LTC4267 - Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
Datasheet Documentation
Datasheet
Design Note
Reliability Data
Product Selector Card
LT Journal
Press Release
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Overview

Features

Typical Application

LTC4267 Typical Application

Description

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.

Packaging

5x3 DFN-16,SSOP-16

LTC4267 Package Drawing
LTC4267 Package Drawing
Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price
(1-99)		 Price
(1k)*
LTC4267CDHC#PBF DFN 16 C $2.92 $2.20
LTC4267CDHC#TRPBF DFN 16 C $2.30
LTC4267CDHC-3#PBF DFN 16 C $2.92 $2.20
LTC4267CDHC-3#TRPBF DFN 16 C $2.30
LTC4267CGN#PBF SSOP 16 C $2.75 $2.10
LTC4267CGN#TRPBF SSOP 16 C $2.16
LTC4267CGN-1#PBF SSOP 16 C $2.75 $2.10
LTC4267CGN-1#TRPBF SSOP 16 C $2.16
LTC4267CGN-3#PBF SSOP 16 C $2.75 $2.10
LTC4267CGN-3#TRPBF SSOP 16 C $2.16
LTC4267IDHC#PBF DFN 16 I $3.50 $2.65
LTC4267IDHC#TRPBF DFN 16 I $2.75
LTC4267IDHC-3#PBF DFN 16 I $3.50 $2.65
LTC4267IDHC-3#TRPBF DFN 16 I $2.75
LTC4267IGN#PBF SSOP 16 I $3.33 $2.55
LTC4267IGN#TRPBF SSOP 16 I $2.61
LTC4267IGN-1#PBF SSOP 16 I $3.33 $2.55
LTC4267IGN-1#TRPBF SSOP 16 I $2.61
LTC4267IGN-3#PBF SSOP 16 I $3.33 $2.55
LTC4267IGN-3#TRPBF SSOP 16 I $2.61
LTC4267CDHC DFN 16 C $5.84 $4.40
LTC4267CDHC#TR DFN 16 C $4.60
LTC4267CGN SSOP 16 C $5.50 $4.20
LTC4267CGN#TR SSOP 16 C $4.32
LTC4267IDHC DFN 16 I $7.00 $5.30
LTC4267IDHC#TR DFN 16 I $5.50
LTC4267IGN SSOP 16 I $6.66 $5.10
LTC4267IGN#TR SSOP 16 I $5.22
LTC4267CGN-3 SSOP 16 C $5.50 $4.20
LTC4267IGN-3 SSOP 16 I $6.66 $5.10
LTC4267CGN-3#TR SSOP 16 C $4.32
LTC4267IGN-3#TR SSOP 16 I $5.22
LTC4267CDHC-3 DFN 16 C $5.84 $4.40
LTC4267CDHC-3#TR DFN 16 C $4.60
LTC4267IDHC-3 DFN 16 I $7.00 $5.30
LTC4267IDHC-3#TR DFN 16 I $5.50
* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.


Part Number Description Price Documentation
DC1145B LTC4267CDHC | PoE Powered Device w/12V Isolated Auxiliary, Vout = 12V @ 0.9A $75.00
DC804B-A LTC4267CDHC | RJ-45 Ethernet Output, Vout = 3.3V @ 1.0A $75.00
DC859A LTC4267IDHC Triple-Output PD for PoE $75.00
DC917A LTC4267| PoE to 3.3V@2.6A Isolated $75.00