MAX5996A

IEEE 802.3bt-Compliant, Powered Device with Power Telemetry and Power/Current Limit

PoE PD with Power Telemetry and Power/Current Built in 90W Isolated Switch

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Overview

Features and Benefits
Product Details

Features and Benefits

Accurate Power Telemetry (Patent Pending)
Constant Power/Current Limit (Patent Pending)
LLDP Power/Current Level Reading (Patent pending)
IEEE802.3bt Compliant
Built-in 90W Isolation Switch
Multi-Classification
Multi-Event Power Level Indication
Simplified Wall Adapter Interface
Inrush Current Limit During Startup
Current Limit During Normal Operation
Overtemperature Protection
AutoClass
Selectable Green MPS
Intelligent MPS (Patent US9152161)
5mm x 5mm, 16-Pin TQFN

Product Details

The MAX5996A/MAX5996B/MAX5996C provides a complete interface for a powered device (PD) to comply with the IEEE^® 802.3af/at/bt standard in a Power-Over-Ethernet (PoE) system with a detection signature, classification signature, and an integrated power switch with startup inrush current control. During the startup period, the devices limit the current to 135mA and it switches to a higher current limit when the power MOSFET is fully enhanced. The devices feature a Multi-Event classification, Intelligent MPS, Autoclass, and an input UVLO with wide hysteresis and deglitch time to assure glitch-free transition during power-on/off. The devices can withstand a maximum voltage of 100V at the input.

The devices can detect the presence of a wall adapter power and allow a smooth switch-over from the PoE power source to the wall adapter. The devices also provide a power-good (PG) signal, two-step current limit, and foldback control, overtemperature protection.

The Intelligent Maintain Power Signature (IMPS) feature allows to automatically enable MPS current by detecting the port current. Autoclass feature is to enable advanced applications that allow the PSE to optimize power allocation to PD.

When working with dc-dc controller IC, the MAX5996C features a constant power/current limit when the port power/current consumption reaches PSE power/current limit. Multi-Event indication feature provides patterned signals to indicate power level allocated from PSE to PD in 7 different scenarios, and accurate real-time power telemetry reporting. LLDP pin of the MAX5996C allows to read power/current limit configuration from system microcontroller and overwrite power/current limit from classification process.

The MAX5996A/MAX5996B/MAX5996C are available in a 16-pin, 5mm x 5mm, TQFN power package. These devices are rated over the -40°C to 125°C temperature range.

Applications

Building Automation
IEEE 802.3bt Powered Devices
Lighting
Small Cell, Pico Cell
VOIP Phones, IP Security Cameras
Wireless Access Point

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 (1)

MAX5996CEVKIT

Evaluation Kit for the MAX5996A/MAX5996B/MAX5996C

MAX5996CEVKIT

View Detailed Evaluation Kit Information

The MAX5996A/MAX5996B/MAX5996C 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 -57V supply rail systems. The EV kit uses the MAX5996C IEEE^® 802.3af/at/bt-compliant network PD interface controller in a 16-pin TQFN package with an exposed pad. The IC is used in Power-over-Ethernet (PoE) applications requiring DC power from an Ethernet network port for PDs such as VoIP phones, wireless access nodes, security cameras, lighting, and building automation.

The EV kit receives power from IEEE 802.3af/at/bt- 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 1 Gigabit RJ45 magnetic jack 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 and allows 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, Multi-Event Classification, Power/Current limiting, Power telemetry report, LLDP reclassification, Intelligent MPS, inrush current control, input undervoltage lockout (UVLO), and DC-DC step-down converter. The step-down converter operates at a fixed 395kHz switching frequency and is configured for an isolated active-clamped forward topology with output voltage +12V DC that can deliver 5.5A of current.

Applications

Building Automation
IEEE 802.3bt Powered Devices
Lighting
Small Cell, Pico Cell
VOIP Phones, IP Security Cameras
Wireless Access Point

Features & Benefits

IEEE 802.3af/at/bt-Compliant PD Interface Circuit
Multi-Event Classification 0-8
-36V to -57V Input Range
Demonstrates a 51W PD Design with Isolated Flyback DC-DC Converter
+12V Output at 3.75A
Startup Inrush Current Limit of 135mA (typ)
Power Telemetry Through MEC
Power/Current Limiting
LLDP Reclassification
Current Limit During Normal Operation
Evaluates Endspan and Midspan Ethernet Systems
Type 1-4 PSE Classification Indicator
Simplified Wall Adapter Interface
Demonstrates Sleep and Ultra-Sleep Power-Saving Modes
Proven PCB Layout
Fully Assembled and Tested

Software

MAX5996CEVKIT GUI Software (Rev. 1.0)

ZIP

76.21 M

Documentation & Resources

Data Sheet

MAX5996A-MAX5996C: IEEE 802.3bt-Compliant, Powered Device with Power Telemetry and Power/Current Limit Data Sheet (Rev. 0)
10/25/2021
PDF

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

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.