LTC4270

PRODUCTION

12-Port PoE/PoE+/LTPoE++ PSE Analog Controller

Data Sheet (Rev. E) Product Selection Table

Part Models: 6
1ku List Price: Starting From $10.67

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Part Details

12 Independent PSE Channels
Compliant with IEEE 802.3at Type 1 and 2
Chipset Provides Electrical Isolation
- Reduced BOM Cost
- Eliminates up to 6 High Speed Opto-Couplers
- Eliminates Isolated 3.3V Power Supply
Low Power Dissipation
- 0.25Ω Sense Resistance Per Channel
Very High Reliability 4-Point PD Detection
- 2-Point Forced Voltage
- 2-Point Forced Current

V_EE and V_PORT Monitoring
1 Second Rolling I_PORT Averaging
Supports 2-Pair and 4-Pair Output Power
1MHz I²C Compatible Serial Control Interface
Available In Three Power Grades
- A-Grade – LTPoE++^™ 38.7W to 90W
- B-Grade – PoE+ 25.5W
- C-Grade – PoE 13W
Available In 52-Lead 7mm × 8mm (LTC4270) and 24‑Lead 4mm × 4mm (LTC4271) QFN Packages

There is a newer version of this part available

12/24-Port IEEE 802.3bt 4-pair PoE PSE Digital Controller

Part Models: 6
1ku List Price: Starting From $10.67

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
LTC4270AIUKG#PBF	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4270AIUKG#TRPBF	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4270BIUKG#PBF	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4270BIUKG#TRPBF	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4270CIUKG#PBF	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4270CIUKG#TRPBF	52-Lead QFN (7mm x 8mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 29, 2022 - 22_0212 LTC4270 Datasheet Limit Change
		PCN22_0212_Form Material_Report Datasheet Specification Comparison
LTC4270AIUKG#PBF	PRODUCTION
LTC4270AIUKG#TRPBF	PRODUCTION
LTC4270BIUKG#PBF	PRODUCTION
LTC4270BIUKG#TRPBF	PRODUCTION
LTC4270CIUKG#PBF	PRODUCTION
LTC4270CIUKG#TRPBF	PRODUCTION
Aug 24, 2021 - 21_0168 LTC4270 Bond Wire Diameter Change from 1.3mil to 0.8mil
		PCN21_0168_Form Material_Report Qualification Results Summary
LTC4270AIUKG#PBF	PRODUCTION
LTC4270AIUKG#TRPBF	PRODUCTION
LTC4270BIUKG#PBF	PRODUCTION
LTC4270BIUKG#TRPBF	PRODUCTION
LTC4270CIUKG#PBF	PRODUCTION
LTC4270CIUKG#TRPBF	PRODUCTION
Jul 31, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC4270AIUKG#PBF	PRODUCTION
LTC4270AIUKG#TRPBF	PRODUCTION
LTC4270BIUKG#PBF	PRODUCTION
LTC4270BIUKG#TRPBF	PRODUCTION
LTC4270CIUKG#PBF	PRODUCTION
LTC4270CIUKG#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
I²C Isolators 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
PoE Powered Device (PD) 1
LT4275	PRODUCTION	LTPoE++/PoE+/PoE PD Controller

Parts	Product Life Cycle	Description
LTC9101-1	RECOMMENDED FOR NEW DESIGNS	48-Port IEEE 802.3bt PoE PSE Digital Controller
LTC9102	RECOMMENDED FOR NEW DESIGNS	12-Channel IEEE 802.3at/bt PoE PSE Analog Controller

Evaluation Kits

LTC4270B/LTC4271 Demo Board Kit | DC1680 + DC1682, 12-Port 25.5W PSE (Requires DC590)

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Product Details

Demonstration kit DC1840C is a 12-port Ethernet Alliance^™ certified IEEE 802.3at Type 2 power sourcing equipment (PSE) composed of a DC1682B daughter card and DC1680B mother board. The kit is used for evaluation of the LTC4270B and LTC4271 PSE chipset. Up to 12 powered devices (PDs) can be connected and powered from this system using a single power supply. A DC590 is connected to the DC1840 for I²C interfacing with QuikEval^™. This demonstration manual provides a Quick Start Procedure, a DC1682 overview, a DC1680 overview, schematics, and layout printouts.