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LTC4270/LTC427112-Port LTPoE++ PSEController Chipset

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What is LTPoE++?

LTPoE++ is a proprietary classification thatallows PDs to deliver up to 90W.

Interoperable and backward compatible with IEEE PoE

Uses one or two CAT-5 cables

Both PSE and PD controllers available

Standard PoE TypePD InputPower

UseablePower

PoE (IEEE 802.3af) Type 1 13W 11.25WPoE+ (IEEE 802.3at) Type 2 25W 22W

LTPoE++

LTPoE++ 35W 30W

LTPoE++ 45W 38.2W

LTPoE++ 70W 60.8W

LTPoE++ 90W 76.8W

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LTC4270/LTC4271: Isolated 12-Port LTPoE++PSE Controller Chipset

FEATURES:

Twelve Independent PSE Channels

Compliant with IEEE 802.3at Type 1 and 2

Chipset Provides Electrical Isolation

Eliminates up to 6 High Speed Optos

Eliminates Isolated 3.3V Power Supply

Low Power Dissipation

0.25 Sense Resistance Per Channel

Very High Reliability 4-Point PD Detection 2-Point Forced Voltage

2-Point Forced Current Solution Isolation LTPoE++ PoE+ PoE

Max

Delivered

Power

LTC4271/70A Integrated 90W

LTC4271/70B Integrated 25.5W

LTC4271/70C Integrated 13W

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Linear PSE Controller Benefits Summary

Low BOM Cost

Ultra Low Heat Dissipation

Advanced Power Management Hardware

Advanced Power Management Software

Robust Cable Discharge Protection

Linear Technology Experience

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Traditional PSE Schematic

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igh o t a ing ith LT 2 0/

In the LT 2 0/ , a $0.20 part replace

~$ orth of part

Inexpen i e Dual 00 A E-T

Data Tran former

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Use of Key External Components

External MOSFET + 0.25 ohm External RSENSE = Low Power Dissipation + High Reliability

80V Abs Max Pins

Cable Discharge

Protection Scheme

Lower Cost

More Protection

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Advanced Power Management H/W & S/W

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Cable Discharge Protection

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ForcedCurrent

Detection Forced

VoltageDetection

LTC PSE Detection Uses Dual Impedance- 4Points. No False Positives or Negatives

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Summary of Benefits

Very Rugged 4th generation PSE ICs

All Port pins 80V ABSMAX

Compare to Competition Sense and Gate pins (2V to

12V ABSMAX) 150 Million PSE ports deployed in the world

High Cable Discharge capability

(BOM options up to 6kV)

Field upgradable firmware Add features, solve problems future proof

Very competitive BOM cost

Eliminates ALL opto-couplers, isolated 3.3V supply

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LTC4272: Non-Isolated 12-Port LTPoE++ PSEController

FEATURES:

Twelve Independent PSE Channels

Traditional PSE Controller Configuration

Requires 3.3V Isolated Supply and Optos

Compliant with IEEE 802.3at Type 1 and 2

Small Footprint Single-Chip Solution

Low Power Dissipation

0.25 Sense Resistance Per Channel

Very High Reliability 4-Point PD Detection

2-Point Forced Voltage

2-Point Forced Current

68-Pin 7mm x 12mm QFN

Solution Isolation LTPoE++ PoE+ PoE PD Power

LTC4272A External 90W

LTC4272B External 25.5W

LTC4272C External 13W