LTC4291-1
Info : RECOMMENDED FOR NEW DESIGNS
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LTC4291-1

4-Port IEEE 802.3bt PoE PSE Controller

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 2
1ku List Price Starting From $2.43
Features
  • Four PSE Ports
    • Two Power Channels per Port
  • Low Power Path Dissipation per Channel
    • 150mΩ Sense Resistance
    • 30mΩ or Lower MOSFET RDS(ON)
  • Chipset Provides Electrical Isolation
    • Eliminates Optos and Isolated 3.3V Supply
  • Very High Reliability Multipoint PD Detection
    • Connection Check Distinguishes Single-Signature and Dual-Signature PDs
  • Fully Compliant IEEE 802.3bt Type 3 and 4 PSE
    • Compliant Support for Type 1, 2, 3, and 4 PDs
  • Continuous, Dedicated Per-Port Power and Current Monitoring
    • Per-Port Power Policing
  • 1MHz I2C Compatible Serial Control Interface
  • Pin or I2C Programmable PD Power Up to 71.3W
  • Available in a 40-Lead 6mm × 6mm (LTC4292) and 24-Lead 4mm × 4mm (LTC4291-1) QFN Packages
Additional Details
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The LTC4291-1 / LTC4292 chipset is a 4-port power sourcing equipment (PSE) controller designed for use in IEEE 802.3bt Type 3 and 4 compliant Power over Ethernet (PoE) systems. The LTC4291-1 / LTC4292 is designed to power compliant 802.3af, 802.3at, and 802.3bt PDs. The LTC4291-1 / LTC4292 chipset delivers lowest-in-industry heat dissipation by utilizing low RDS(ON) external MOSFETs and 0.15Ω sense resistance per power channel. A transformer-isolated communication protocol replaces expensive opto-couplers and complex isolated 3.3V supply, resulting in significant BOM cost savings.

Advanced power management features include per-port 14-bit current monitoring, programmable current limit, and versatile fast shutdown of preselected ports. Advanced power management host software is available under a no-cost license. PD detection uses a proprietary multipoint detection mechanism ensuring excellent immunity from false PD identification. Autoclass and 5-event physical classification are supported. The LTC4291-1 / LTC4292 includes an I2C serial interface operable up to 1MHz. The LTC4291-1/LTC4292 is pin or I2C programmable to negotiate PD delivered power up to 71.3W.

Part Models 2
1ku List Price Starting From $2.43

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Documentation

Documentation

Video

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC4291IUF-1#PBF
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LTC4291IUF-1#TRPBF
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Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

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Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

Software & Part Ecosystem

Software & Part Ecosystem

 
Software Interface Datasheet
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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.

 
QuikEval
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The QuikEval system is a USB-based product demonstration and data acquisition system that allows users to quickly evaluate the performance of products. The system consists of a USB Data Acquisition Controller board (DC590B) that connects to individual daughter cards for specific products.

Evaluation Kit

Evaluation Kits 2

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DC2685B-KIT

DC2683A and DC2684A-B LTC4291-1/LTC4292 4-Port IEEE 802.3bt PSE

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DC2685B-KIT

DC2683A and DC2684A-B LTC4291-1/LTC4292 4-Port IEEE 802.3bt PSE

DC2683A and DC2684A-B LTC4291-1/LTC4292 4-Port IEEE 802.3bt PSE

Product Detail

Demonstration circuit 2685B-KIT is an Ethernet Alliance Gen 2 PoE certified 4-port IEEE 802.3bt power sourcing equipment (PSE) composed of a DC2684A-B (daughter card)  and DC2683A (motherboard). The DC2685BKIT is used for evaluation of the LTC4291-1/LTC4292 PSE chipset. Up to four IEEE 802.3af, IEEE 802.3at, or IEEE 802.3bt powered devices (PDs) can be connected and powered from this system using a single power supply. A DC590 is connected to the DC2685B-KITfor I2C interfacing with  QuikEval™.

This demonstration manual provides a quick start procedure, a DC2684A-B daughter card overview, a DC2683A mother board overview, schematics, and layout printouts.

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DC590B

Isolated USB Serial Controller for QuikEval-Compatible Demo Boards

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