LTC4271

Name: LTC4271
Brand: Analog Devices

PRODUCTION

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

Data Sheet (Rev. E) Product Selection Table

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Overview

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

Documentation

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

Software Resources

Evaluation Software 1

Software Interface Data Sheet and Software

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

Reference software for IEEE 802.3at Semi-auto mode operation is available for this PSE controller and may be requested from the Software Request Form.

Reference software for LTPoE++ Semi-auto mode operation is available for this PSE controller and may be requested from the Software Request Form.

Software Request Form

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Interface Transceivers 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
Power-over-Ethernet (PoE) Controllers 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.

Resources

DC1840C - Demo Manual (Rev.E)
6/1/2016

DC1840C - Schematic
6/1/2016

DC1840C - Design Files
10/17/2016

LTC4270/LTC4271 Layout Guide
9/16/2024

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.