LTC4267

PRODUCTION

Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator

Part Models: 8
1ku List Price: Starting From $2.17

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Overview

Complete Power Interface Port for IEEE 802^®.3af Powered Device (PD)
Onboard 100V, 400mA UVLO Switch
Precision Dual Level Inrush Current Limit
Integrated Current Mode Switching Regulator
Onboard 25kΩ Signature Resistor with Disable
Programmable Classiﬁcation Current (Class 0-4)
Thermal Overload Protection
Power Good Signal
Integrated Error Ampliﬁer and Voltage Reference
Low Proﬁle 16-Pin SSOP and 3mm × 5mm DFN Packages

The LTC4267 combines an IEEE 802.3af compliant Powered Device (PD) interface with a current mode switching regulator, providing a complete power solution for PD applications. The LTC4267 integrates the 25kΩ signature resistor, classiﬁcation current source, thermal overload protection, signature disable and power good signal along with an undervoltage lockout optimized for use with the IEEE-required diode bridge. The precision dual level input current limit allows the LTC4267 to charge large load capacitors and interface with legacy PoE systems.

The current mode switching regulator is designed for driving a 6V rated N-channel MOSFET and features programmable slope compensation, soft-start, and constant frequency operation, minimizing noise even with light loads. The LTC4267 includes an onboard error ampliﬁer and voltage reference allowing use in both isolated and nonisolated conﬁgurations.

The LTC4267 is available in space saving, low proﬁle 16-pin SSOP or DFN packages.

Applications

IP Phone Power Management
Wireless Access Points
Security Cameras
Power over Ethernet

Part Models: 8
1ku List Price: Starting From $2.17

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
LTC4267CDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4267CDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4267CGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4267CGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4267IDHC#PBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4267IDHC#TRPBF	16-Lead DFN (5mm x 3mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4267IGN#PBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4267IGN#TRPBF	16-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC4267CGN#PBF	PRODUCTION
LTC4267CGN#TRPBF	PRODUCTION
LTC4267IGN#PBF	PRODUCTION
LTC4267IGN#TRPBF	PRODUCTION
Apr 6, 2022 - 22_0066 Laser Top Mark for 16QSOP Assembled in ADPG [PNG]
		PCN22_0066_Form Material_Report Delta Qualification Matrix
LTC4267CGN#PBF	PRODUCTION
LTC4267CGN#TRPBF	PRODUCTION
LTC4267IGN#PBF	PRODUCTION
LTC4267IGN#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
Circuit Monitors 1
LT2940	PRODUCTION	Power and Current Monitor
Power-over-Ethernet (PoE) Controllers 1
LT4275	PRODUCTION	LTPoE++/PoE+/PoE PD Controller

Parts	Product Life Cycle	Description
LTC4267-1	PRODUCTION	Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC4267
LTC4267-1
LTC4267-3

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

LTC4267CDHC | PoE Powered Device with 12V Isolated Auxiliary, VOUT = 12V @ 0.9A

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Product Details

Demonstration circuit 1145B, featuring the LTC4267, provides a complete IEEE 802.3af Powered Device (PD) interface and isolated 12V at 0.9A power supply solution for use in Power over Ethernet (PoE) applications. An optional connection is included for a 12V auxiliary supply on the secondary side that disables PoE when present.

Resources

DC1145B - Design Files
8/16/2011

DC1145B - Demo Manual
7/26/2011

DC1145 - Schematic
9/24/2009

LTC4267CDHC | RJ-45 Ethernet Output, VOUT = 3.3V @ 1.0A

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Product Details

Demonstration circuit 804 is a Power over Ethernet PD Interface with Integrated Switching Regulator featuring the LTC4267. It provides a complete IEEE 802.3af power device (PD) interface and isolated 3.3V power supply solution for use in Power over Ethernet (PoE) applications.