MAX5969A

RECOMMENDED FOR NEW DESIGNS

IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET

IEEE 802.3af/at-Compliant Power-Device Interface Controllers Target PoE+ Applications

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • IEEE 802.3af/at Compliant
  • 2-Event Classification
  • Simplified Wall Adapter Interface
  • PoE Classification 0 to 5
  • 100V Input Absolute Maximum Rating
  • Inrush Current Limit of 180mA Maximum
  • Current Limit During Normal Operation Between 720mA and 880mA
  • Current Limit and Foldback
  • Legacy UVLO at 36V (MAX5969A)
  • IEEE 802.3af/at-Compliant, 40V UVLO (MAX5969B)
  • Overtemperature Protection
  • Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN
MAX5969A
IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET
MAX5969A, MAX5969B: Typical Application Circuit
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Documentation

Data Sheet 1

Design Note 1

Technical Articles 5

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Evaluation Kits

MAX5969BEVKIT

Evaluation Kit for the MAX5969A and MAX5969B

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Features and Benefits

  • IEEE 802.3af/at-Compliant PD Interface Circuit
  • -30V to -57V Input Range
  • Demonstrates an Isolated +12V/22.7W Flyback DC-DC Converter
  • PD Detection and Configurable Classification Signatures
  • 2-Event Classification or Wall Adapter Detect Output
  • Power-Good Indicator Output
  • In-Rush Current Limit of 180mA (max)
  • Evaluates Endspan and Midspan Ethernet Systems
  • Evaluates the MAX5969B/MAX5969A in a 10-Pin TDFN Package
  • Simplified Wall Adapter Interface
  • Fully Assembled and Tested

Product Details

The MAX5969B evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring an Ethernet port, network powered-device (PD) interface-controller circuit for IEEE® 802.3af/at-compliant power-over-Ethernet (PoE) systems. The EV kit features the MAX5969B IEEE 802.3af/at-compliant network PD interface controller IC in a 10-pin TDFN package. The MAX5969B is used in PoE applications requiring DC power from an Ethernet network port for PDs such as IP phones, wireless access nodes, and security cameras.

The EV kit receives power from IEEE 802.3af/at-compliant power-sourcing equipment (PSE). Refer to the MAX5965 and MAX5971 IC data sheets for PSE controllers. The PSE provides the required -30V to -57V DC power over an unshielded twisted-pair Ethernet network cable to the EV kit's RJ45 magnetic jack. The EV kit features a 1 x 1GbE RJ45 magnetic jack and two diode bridges for separating the DC power provided by an endspan or midspan Ethernet system.

The EV kit can also be powered by a wall adapter power source. The EV kit provides PCB pads to accept the output of a wall adapter power source. When a wall adapter power source is detected, it always takes precedence over the PSE source, allowing the wall adapter to power the EV kit.

The EV kit demonstrates the full functionality of the IC, such as PD detection signature, PD classification signature, in-rush current control, and input undervoltage lockout (UVLO). The EV kit also provides a modular RJ45 jack to interface with the Ethernet data signals only.

The EV kit also features a galvanically isolated 22.7W, 600kHz switching frequency flyback DC-DC converter, which uses the MAX15000A current-mode PWM controller. The IC's output provides power for the converter circuit. The DC-DC converter is configured for an output voltage of +12V and provides up to 1.9A. High efficiency up to 89% is achieved using a single transistor flyback DC-DC converter topology. The surface-mount transformer provides up to +1500V galvanic isolation for the output. UVLO, soft-start, and thermal shutdown provide a robust 22.7W isolated power supply. The DC-DC converter operates at 600kHz, allowing the use of small magnetics and output capacitors. The EV kit can also evaluate the MAX5969A after IC replacement (U1).

