LTC4270
Info : RECOMMENDED FOR NEW DESIGNS
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LTC4270

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 6
1ku List Price Starting From $10.67
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
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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 6
1ku List Price Starting From $10.67

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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Aug 29, 2022

- 22_0212

LTC4270 Datasheet Limit Change

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Aug 24, 2021

- 21_0168

LTC4270 Bond Wire Diameter Change from 1.3mil to 0.8mil

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Jul 31, 2020

- 20_0245

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

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PCN

Aug 29, 2022

- 22_0212

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LTC4270 Datasheet Limit Change

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PRODUCTION

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PRODUCTION

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PRODUCTION

Aug 24, 2021

- 21_0168

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LTC4270 Bond Wire Diameter Change from 1.3mil to 0.8mil

LTC4270AIUKG#PBF

PRODUCTION

LTC4270AIUKG#TRPBF

PRODUCTION

LTC4270BIUKG#PBF

PRODUCTION

LTC4270BIUKG#TRPBF

PRODUCTION

LTC4270CIUKG#PBF

PRODUCTION

LTC4270CIUKG#TRPBF

PRODUCTION

Jul 31, 2020

- 20_0245

arrow down

Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC4270AIUKG#PBF

PRODUCTION

LTC4270AIUKG#TRPBF

PRODUCTION

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

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DC1840C

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

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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.

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DC590B

Isolated USB Serial Controller for QuikEval-Compatible Demo Boards

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