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reference designMP3921 | Demoboard EV3921-U-00A

Monolithic Power Systems MP3921 | Demoboard EV3921-U-00A

Single-Port, IEEE 802.3af/at PSE Controller for Power over Ethernet

Overview

TopologyLAN / POE
Input voltage44-57 V
Output 157 V
IC revision1.0

Description

The EV3921-U-00A is an evaluation board designed to demonstrate the capabilities of the MP3921, a single-port power-sourcing equipment (PSE) power controller for IEEE 802.3af/at-compliant power over Ethernet (PoE) applications.The MP3921 provides all the functions of IEEE 802.3af/at, including detection, single-event and two-event classification, current limiting, and disconnected load detection. All the functions can be configured to work in automatic mode or software configuration mode via the I2C.

Features

  • IEEE802.3af/at Compliant
  • 0.25Ω Current-Sense Resistor (RSENSE)
  • Automatic Mode and I2C Command Control Mode
  • Internal VCC Power Supply
  • Three-Wire I2C Interface for Isolated Applications
  • Two INT Pins for Interrupt Priority Selection
  • Disconnected DC Load Detection
  • Instantaneous Current/Voltage Readout
  • Configurable I2C Address
  • Thermal Protection
  • Available in a QFN-32 (5mmx5mm) Package

Typical applications

  • PoE
  • Surveillance Network Video Recorders (NVRs) and Digital Video Recorders (DVRs)
  • Power-Sourcing Equipment (PSE) Switches/Routers

More information

Products

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Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
λDom typ.(nm)
Emitting Color
λPeak typ.(nm)
IV typ.(mcd)
VF typ.(V)
Chip Technology
2θ50% typ.(°)
C
Tol. C
VR(V (DC))
Size
DF(%)
RISO
Ceramic Type
L(mm)
W(mm)
H(mm)
Fl(mm)
Packaging
xPxC
Type
Shielding
EMI
Application System
IR(A)
Working Voltage(V (AC))
Pins
Version
Data rate
PoE
Ports
Tab
Improved CMRR
Operating Temperature
LED
PHY Chip Mode
Mount
Shield Tabs
SamplesAvailability & Sample
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150080RS75000
SPECWL-SMCW SMT Mono-color Chip LED Waterclear, 625 nm, Red
Simu­lation
Availability
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Downloads8 files

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ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWL-SMCW SMT Mono-color Chip LED Waterclear
Dominant Wavelength [typ.]625 nm
Emitting ColorRed 
Peak Wavelength [typ.]630 nm
Luminous Intensity [typ.]150 mcd
Forward Voltage [typ.]2 V
Chip TechnologyAlInGaP 
Viewing Angle Phi 0° [typ.]140 °
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Size0805 
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Length2 mm
Width1.25 mm
Height0.7 mm
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PackagingTape and Reel 
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Operating Temperature -40 °C up to +85 °C
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MountSMT 
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7499511611A
SPECWE-RJ45 LAN Transformer, –, –
Simu­lation
Availability
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Downloads7 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-RJ45 LAN Transformer
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Length33.02 mm
Width17 mm
Height13.87 mm
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TypePoE+ 
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EMI FingersYes 
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VersionTHT 
Data rate1000BASE-T 
PoEPoE+ 
Ports1 
Tab PositionUp 
Improved Common Mode RejectionYes 
Operating Temperature 0 °C up to +70 °C
LED (Left-Right)green/orange-yellow 
PHY Chip Modecurrent & voltage 
MountTHT 
Shield TabsYes 
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885012207022
SPECWCAP-CSGP MLCCs 10 V(DC), –, –
Simu­lation
Availability
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Downloads9 files

EDA models: Components ZIP

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Download all 9 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWCAP-CSGP MLCCs 10 V(DC)
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Capacitance1 µF
Capacitance±10% 
Rated Voltage10 V (DC)
Size0805 
Dissipation Factor5 %
Insulation Resistance0.5 GΩ
Ceramic TypeX7R Class II 
Length2 mm
Width1.25 mm
Height1.25 mm
Pad Dimension0.5 mm
Packaging7" Tape & Reel 
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Operating Temperature -55 °C up to +125 °C
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612010235121
SPECWR-BHD 2.54 mm Male, –, –
Simu­lation–
Availability
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Downloads7 files

EDA models: Components ZIP

CAD files ZIP

Download all 7 files as zip archive
ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-BHD 2.54 mm Male
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Insulation Resistance1000 MΩ
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Length20.3 mm
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PackagingTray 
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TypeStraight 
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Rated Current3 A
Working Voltage250 V (AC)
Pins10 
VersionLow Profile 
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Operating Temperature -40 °C up to +125 °C
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MountTHT 
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61300211121
SPECWR-PHD Pin Header - Single, –, –
Simu­lation–
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Downloads7 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-PHD Pin Header - Single
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Insulation Resistance1000 MΩ
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Length5.08 mm
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PackagingBag 
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TypeStraight 
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Rated Current3 A
Working Voltage250 V (AC)
Pins2 
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Operating Temperature -40 °C up to +105 °C
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MountTHT 
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–Check availability
615008138021
SPECWR-MJ Cat 3 Modular Jacks – THT, –, –
Simu­lation–
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Downloads7 files

EDA models: Components ZIP

CAD files ZIP

Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWR-MJ Cat 3 Modular Jacks – THT
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Insulation Resistance500 MΩ
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PackagingTray 
Number of Pins (xPxC)8P8C 
TypeVertical 
ShieldingPlastic 
EMI FingersNo 
Application SystemCAT 3 
Rated Current1.5 A
Working Voltage120 V (AC)
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Ports1x1 
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Operating Temperature -40 °C up to +85 °C
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MountTHT 
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