Applications

  • IEEE 802.3af/at Powered Devices
  • IP Phones, Wireless Access Nodes, IP Security Cameras
  • WiMAX™ Base Station

MAX5969AEVKIT

Evaluation Kit for the MAX5969A and MAX5974A

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Features and Benefits

  • IEEE 802.3af/at-Compliant PD Interface Circuit
  • -36V to -57V Startup Input Voltage Range
  • 92% (typ) Efficiency
  • Demonstrates Isolated 12W Flyback DC-DC Converter
  • Isolated +12V Output at 1A
  • 300kHz Switching Frequency
  • Configurable for Optocoupler Feedback Operation
  • Scalable to 12V Class 4 PD
  • PD Detection and Configurable Classification Signatures
  • 2-Event Classification or Wall Adapter Detect Output
  • Inrush Current Limit of 135mA (typ)
  • Internal UVLO at -35.6V (typ)
  • Evaluates Endspan and Midspan Ethernet Systems
  • Simplified Wall Adapter Interface
  • Proven PCB Layout
  • Fully Assembled and Tested

Product Details

The MAX5969A evaluation kit (EV kit) is a fully assembled and tested surface-mount circuit board featuring the MAX5969A IEEE 802.3af/at-compliant network powered device (PD) interface controller and the MAX5974A inductive-feedback, spread-spectrum, current-mode PWM controller. The EV kit is designed as a high-performance, compact, and cost-efficient solution for a Class 3 (scalable to Class 4) PD used in Power-over-Ethernet (PoE) applications.
The EV kit demonstrates the full functionality of the MAX5969A, such as PD detection signature, PD classification signature, inrush current control, and input undervoltage lockout (UVLO). The EV kit also features an isolated 12W, 300kHz switching-frequency, synchronous-rectified flyback DC-DC converter topology, using the MAX5974A inductive-feedback, current-mode PWM controller. The EV kit circuit is configured for an output voltage of +12V and provides up to 1A load current using primary-side regulation. The surface-mount transformer provides up to +1500V galvanic isolation for the output.
The EV kit receives power from IEEE® 802.3af/at-compliant power-sourcing equipment (PSE). The PSE provides the required -36V to -57V DC power over an unshielded twisted-pair Ethernet network cable to the EV kit's RJ45 magnetic jack. The EV kit features a 1 x 1Gb Ethernet RJ45 magnetic jack and two full-bridge diodes for separating the DC power provided by an endspan or midspan Ethernet system.
The EV kit circuit can also be powered by a +36V to +57V wall adapter power source, applied at the WAD_IN and WAD_GND PCB pads. When a wall adapter power source is detected, it always takes precedence over the PSE source, allowing the wall adapter to power the EV kit.
Warning: The EV kit is designed to operate with high voltages. Dangerous voltages are present on this EV kit and on equipment connected to it. Users who power up this EV kit or the power sources connected to it must be careful to follow safety procedures appropriately to work with high-voltage electrical equipment.
Under severe fault or failure conditions, this EV kit may dissipate large amounts of power, which could result in the mechanical ejection of a component or of component debris at high velocity. Operate this kit with care to avoid possible personal injury.

Applications

  • IEEE 802.3af/at Powered Devices
  • IP Phones, Wireless Access Nodes, IP Security Cameras
  • WiMAX™ Base Station
MAX5969BEVKIT
Evaluation Kit for the MAX5969A and MAX5969B
MAX5969AEVKIT
Evaluation Kit for the MAX5969A and MAX5974A

Reference Designs

MAXREFDES138
MAXREFDES138
MAXREFDES138 - Connected to MAXREFDES98 eval board
PWR LED lights up indicating MAXREFDES138 works
MAXREFDES138 Circuits from the lab

No-Opto Isolated, PoE, 48V to 12V, 12W Flyback Power Supply

View Detailed Reference Design

Features and Benefits

  • 36V to 57V input voltage
  • Compact and flexible
  • Minimal external components
  • Robust operation in adverse environments
  • 12.5W output capacity
  • ±3% output accuracy
maxrefdes98fig05
maxrefdes98fig05
maxrefdes98fig06
MAXREFDES98 Circuits from the lab

