MAX5969B

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

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Overview

Features and Benefits
Product Details

Features and Benefits

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

Product Details

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.

Applications

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

Product Categories

Power Monitor, Control, and Protection
- PoE Powered Device (PD)

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Product Lifecycle Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (2)

MAX5969BEVKIT

Evaluation Kit for the MAX5969A and MAX5969B

MAX5969AEVKIT

Evaluation Kit for the MAX5969A and MAX5974A

MAX5969BEVKIT

View Detailed Evaluation Kit Information

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

Features & 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

MAX5969AEVKIT

View Detailed Evaluation Kit Information

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

Features & 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

Documentation & Resources

Data Sheets

MAX5969A-MAX5969B: IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET Data Sheet (Rev. 1)
7/16/2015
PDF

Reliability Data

MAX5969B Reliability Data
1/12/2023
PDF

Design Notes

40W Single Port MAX5971A Current Sensing
6/21/2016

Technical Articles

Reference Designs (7)

MAXREFDES1175

PoE Powered Device and 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

MAXREFDES31

3.3V and 5V PoE Powered Device

MAXREFDES1176

PoE Powered Device and Synchronous 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B

MAXREFDES1178

PoE Powered Device and Synchronous 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B

MAXREFDES1273

PoE Powered Device and 48V 850mA Active Clamp Forward DC DC Converter Using the MAX5974C and MAX5969B

MAXREFDES1177

PoE Powered Device and 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

MAXREFDES1206

PoE Powered Device and 24V/1A Active Clamp Forward DC-DC Converter Using the MAX5974C and MAX5969B

MAXREFDES1175

PoE Powered Device and 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

MAXREFDES1175

PoE Powered Device and 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

View Detailed Reference Design Information

Features & Benefits

IEEE 802.3af/at Compliance
Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN Package (MAX5969B)
30V to 60V Input Voltage Range
Programmable Switching Frequency from 50kHz to 250kHz
Programmable Input Enable/UVLO Feature
Programmable Input Overvoltage Protection
Adjustable Soft-Start
2A/4A Peak Source/Sink Gate Drive Capability
Hiccup Mode Short-Circuit Protection
Fast Cycle-by-Cycle Peak Current Limit
Thermal Shutdown Protection
Space-Saving, 16-Pin, 3mm × 3mm TQFN Package
-40°C to +125°C Operating Temperature Range

Parts Used

Resources

MAXREFDES1175 Design Files

ZIP

2.75 M

MAXREFDES31

3.3V and 5V PoE Powered Device

MAXREFDES31

3.3V and 5V PoE Powered Device

View Detailed Reference Design Information

Features & Benefits

Features:

IEEE 802.3af/at compliant
Dual output
Tight line regulation
Low ripple
Excellent load transient response
High efficiency

Applications:

Security cameras
Wireless access points
Point of sale terminals

Parts Used

Resources

MAXREFDES31 Design FIles

ZIP

1.6 M

MAXREFDES1176

PoE Powered Device and Synchronous 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B

MAXREFDES1176

PoE Powered Device and Synchronous 5V/1.4A No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B

View Detailed Reference Design Information

Features & Benefits

IEEE^® 802.3af/at Compliance
Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN Package (MAX5969B)
30V to 60V Input Voltage Range
Programmable Switching Frequency from 50kHz to 250kHz
Programmable Input Enable/UVLO Feature
Programmable Input Overvoltage Protection
Adjustable Soft-Start
2A/4A Peak Source/Sink Gate Drive Capability
Hiccup Mode Short-Circuit Protection
Fast Cycle-by-Cycle Peak Current Limit
Thermal Shutdown Protection
Space-Saving, 16-Pin, 3mm x 3mm TQFN Package
-40°C to +125°C Operating Temperature Range

Parts Used

Resources

MAXREFDES1176 Design FIles

ZIP

3.04 M

MAXREFDES1178

PoE Powered Device and Synchronous 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B

MAXREFDES1178

PoE Powered Device and Synchronous 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690, MAX17606, and MAX5969B

