LTC4271
Info : RECOMMENDED FOR NEW DESIGNS
searchIcon
cartIcon

LTC4271

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

Show More showmore-icon

Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $3.61
Features
  • 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
  • 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 52-Lead 7mm × 8mm (LTC4270) and 24‑Lead 4mm × 4mm (LTC4271) QFN Packages
Additional Details
show more Icon

The LTC4270/LTC4271 chipset is a 12-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 LTC4270/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 LTC4270/LTC4271 includes an I2C serial interface operable up to 1MHz.

The LTC4270/LTC4271 is available in multiple power grades allowing delivered PD power up to 90W.

APPLICATIONS

  • PoE PSE Switches/Routers
  • PoE PSE Midspans
Part Models 2
1ku List Price Starting From $3.61

close icon
Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC4271IUF#PBF
  • HTML
  • HTML
LTC4271IUF#TRPBF
  • HTML
  • HTML

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Aug 29, 2022

- 22_0212

LTC4270 Datasheet Limit Change

Feb 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Aug 29, 2022

- 22_0212

arrow down

LTC4270 Datasheet Limit Change

Feb 20, 2022

- 21_0269

arrow down

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

Software & Part Ecosystem

Software & Part Ecosystem

 
Software Interface Datasheet
Info:False

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

Evaluation Kit

Evaluation Kits 3

reference details image

DC1843B

LTC4290B/LTC4271: (DC1680 + DC1842) 8-Port 25.5W Demo Kit (requires DC590)

zoom

DC1843B

LTC4290B/LTC4271: (DC1680 + DC1842) 8-Port 25.5W Demo Kit (requires DC590)

LTC4290B/LTC4271: (DC1680 + DC1842) 8-Port 25.5W Demo Kit (requires DC590)

Product Detail

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.

reference details image

DC1840C

LTC4270B/LTC4271 Demo Board Kit | DC1680 + DC1682, 12-Port 25.5W PSE (Requires DC590)

zoom

DC1840C

LTC4270B/LTC4271 Demo Board Kit | DC1680 + DC1682, 12-Port 25.5W PSE (Requires DC590)

LTC4270B/LTC4271 Demo Board Kit | DC1680 + DC1682, 12-Port 25.5W PSE (Requires DC590)

Product Detail

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.

reference details image

DC590B

Isolated USB Serial Controller for QuikEval-Compatible Demo Boards

Recently Viewed