Overview
Features and Benefits
- 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
- VEE and VPORT Monitoring
- 1 Second Rolling IPORT 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
Product Details
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-RDS(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
Product Categories
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (2)
Documentation & Resources
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R547 Reliability Data3/26/2018
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DC1843B Demo Manual (Rev. B)12/4/2015
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Power over Ethernet Solutions4/4/2017
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PoE PD Controllers6/22/2015
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LTPoE++ PSE Controllers6/10/2013
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Next Generation Power Over Ethernet6/22/2023 -
PoE++ Video Product Brief10/15/2018
Product Recommendations
LTC4290 Companion Parts
Recommended Suggested Temp Sensor
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC4290AIUJ#PBF | Material Declaration | Reliability Data | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | |
| LTC4290AIUJ#TRPBF | Material Declaration | Reliability Data | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | |
| LTC4290BIUJ#PBF | Material Declaration | Reliability Data | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | |
| LTC4290BIUJ#TRPBF | Material Declaration | Reliability Data | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | |
| LTC4290CIUJ#PBF | Material Declaration | Reliability Data | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | |
| LTC4290CIUJ#TRPBF | Material Declaration | Reliability Data | 40-Lead QFN (6mm x 6mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R547 Reliability Data |
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Sample & Buy
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Evaluation Boards
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.