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reference designLTC4291-1 | Demoboard DC2685B

Analog Devices LTC4291-1 | Demoboard DC2685B

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

Overview

TopologyOther Topology
Input voltage51-57 V
IC revisionA

Description

Demonstration circuit 2685B is a 4-port IEEE 802.3bt power sourcing equipment (PSE) composed of a DC2684A-B (daughter card) and DC2683A (motherboard). The DC2685B (kit) 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 for 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.

Features

  • Four PSE Ports
  • Two Power Channels per Port
  • Fully Compliant IEEE 802.3bt Type 3 and 4 PSE
  • Compliant Support for Type 1, 2, 3, and 4 PDs
  • 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
  • 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

Typical applications

  • PoE PSE Switches/Routers / PoE PSE Midspans

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
f(mm)
Pins
Type
IR(mA)
Working Voltage(V (AC))
Poles
L(mm)
Vaporphase process
H(mm)
Operation Force(g)
Electrical Life(Cycles)
Actuator Color
Washable
Data rate
Ports
PoE
Improved CMRR
Operating Temperature
VT(V (RMS))
Mount
L(µH)
SamplesAvailability & Sample
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418117270902
SPECWS-DITV Compact THT with Raised Actuator 2.54 mm, –, 2
Simu­lation–
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWS-DITV Compact THT with Raised Actuator 2.54 mm
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Pins2 
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Poles2 
Length6.08 mm
Vaporphase processnot specified 
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Operation Force800 g
Electrical Life2000 Cycles
Actuator ColorWhite 
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Operating Temperature -40 °C up to +85 °C
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434123050816
SPECWS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm, –, –
Simu­lation–
Availability
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Downloads6 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWS-TASV J-Bend SMT Tact Switch 6.0x3.5 mm
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Rated Current50 mA
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Vaporphase processnot specified 
Height5 mm
Operation Force160 g
Electrical Life50000 Cycles
Actuator ColorBlack 
WashableNo 
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Operating Temperature -40 °C up to +85 °C
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–Check availability
702937000
SPECWA-SNSR Self-Retaining Spacer, 4.8 mm, –
Simu­lation–
Availability
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Downloads3 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWA-SNSR Self-Retaining Spacer
Drilling in Panel4.8 mm
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Length19.1 mm
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Operating Temperature -30 °C up to +85 °C
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749022016
SPECWE-LAN LAN Transformer, –, 24
Simu­lation
Availability
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Downloads4 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-LAN LAN Transformer
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Pins24 
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Length18.16 mm
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Height10.16 mm
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Data rate1000BASE-T 
Ports1 
PoEPoE+ (up to 1150 mA) 
Improved Common Mode RejectionNo 
Operating Temperature 0 °C up to +70 °C
Insulation Test Voltage1500 V (RMS)
MountSMT 
Inductance350 µH
–Check availability
62000311121
SPECWR-PHD Pin Header, –, 3
Simu­lation–
Availability
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Downloads7 files

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header
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Pins3 
TypeStraight 
Rated Current2000 mA
Working Voltage200 V (AC)
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Length6 mm
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Operating Temperature -40 °C up to +105 °C
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MountTHT 
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–Check availability