LTC4290/LTC4271 - 8-Port PoE/PoE+/LTPoE++ PSE Controller

The LTC®4290/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.

  • 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
Typical Application

  • PoE PSE Switches/Routers
  • PoE PSE Midspans

Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LTC4290AIUJ#PBF6x6 QFN-40I$11.43$8.00
LTC4290AIUJ#TRPBF6x6 QFN-40I$8.06
LTC4290BIUJ#PBF6x6 QFN-40I$10.00$7.00
LTC4290BIUJ#TRPBF6x6 QFN-40I$7.06
LTC4290CIUJ#PBF6x6 QFN-40I$10.00$7.00
LTC4290CIUJ#TRPBF6x6 QFN-40I$7.06
Demo Boards
Part NumberDescriptionPrice
DC1843BLTC4290B/LTC4271: (DC1680 + DC1842) 8-Port 25.5W Demo Kit (req DC590)$250.00
Companion Boards
Part NumberDescriptionPrice
DC590BIsolated USB Serial Controller for Linear Technology QuikEval-Compatible Demo Boards$50.00
Reliability Data
Product Selector Card
Press Release
CAD Symbol CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprint compatible with Cadence ORCAD® v16.5 or later, Mentor Graphics PADS® v9.5 or later, and Altium 14.2.5 or later.
Related Product
LTC4290/LTC4271 - 8-Port PoE/PoE+/LTPoE++ PSE Controller
LTC4290 Package Drawing LTC4290
R547 - Reliability Data
LTPoE++ PSE Controllers
PoE PD Controllers
Power over Ethernet Solutions
隔离式 8 端口 PoE PSE 控制器无需光耦合器以实现最低的解决方案成本
LTC4290 Footprints and Symbols