Non-isolated 5V/2.5A PoE Powered Device Power Supply

View Detailed Reference Design

Features and Benefits

  • 36V ~ 57V input voltage
  • Compact and flexible
  • Minimal external components
  • Robust operation in adverse environments
  • 12.5W output capacity
  • ±3% output accuracy
maxrefdes128fig02
maxrefdes128fig02
maxrefdes128fig03
maxrefdes128fig04
MAXREFDES128 Circuits from the lab

No-Opto Isolated, PoE, 48V to 5V, 12.5W Flyback Power Supply

View Detailed Reference Design

Features and Benefits

  • 36V to 57V input voltage
  • Compact and flexible
  • Minimal external components
  • Robust operation in adverse environments
  • 12.5W output capacity
  • ±3% output accuracy
maxrefdes108fig02
maxrefdes108fig02
maxrefdes108fig05
maxrefdes108fig06
MAXREFDES108 Circuits from the lab

Non-isolated 12V/1A PoE Powered Device Power Supply

View Detailed Reference Design

Features and Benefits

  • 36V ~ 57V input voltage
  • Compact and flexible
  • Minimal external components
  • Robust operation in adverse environments
  • 12W Output capacity
  • ±3% Output accuracy
MAXREFDES1149
MAXREFDES1149
MAXREFDES1149 Circuits from the lab

12V/1A, Synchronous, No-Opto Isolated PoE DC-DC Converter Using MAX17690, MAX17606, MAX5969A

View Detailed Reference Design

Features and Benefits

  • Features
  • IEEE® 802.3af/at Compliance
  • 2-Event Classification
  • No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
  • Ultra-Compact Layout
  • Peak Efficiency > 88%
  • 3mm × 3mm, 16-Pin TQFN (MAX17690), 6-Lead SOT23 (MAX17606), and Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN (MAX5969A) Packages
maxrefdes1148 figure 1
maxrefdes1148 figure 1
MAXREFDES1148 Circuits from the lab

MAXREFDES1148: 5V/2.5A, Synchronous, No-Opto Isolated PoE DC-DC Converter Using MAX17690, MAX17606, MAX5969A

View Detailed Reference Design

Features and Benefits

  • IEEE® 802.3af/at Compliance
  • 2-Event Classification
  • No Schottky-Synchronous Operation for High Efficiency and Reduced Cost
  • Ultra-Compact Layout
  • Peak Efficiency > 88%
  • 3mm × 3mm, 16-Pin TQFN (MAX17690), 6-Lead SOT23 (MAX17606), and Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN (MAX5969A) Packages
MAXREFDES138
No-Opto Isolated, PoE, 48V to 12V, 12W Flyback Power Supply
MAXREFDES138
MAXREFDES138 - Connected to MAXREFDES98 eval board
PWR LED lights up indicating MAXREFDES138 works
MAXREFDES98
Non-isolated 5V/2.5A PoE Powered Device Power Supply
maxrefdes98fig05
maxrefdes98fig06
MAXREFDES128
No-Opto Isolated, PoE, 48V to 5V, 12.5W Flyback Power Supply
maxrefdes128fig02
maxrefdes128fig03
maxrefdes128fig04
MAXREFDES108
Non-isolated 12V/1A PoE Powered Device Power Supply
maxrefdes108fig02
maxrefdes108fig05
maxrefdes108fig06
MAXREFDES1149
12V/1A, Synchronous, No-Opto Isolated PoE DC-DC Converter Using MAX17690, MAX17606, MAX5969A
MAXREFDES1149
MAXREFDES1148
MAXREFDES1148: 5V/2.5A, Synchronous, No-Opto Isolated PoE DC-DC Converter Using MAX17690, MAX17606, MAX5969A
maxrefdes1148 figure 1

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