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MAX5969A

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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

Printable Data Sheet

Product Details

See parametric specs for Powered Devices

Key Features

See parametric specs for Powered Devices

Parametric specs for Powered Devices

Compliance	IEEE 802.3af IEEE 802.3at
R_DS(ON) (Ω) (PD MOSFET)	0.5
PWM	No
UVLO Threshold (V)	35.4
Package/Pins	TDFN/10
Oper. Temp. (°C)	-40 to +85
Budgetary Price (See Notes)	2.12

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See parametric specs for Powered Devices

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Simplified Block Diagram

Technical Docs

Data Sheet	IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET	Jul 16, 2015
App Note	PoE and LED Lighting: the Perfect Match
App Note	Creating the Power Subsystem for Power Over Ethernet Designs
Tutorial	Advantages of Internet Protocol (IP) Cameras and H.264 Compression for Security and Surveillance Video

Design & Development

Click any title below to view the detail page where available.

Hardware Development

Evaluation Board

MAX5969BEVKIT

$59.60

Description/Applications

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).

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Features

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

Evaluation Board

MAX5969AEVKIT

$59.55

Description/Applications

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.

View Details

Features

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

SYSTEM BOARD

MAXREFDES1149: 12V/1A, Synchronous, No-Opto Isolated PoE DC-DC Converter Using MAX17690, MAX17606, MAX5969A

SYSTEM BOARD

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

SYSTEM BOARD

MAXREFDES138#: No-Opto Isolated, PoE, 48V to 12V, 12W Flyback Power Supply

SYSTEM BOARD

MAXREFDES128#: No-Opto Isolated, PoE, 48V to 5V, 12.5W Flyback Power Supply

SYSTEM BOARD

MAXREFDES108#: Non-isolated 12V/1A PoE Powered Device Power Supply

SYSTEM BOARD

MAXREFDES98#: Non-isolated 5V/2.5A PoE Powered Device Power Supply

Reference Circuit

PoE-Powered LED Lighting Reference Circuit

Reference Circuit

Active-Clamped Forward, Dual-Output PD Provides High-Performance Solution for PoE Applications

Evaluation Board

MAX5969BEVKIT

Data Sheet

$59.60

Description/Applications

View Details

Features

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

Evaluation Board

MAX5969AEVKIT

Data Sheet

$59.55

Description/Applications

View Details

Features

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

SYSTEM BOARD

MAXREFDES1149: 12V/1A, Synchronous, No-Opto Isolated PoE DC-DC Converter Using MAX17690, MAX17606, MAX5969A

SYSTEM BOARD

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

SYSTEM BOARD

MAXREFDES138#: No-Opto Isolated, PoE, 48V to 12V, 12W Flyback Power Supply

SYSTEM BOARD

MAXREFDES128#: No-Opto Isolated, PoE, 48V to 5V, 12.5W Flyback Power Supply

SYSTEM BOARD

MAXREFDES108#: Non-isolated 12V/1A PoE Powered Device Power Supply

SYSTEM BOARD

MAXREFDES98#: Non-isolated 5V/2.5A PoE Powered Device Power Supply

Reference Circuit

PoE-Powered LED Lighting Reference Circuit

Reference Circuit

Active-Clamped Forward, Dual-Output PD Provides High-Performance Solution for PoE Applications

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Parameters

Parametric specs for Powered Devices

Compliance	IEEE 802.3af IEEE 802.3at
R_DS(ON) (Ω) (PD MOSFET)	0.5
PWM	No
UVLO Threshold (V)	35.4
Package/Pins	TDFN/10
Oper. Temp. (°C)	-40 to +85
Budgetary Price (See Notes)	2.12

Compare products in Family

See parametric specs for Powered Devices

Key Features

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

Applications/Uses

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

Description

The MAX5969A/MAX5969B provide a complete interface for a powered device (PD) to comply with the IEEE® 802.3af/at standard in a power-over-Ethernet (PoE) system. The MAX5969A/MAX5969B provide the PD with a detection signature, classification signature, and an integrated isolation power switch with inrush current control. During the inrush period, the MAX5969A/MAX5969B limit the current to less than 180mA before switching to the higher current limit (720mA to 880mA) when the isolation power MOSFET is fully enhanced. The devices feature an input UVLO with wide hysteresis and long deglitch time to compensate for twisted-pair cable resistive drop and to assure glitch-free transition during power-on/-off conditions. The MAX5969A/MAX5969B can withstand up to 100V at the input.

The MAX5969A/MAX5969B support a 2-event classification method as specified in the IEEE 802.3at standard and provide a signal to indicate when probed by Type 2 power-sourcing equipment (PSE). The devices detect the presence of a wall adapter power-source connection and allow a smooth switchover from the PoE power source to the wall power adapter.

The MAX5969A/MAX5969B also provide a power-good (PG) signal, two-step current limit and foldback, overtemperature protection, and di/dt limit.

The MAX5969A/MAX5969B are available in a space-saving, 10-pin, 3mm × 3mm, TDFN power package. These devices are rated over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX5969A, MAX5969B: Typical Application Circuit

Technical Docs

Data Sheet	IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET	Jul 16, 2015
App Note	PoE and LED Lighting: the Perfect Match
App Note	Creating the Power Subsystem for Power Over Ethernet Designs
Tutorial	Advantages of Internet Protocol (IP) Cameras and H.264 Compression for Security and Surveillance Video

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

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INTERACTIVE Data Sheet

MAX5969A

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

Product Details

Key Features

Applications/Uses

Simplified Block Diagram

Technical Docs

Design & Development

Support & Training

Parameters

Key Features

Applications/Uses

Description

Simplified Block Diagram

Technical Docs

Support & Training

MAX5969A Related Videos