LTC4271

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. E) Product Selection Table

Part Models: 2
1ku List Price: Starting From $3.61

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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

Part Models: 2
1ku List Price: Starting From $3.61

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
LTC4271IUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC4271IUF#TRPBF	24-Lead QFN (4mm x 4mm 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
LTC4271IUF#PBF	PRODUCTION
LTC4271IUF#TRPBF	PRODUCTION
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LTC4271IUF#PBF	PRODUCTION
LTC4271IUF#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

Evaluation Software 1

Software Interface Datasheet

The software interface datasheet for this PSE may be requested from the Software Request Form (SRF). This datasheet describes the I²C interface and programming details for the respective PSE controller.

Software Interface Datasheet

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	RECOMMENDED FOR NEW DESIGNS	LTPoE++/PoE+/PoE PD Controller

Parts	Product Life Cycle	Description
LTC9101-1	RECOMMENDED FOR NEW DESIGNS	48-Port IEEE802.3bt (PoE 2) PSE Digital Controller
LTC9102	RECOMMENDED FOR NEW DESIGNS	12/24-Port IEEE 802.3bt PoE PSE Controller

Evaluation Kits

LTC4290B/LTC4271: (DC1680 + DC1842) 8-Port 25.5W Demo Kit (requires DC590)

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Product Details

Demonstration kit DC1843B is an 8-port Ethernet Alliance^™ certified IEEE 802.3at Type 2 power sourcing equipment (PSE) composed of a DC1842B daughter card and DC1680B motherboard. The kit is used for evaluation of the LTC4290B and LTC4271 PSE chipset. Up to 8 powered devices (PDs) can be connected and powered from this system using a single power supply. A DC590 is connected to the DC1843 for I²C interfacing with QuikEval^™. This demonstration manual provides a Quick Start Procedure, a DC1842B overview, a DC1680B overview, schematics, and layout printouts. Refer to the Layout Guide for Demonstration Circuit 1842B when laying out the LTC4290B/LTC4271 circuit. Contact Analog Devices for this document.

The DC1842B has increased surge protection over the DC1842A. The DC1680B uses discrete Ethernet transformers while the DC1680A has an integrated 12-port RJ45 jack.

Resources

LTC4290/LTC4271 Layout Guide
1.25 M

DC1843B - Design Files
3.00M

DC1843B Demo Manual (Rev.B)
2.00M

DC1843B - Schematic
168.00K

Software

DC1843B GUI Install Files

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.