Power Over Ethernet (POE) Controller, 57 V/10 mA, 1 MHz Interface, 25V UVLO Threshold, QFN-24

LTC4271IUF#PBF - Power Over Ethernet (POE) Controller, 57 V/10 mA, 1 MHz Interface, 25V UVLO Threshold, QFN-24

Image is for illustrative purposes only. Please refer to product description.

Manufacturer Part No:
Order Code:
Technical Datasheet:
See all Technical Docs

Product Overview

The LTC4271IUF#PBF is a 12-port Power Sourcing Equipment (PSE) Controller designed for use in IEEE 802.3 at 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. This chipset delivers lowest-in-industry heat dissipation by utilizing low-RDS(ON) external MOSFETs and 0.25R 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.
  • 12 Independent PSE channels
  • Compliant with IEEE 802.3 at type 1 and 2
  • Chipset provides electrical isolation
  • Eliminates up to 6 high speed opto-couplers
  • Eliminates isolated 3.3V Power supply
  • Low power dissipation
  • 0.25R Sense resistance per channel
  • Very high reliability 4-Point PD detection
  • 2-point Forced voltage
  • 2-point Forced current
  • VEE and VPORT Monitoring


Communications & Networking

Product Information

MSL 1 - Unlimited
Find similar products Choose and modify the attributes above to find similar products.

Associated Products

Related Searches


53 In stock

53 in stock for next day delivery (UK stock)

see cut-off times
Check stock and lead times
More stock available week commencing 04/03/19
£4.91 £ 4.91
Price for:
Multiple: 1 Minimum: 1
Quantity Price
1 + £4.91
10 + £4.46
25 + £2.98
50 + £2.95
100 + £2.91
250 + £2.88
500 + £2.84
No longer stocked:: No Longer Manufactured::
Add to Basket
Add Line Note
Total Price:
Total Price: ( )
Total Price: --

Customer Reviews


Like to see information about this product from other customers?

 Read discussions, blogs, documents from our community members.


Select document type(s) you want to see and click “Apply Filters” button
Post a question to one of our experts or start a discussion and get responses from supplier experts and fellow engineers in our community.