MAX5995A
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MAX5995A

IEEE 802.3bt-Compliant, Powered Device Interface Controllers with Integrated 91W High-Power MOSFET

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IEEE 802.3af/at/bt Compliant; Power Delivered by PD is Doubled to Support Type 1 to Type 4 PSE and Multi-Event Classification

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Features
  • IEEE 802.3af/at/bt Compliant
  • Type 1~4 PSE Classification Indicator or an External Wall Adapter Indicator Output
  • Simplified Wall Adapter Interface
  • Multi-Event Classification 0–8
  • Intelligent MPS (MAX5995B/MAX5995C, Patent US9152161)
  • Sleep Mode and Ultra-Low-Power Sleep Mode (MAX5995A/MAX5995B)
  • 100V Input Absolute Maximum Rating
  • Inrush Current Limit During Startup
  • Current Limit During Normal Operation
  • Current Foldback Protection
  • Undervoltage Lockout at 36V
  • LED Driver with Programmable LED Current (MAX5995A/MAX5995B)
  • Overtemperature Protection
  • Multi-Event Power Level Indication
  • Autoclass Feature (MAX5995C)
  • Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN
Additional Details
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The MAX5995A/MAX5995B/MAX5995C provide 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. The devices provide the PD with a detection signature, classification signature, and an integrated isolation power switch with startup inrush current control. During the startup period, the devices limit the current to 135mA (typ) before switching to the higher current limit (1800mA to 2400mA, typ) when the isolation power MOSFET is fully enhanced. The devices feature Multi-Event classification, Intelligent MPS (MAX5995B/MAX5995C), Autoclass (MAX5995C), an input UVLO with wide hysteresis and long deglitch time to compensate for twistedpair cable resistive drop and to assure glitch-free transition during power-on/-off conditions. The devices can withstand a maximum voltage of 100V at the input.

The devices support a Multi-Event classification method, as specified in the IEEE 802.3bt standard, and provide a signal to indicate from Type 1 to Type 4 Power Sourcing Equipment (PSE). The devices can detect the presence of a wall adapter power source connection and allow a smooth switch-over from the PoE power source to the wall power adapter.

The devices also provide a power-good (PG) signal, two-step current limit and foldback control, overtemperature protection. A sleep mode feature in the MAX5995A/MAX5995B minimizes low power consumption while generating the Maintain Power Signature (MPS) to maintain PSE connection. An Ultra-Low-Power sleep mode feature in the MAX5995A/MAX5995B further reduces power consumption while still generating MPS current. The MAX5995B/MAX5995C provides Intelligent Maintain Power Signature (IMPS) feature to automatically enable MPS current by detecting the port current.The devices feature a LED driver that is activated during sleep mode, Ultra-Low-Power sleep mode(MAX5995A/MAX5995B), and Intelligent MPS mode(MAX5995B/MAX5995C). Multi-Event indication feature provides patterned signals to indicate power level allocated from PSE to PD in 5 different scenarios. The MAX5995C provides Autoclass feature to enable advanced applications that allow the PSE to effectively optimize power allocation to PD.

The MAX5995A/MAX5995B/MAX5995C are available in a 16-pin, 5mm x 5mm, TQFN power package. These devices are rated over the -40°C to 125°C (MAX5995AATE/BATE/CATE) and -40°C to 85°C (MAX5995AETE/BETE/CETE) temperature ranges.

Applications

  • Building Automation
  • IEEE 802.3bt Powered Devices
  • Lighting
  • Small Cell, Pico Cell
  • VOIP Phones, IP Security Cameras
  • Wireless Access Point
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MAX5995A

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Data Sheet

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UPDATED 09/03/2019
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MAX5995A-MAX5995C: IEEE 802.3bt-Compliant, Powered Device Interface Controllers with Integrated 91W High-Power MOSFET Data Sheet (Rev.3)

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UPDATED 07/08/2020
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Generate Greater Power Savings for Power-Over-Ethernet Industrial Security Cameras redirect icon

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Software & Part Ecosystem

Evaluation Kits 1

MAX5995BEVKIT

Evaluation Kit for the MAX5995A, MAX5995B, MAX5995C, MAX5974D

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MAX5995BEVKIT

Evaluation Kit for the MAX5995A, MAX5995B, MAX5995C, MAX5974D

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MAX5995BEVKIT
Evaluation Kit for the MAX5995A, MAX5995B, MAX5995C, MAX5974D

Features and Benefits

  • IEEE 802.3af/at/bt-Compliant PD Interface Circuit
  • Multi-Event Classification 0-8
  • -36V to -57V Input Range
  • Demonstrates a 71W PD Design with Isolated Active-Clamped Forward Topology DC-DC Converter
  • +12V Output at 5.5A
  • Startup Inrush Current Limit of 135mA (typ)
  • 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
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Product Detail

The MAX5995 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 MAX5995B 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/btcompliant power-sourcing equipment (PSE). Refer to the MAX5952, MAX5965A/MAX5965B, and MAX5980 IC data sheets for PSE controllers. 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 and two active full-wave rectifiers (N101 and N102) 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 (MEC), Intelligent MPS, inrush current control, input undervoltage lockout (UVLO), and DC-DC step-down converter. The step-down converter operates at a fixed 290kHz 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

Resources

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MAX5995BEVKIT Gerber File - Design Files Download

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Evaluation Kits1

MAX5995BEVKIT

Evaluation Kit for the MAX5995A, MAX5995B, MAX5995C, MAX5974D

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