LTC4274A
LTC4274C

PRODUCTION

Single PoE/PoE+/LTPoE++ PSE Controller

Data Sheet Product Selection Table

Part Models: 10
1ku List Price: Starting From $5.37

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Part Details

Compliant with IEEE 802.3at Type 1 and 2
Low Power Dissipation

0.25Ω Sense Resistance Per Channel

Very High Reliability 4-Point PD Detection

2-Point Forced Voltage
2-Point Forced Current

High Capacitance Legacy Device Detection
1MHz I²C Compatible Serial Control Interface
Midspan Backoff Timer
Supports 2-Pair and 4-Pair Output Power
Available in Multiple Power Grades
Available in 38-Lead 5mm × 7mm QFN Package

Part Models: 10
1ku List Price: Starting From $5.37

Documentation

Data Sheet 1

LTC4274A/LTC4274C: Single PoE/PoE+/LTPoE++ PSE Controller Data Sheet 07/17/2017

User Guide 1

DC1814A - Demo Manual 01/28/2016

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
LTC4274AIUHF-1#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274AIUHF-1#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274AIUHF-2#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274AIUHF-2#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274AIUHF-3#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274AIUHF-3#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274AIUHF-4#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274AIUHF-4#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274CIUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4274CIUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0017 Bond Wire Change from Gold to Copper
		PCN25_0017_Form Material_Report Qualification Results Summary
LTC4274AIUHF-1#PBF	PRODUCTION
LTC4274AIUHF-1#TRPBF	PRODUCTION
LTC4274AIUHF-2#PBF	PRODUCTION
LTC4274AIUHF-2#TRPBF	PRODUCTION
LTC4274AIUHF-3#PBF	PRODUCTION
LTC4274AIUHF-3#TRPBF	PRODUCTION
LTC4274AIUHF-4#PBF	PRODUCTION
LTC4274AIUHF-4#TRPBF	PRODUCTION
LTC4274CIUHF#PBF	PRODUCTION
LTC4274CIUHF#TRPBF	PRODUCTION
Dec 28, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC4274AIUHF-1#PBF	PRODUCTION
LTC4274AIUHF-1#TRPBF	PRODUCTION
LTC4274AIUHF-2#PBF	PRODUCTION
LTC4274AIUHF-2#TRPBF	PRODUCTION
LTC4274AIUHF-3#PBF	PRODUCTION
LTC4274AIUHF-3#TRPBF	PRODUCTION
LTC4274AIUHF-4#PBF	PRODUCTION
LTC4274AIUHF-4#TRPBF	PRODUCTION
LTC4274CIUHF#PBF	PRODUCTION
LTC4274CIUHF#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 LTPoE++ Semi-auto mode operation is available for the LTC4266A and may be applied to the LTC4274A; this software may be requested from the Software Request Form.

Software Request Form NEW

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
PoE Powered Device (PD) 1
LT4275	PRODUCTION	LTPoE++/PoE+/PoE PD Controller
Serial Bus Buffers, Extenders, and Accelerators 1
LTC4310	PRODUCTION	Hot-Swappable I²C Isolators

Parts	Product Life Cycle	Description
LTC4279	PRODUCTION	Single Port PoE/PoE+/LTPoE++ PSE Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4274

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

LTC4274A-4 Demo Board | LTPoE++ (90W) PSE

Buy Now View Details

Product Details

Demonstration circuit 1814A features the LTC4274A, single port power sourcing equipment (PSE) controller, capable of delivering up to 90W of LTPoE++^™ power to a compatible LTPoE++ powered device (PD). A proprietary detection/classification scheme allows mutual identification between an LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4274A feature set is a superset of the popular LTC4274. These PSE controllers utilize low R_ON external MOSFETs and 0.25Ω sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation.

Resources

DC1814A - Demo Manual
1/28/2016

DC1814A - Design Files
2/24/2016

DC1814A - Schematic
2/24/2016

LTC4274A-1 Demo Board | LTPoE++ (38.7W) PSE

Buy Now View Details

Product Details

Demonstration circuit 1814A features the LTC4274A, single port power sourcing equipment (PSE) controller, capable of delivering up to 90W of LTPoE++^™ power to a compatible LTPoE++ powered device (PD). A proprietary detection/classification scheme allows mutual identification between an LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4274A feature set is a superset of the popular LTC4274. These PSE controllers utilize low RON external MOSFETs and 0.25Ω sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation.

Resources

DC1814A - Demo Manual
1/28/2016

DC1814A - Design Files
2/24/2016

DC1814A - Schematic
2/24/2016

LTC4274A-3 Demo Board | LTPoE++ (70W) PSE

Buy Now View Details

Product Details

Resources

DC1814A - Demo Manual
1/28/2016

DC1814A - Design Files
2/24/2016

DC1814A - Schematic
2/24/2016

LTC4274A-2 Demo Board | LTPoE++ (52.7W) PSE

Buy Now View Details

Product Details

Demonstration circuit 1814A features the LTC4274A, single port power sourcing equipment (PSE) controller, capable of delivering up to 90W of LTPoE++^™ power to a compatible LTPoE++ powered device (PD). A proprietary detection/classification scheme allows mutual identification between an LTPoE++ PSE and LTPoE++ PD while remaining compatible and interoperable with existing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4274A feature set is a superset of the popular LTC4274. These PSE controllers utilize low RON external MOSFETs and 0.25Ω sense resistors which are especially important at the LTPoE++ current levels to maintain the lowest possible heat dissipation.