View Detailed Reference Design Information

Features & Benefits

IEEE^® 802.3af/at Compliance
Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN Package (MAX5969B)
30V to 60V Input Voltage Range
Programmable Switching Frequency from 50kHz to 250kHz
Programmable Input Enable/UVLO Feature
Programmable Input Overvoltage Protection
Adjustable Soft-Start
2A/4A Peak Source/Sink Gate Drive Capability
Hiccup Mode Short-Circuit Protection
Fast Cycle-by-Cycle Peak Current Limit
Thermal Shutdown Protection
Space-Saving, 16-Pin, 3mm x 3mm TQFN Package
-40°C to +125°C Operating Temperature Range

Parts Used

Resources

MAXREFDES1178 Design Files

ZIP

3.12 M

MAXREFDES1273

PoE Powered Device and 48V 850mA Active Clamp Forward DC DC Converter Using the MAX5974C and MAX5969B

MAXREFDES1273

PoE Powered Device and 48V 850mA Active Clamp Forward DC DC Converter Using the MAX5974C and MAX5969B

View Detailed Reference Design Information

Features & Benefits

Programmable switching frequency from 100kHz to 600kHz
Programmable frequency dithering for low-EMI, spread-spectrum operation
Programmable dead time, PWM soft-start, current slope compensation
Programmable feed-forward maximum duty-cycle clamp, 80% maximum limit
Frequency foldback for high-efficiency light-load operation
Internal bootstrap UVLO with large hysteresis
100μA (typ) startup supply current
Fast cycle-by-cycle peak current-limit, 35ns typical propagation delay
115ns current-sense internal leading-edge blanking
Output short-circuit protection with hiccup mode
Reverse current limit to prevent transformer saturation due to reverse current

Parts Used

Resources

MAXREFDES1273 Design Files

ZIP

1.28 M

MAXREFDES1177

PoE Powered Device and 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

MAXREFDES1177

PoE Powered Device and 12V/600mA No-Opto Flyback DC-DC Converter Using the MAX17690 and MAX5969B

View Detailed Reference Design Information

Features & Benefits

IEEE 802.3af/at Compliance
Thermally Enhanced, 3mm × 3mm, 10-Pin TDFN Package (MAX5969B)
30V to 60V Input Voltage Range
Programmable Switching Frequency from 50kHz to 250kHz
Programmable Input Enable/UVLO Feature
Programmable Input Overvoltage Protection
Adjustable Soft-Start
2A/4A Peak Source/Sink Gate Drive Capability
Hiccup Mode Short-Circuit Protection
Fast Cycle-by-Cycle Peak Current Limit
Thermal Shutdown Protection
Space-Saving, 16-Pin, 3mm × 3mm TQFN Package
-40°C to +125°C Operating Temperature Range

Parts Used

Resources

MAXREFDES1177 Design Files

ZIP

9.48 M

MAXREFDES1206

PoE Powered Device and 24V/1A Active Clamp Forward DC-DC Converter Using the MAX5974C and MAX5969B

MAXREFDES1206

PoE Powered Device and 24V/1A Active Clamp Forward DC-DC Converter Using the MAX5974C and MAX5969B

View Detailed Reference Design Information

Features & Benefits

Programmable Switching Frequency from 100kHz to 600kHz
Programmable Frequency Dithering for Low-EMI, Spread-Spectrum Operation
Programmable Dead Time, PWM Soft-Start, Current Slope Compensation
Programmable Feed-Forward Maximum Duty-Cycle Clamp, 80% Maximum Limit
Frequency Foldback for High-Efficiency Light-Load Operation
Internal Bootstrap UVLO with Large Hysteresis
100μA (typ) Startup Supply Current
Fast Cycle-by-Cycle Peak Current-Limit, of 5V and35ns Typical Propagation Delay
115ns Current-Sense Internal Leading-Edge Blanking
Output Short-Circuit Protection with Hiccup Mode
Reverse Current Limit to Prevent Transformer Saturation Due to Reverse Current

Parts Used

Resources

MAXREFDES1206 Design FIles

ZIP

975.93 K

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.

Part Number	Material Declaration	Reliability Data	Pin/Package Drawing	CAD Symbols, Footprints & 3D Models
MAX5969BETB+	Material Declaration	Reliability Data	Thin Dual Flatpack No Leads, Exposed Pad	Ultra Librarian SamacSys
MAX5969BETB+T	Material Declaration	Reliability Data	Thin Dual Flatpack No Leads, Exposed Pad	Ultra Librarian SamacSys
Wafer Fabrication Data		MAX5969B Reliability Data

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.