LTC4274 Product Brief

2

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Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

© LINEAR TECHNOLOGY CORPORATION 2009

LT 1009 • PRINTED IN USA

BENEFITS

RELATED PARTS

INFO AND SAMPLES

■

Lowest Channel Resistance Eliminates Heat Sinks

■

First Fully IEEE 802.3at-Compliant Single PSE

■

Linear’s Experienced and Dedicated PoE Team

Linear Technology’s team provides timely technical

support and optimum performance at the lowest overall

cost with fastest time to market.

LTC4274 Voltage Probe During 2-Event Classification

PART NUMBER

PSE/PD

CHANNELS DESCRIPTION

PACKAGE

LTC4264

PD

1

Pre-Standard High Power PD PoE Interface Controller (35W)

4mm

× 3mm DFN-12

LTC4265

PD

1

IEEE 802.3at High Power PD PoE+ Interface Controller (25.5W)

4mm

× 3mm DFN-12

LTC4268-1

PD

1

Pre-Standard High Power PD PoE Interface Controller with Integrated Synchronous

Switching Regulator (35W)

7mm

× 4mm DFN-32

LTC4269-1

PD

1

IEEE 802.3at High Power PD PoE+ Interface Controller with Integrated Synchronous

No-Opto Flyback Switching Regulator (25.5W)

7mm

× 4mm DFN-32

LTC4269-2

PD

1

IEEE 802.3at High Power PD PoE+ Interface Controller with Integrated Synchronous

Forward Converter (25.5W)

7mm

× 4mm DFN-32

LTC4278

PD

1

IEEE 802.3at High Power PD PoE+ Interface Controller with Integrated Synchronous

No-Opto Flyback Switching Regulator (25.5W), 12V Auxiliary Support

7mm

× 4mm DFN-32

LTC4263-1

PSE

1

High Power IEEE 802.3af PSE Controller with Internal Switch

4mm

× 3mm DFN-14

SO-14

LTC4266

PSE

4

Supports IEEE 802.3at Type 1 and Type 2 PDs, 0.34Ω Channel Resistance, Advanced

Power Management, High Reliability 4-Point PD Detection, Legacy Capacitance Detect

5mm

× 7mm DFN-38

SSOP-36

TIME

PSE

VOLTAGE

CLASS EVENT #1

ON RANGE

CLASS RANGE

MARK RANGE

RESET RANGE

LAYER 2 CLASSIFICATION (DATA LAYER)

IS INTENDED FOR ENDPOINT PSEs. USES

LINK LAYER DISCOVERY PROTOCOL (LLDP)

LAYER 1 CLASSIFICATION

(POWER LAYER) IS INTENDED

FOR MIDSPANS.

TRANSITION TO ON RANGE

VIA CLASS EVENT #3

DETECT RANGE

CLASS EVENT #2

MARK EVENT #1

MARK EVENT #2

• Visit http://www.linear.com/contact/ or call 1-800-4-LINEAR to find contact information for the sales office or distributor

near you.

• Visit http://www.linear.com/poe for more information about PoE and PoE+ products.

LTC4274 Size Comparison