LTC4266A
LTC4266C

RECOMMENDED FOR NEW DESIGNS

Quad PoE/PoE+/LTPoE++ PSE Controller

Data Sheet Product Selection Table

Part Models: 10
1ku List Price: Starting From $5.96

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Part Details

Four Independent PSE Channels
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

LTC4266A-1: LTPoE++^™ 38.7W
LTC4266A-2: LTPoE++ 52.7W
LTC4266A-3: LTPoE++ 70W
LTC4266A-4: LTPoE++ 90W
LTC4266C: PoE 13W

Available in 38-Lead 5mm × 7mm QFN Package

Part Models: 10
1ku List Price: Starting From $5.96

Documentation

Data Sheet 1

LTC4266A: Quad PoE/PoE+/LTPoE++ PSE Controller Data Sheet 07/13/2017

User Guide 1

DC1815A - Demo Manual 02/24/2016

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
LTC4266AIUHF-1#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266AIUHF-1#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266AIUHF-2#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266AIUHF-2#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266AIUHF-3#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266AIUHF-3#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266AIUHF-4#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266AIUHF-4#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266CIUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4266CIUHF#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
LTC4266AIUHF-1#PBF	PRODUCTION
LTC4266AIUHF-1#TRPBF	PRODUCTION
LTC4266AIUHF-2#PBF	PRODUCTION
LTC4266AIUHF-2#TRPBF	PRODUCTION
LTC4266AIUHF-3#PBF	PRODUCTION
LTC4266AIUHF-3#TRPBF	PRODUCTION
LTC4266AIUHF-4#PBF	PRODUCTION
LTC4266AIUHF-4#TRPBF	PRODUCTION
LTC4266CIUHF#PBF	PRODUCTION
LTC4266CIUHF#TRPBF	PRODUCTION
Nov 8, 2021 - 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
LTC4266AIUHF-1#PBF	PRODUCTION
LTC4266AIUHF-1#TRPBF	PRODUCTION
LTC4266AIUHF-2#PBF	PRODUCTION
LTC4266AIUHF-2#TRPBF	PRODUCTION
LTC4266AIUHF-3#PBF	PRODUCTION
LTC4266AIUHF-3#TRPBF	PRODUCTION
LTC4266AIUHF-4#PBF	PRODUCTION
LTC4266AIUHF-4#TRPBF	PRODUCTION
LTC4266CIUHF#PBF	PRODUCTION
LTC4266CIUHF#TRPBF	PRODUCTION

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

Software Resources

Evaluation Software 1

Software Interface Datasheet and Software

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.

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

Software Interface Datasheet and Software NEW

Hardware Ecosystem

Parts	Product Life Cycle	Description
I²C Isolators 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
PoE Powered Device (PD) 1
LT4275	RECOMMENDED FOR NEW DESIGNS	LTPoE++/PoE+/PoE PD Controller
Serial Bus Buffers, Extenders, and Accelerators 1
LTC4310	PRODUCTION	Hot-Swappable I²C Isolators
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Evaluation Kits

LTC4266A-4 Demo Board | 4-Port 90W LTPoE++ PSE (requires DC590)

Buy Now View Details

Product Details

Demonstration circuit 1815A features the LTC4266A quad 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 LTC4266A feature set is a superset of the popular LTC4266. 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

DC1815A - Demo Manual
961.00K

DC1815A - Schematic
96.00K

DC1815A - Design Files
1.00M

LTC4266A-3 Demo Board | 4-Port 70W LTPoE++ PSE (Requires DC590)

Buy Now View Details

Product Details

Demonstration circuit 1815A features the LTC4266A quad 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 LTC4266A feature set is a superset of the popular LTC4266. 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

DC1815A - Demo Manual
961.00K

DC1815A - Schematic
96.00K

DC1815A - Design Files
1.00M

LTC4266A-1 Demo Board | 4-Port 38.7W LTPoE++ PSE (Requires DC590)

Buy Now View Details

Product Details

Demonstration circuit 1815A features the LTC4266A quad 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 LTC4266A feature set is a superset of the popular LTC4266. 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

DC1815A - Demo Manual
961.00K

DC1815A - Schematic
96.00K

DC1815A - Design Files
1.00M

LTC4266A-2 Demo Board | 4-Port 52.7W LTPoE++ PSE (Requires DC590)

Buy Now View Details

Product Details

Demonstration circuit 1815A features the LTC4266A quad 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 LTC4266A feature set is a superset of the popular LTC4266. 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.