is Ethernet Alliance Gen 1, Class 4 certified; and 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 requires host control over I²C.

The EVAL-LTC9101-2B kit is Ethernet Alliance Gen 2, Class 4 certified; and 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 at https://www.analog.com/EVAL-LTC9101-2.