LTC4290

PRODUCTION

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

Part Models: 6
1ku List Price: Starting From $8.31

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Overview

Eight 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 a 40-Lead 6mm × 6mm (LTC4290) and 24-Lead 4mm × 4mm (LTC4271) QFN Package

The LTC4290/LTC4271 chipset is an 8-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3at Type 1 and Type 2 (high power) compliant Power over Ethernet (PoE) systems. Transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply resulting in significant BOM cost savings. The LTC4290/LTC4271 chipset delivers lowest-in-industry heat dissipation by utilizing low-R_DS(ON) external MOSFETs and 0.25Ω sense resistors.

Advanced power management features include per-port 12-bit current monitoring ADCs, DAC-programmable current limit, and versatile fast shut-down of preselected ports. Advanced power management host software is available under a no-cost license. PD discovery uses a proprietary dual-mode 4-point detection mechanism ensuring excellent immunity from false PD detection. Midspan PSEs are supported with 2-event classification and a 2 second backoff timer. The LTC4290/LTC4271 includes an I²C serial interface operable up to 1MHz.

The LTC4290/LTC4271 is available in multiple power grades allowing delivered PD power up to 90W.

Applications

PoE PSE Switches/Routers
PoE PSE Midspans

There is a newer version of this part available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 $8.31

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
LTC4290AIUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4290AIUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4290BIUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4290BIUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4290CIUJ#PBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC4290CIUJ#TRPBF	40-Lead QFN (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Dec 28, 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
LTC4290AIUJ#PBF	PRODUCTION
LTC4290AIUJ#TRPBF	PRODUCTION
LTC4290BIUJ#PBF	PRODUCTION
LTC4290BIUJ#TRPBF	PRODUCTION
LTC4290CIUJ#PBF	PRODUCTION
LTC4290CIUJ#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
Analog to Digital Converters (ADCs) 1
LTC2990	RECOMMENDED FOR NEW DESIGNS	Quad I²C Voltage, Current and Temperature Monitor
Interface Transceivers & Isolators 1
LTM2883	PRODUCTION	SPI/Digital or I²C μModule Isolator with Adjustable ±12.5V and 5V Regulated Power
Power-over-Ethernet (PoE) Controllers 2
LT4275	PRODUCTION	LTPoE++/PoE+/PoE PD Controller
LTC4270	PRODUCTION	12-Port PoE/PoE+/LTPoE++ PSE Analog 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

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.