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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