LT4294

PRODUCTION

IEEE 802.3bt PD Interface Controller

Data Sheet (Rev. B) Product Selection Table

Part Models: 8
1ku List Price: Starting From $1.83

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Overview

IEEE 802.3af/at/bt Powered Device (PD) Controller
Supports Up to 71.3W PDs
5-Event Classification Sensing
Superior Surge Protection (100V Absolute Maximum)
Wide Junction Temperature Range (–40°C to 125°C)
Overtemperature Protection

Integrated Signature Resistor
External Hot Swap N-Channel MOSFET for Lowest Power Dissipation and Highest System Efficiency
Configurable Aux Power Support as Low as 9V
Easy Migration Between LTPoE++^® PDs and IEEE 802.3bt PDs
Pin Compatible with LT4275A/B/C
Available in 10-Lead MSOP and 3mm × 3mm DFN Packages

The LT4294 is an IEEE 802.3af/at/bt-compliant powered device (PD) interface controller. The T2P output indicates the number of classification events received during IEEE 802.3bt-compliant mutual identification and negotiation of available power.

The LT4294 utilizes an external, low R_DS(ON) N-channel hot swap MOSFET and supports the LT4320/LT4321 ideal diode bridges, to extend the end-to-end power delivery efficiency and eliminate costly heat sinks. The LT4294 also includes a power good output, onboard signature resistor, undervoltage lockout, and thermal protection. Start-up inrush current is adjustable with an external capacitor. Auxiliary power override is supported as low as 9V with the AUX pin.

The LT4294 can be configured to support all possible 802.3bt, 802.3at and 802.3af power levels with external component changes. Pin-for-pin compatibility with the LT4275 family of PD Interface Controllers enables easy migration between LTPoE++ PDs and IEEE 802.3bt-compliant PDs.

Applications

High Power Wireless Data Systems
Outdoor Security Camera Equipment
Commercial and Public Information Displays
High Temperature Industrial Applications

Part Models: 8
1ku List Price: Starting From $1.83

Documentation

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
LT4294HDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4294HDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4294HMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4294HMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4294IDD#PBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4294IDD#TRPBF	10-Lead DFN (3mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4294IMS#PBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT4294IMS#TRPBF	10-Lead MSOP	Material Declaration Reliablity Data Package Resources	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
LT4294HDD#PBF	PRODUCTION
LT4294HDD#TRPBF	PRODUCTION
LT4294HMS#PBF	PRODUCTION
LT4294HMS#TRPBF	PRODUCTION
LT4294IDD#PBF	PRODUCTION
LT4294IDD#TRPBF	PRODUCTION
LT4294IMS#PBF	PRODUCTION
LT4294IMS#TRPBF	PRODUCTION
Jun 5, 2024 - 24_0003 Epoxy Change from Henkel 8290 to 8290A for MSOP Package (2)
		PCN24_0003_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT4294HMS#PBF	PRODUCTION
LT4294HMS#TRPBF	PRODUCTION
LT4294IMS#PBF	PRODUCTION
LT4294IMS#TRPBF	PRODUCTION
Feb 4, 2020 - 20_0130 Laser Top Mark Conversion for 10-Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0130_Form Material_Report
LT4294HMS#PBF	PRODUCTION
LT4294HMS#TRPBF	PRODUCTION
LT4294IMS#PBF	PRODUCTION
LT4294IMS#TRPBF	PRODUCTION

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Power-over-Ethernet (PoE) Controllers 1
LT4321	RECOMMENDED FOR NEW DESIGNS	PoE Ideal Diode Bridge Controller
Protection Switches & Controllers 1
LT4320 LT4320-1		Ideal Diode Bridge Controller

Parts	Product Life Cycle	Description
LT4295	RECOMMENDED FOR NEW DESIGNS	IEEE 802.3bt PD Interface with Forward/Flyback Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT4294

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

LT4294/LT4321 Demo Board | PoE++ (71W/37V to 57V) PD and Ideal Diode Bridge

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Product Details

Demonstration circuit 2583 is an Ethernet Alliance^™ certified IEEE 802.3bt compliant Power over Ethernet (PoE) powered device (PD). It features the LT4294 PD interface controller and the LT4321 PoE ideal diode bridge controller.