MAX5995B

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

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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Description

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 -40ºC to +85ºC temperature range.
MAX5995A, MAX5995B, MAX5995C: Simplified Block Diagram MAX5995A, MAX5995B, MAX5995C: Simplified Block Diagram Enlarge+

Key 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

Applications/Uses

  • Building Automation
  • IEEE 802.3bt Powered Devices
  • Lighting
  • Small Cell, Pico Cell
  • VOIP Phones, IP Security Cameras
  • Wireless Access Point
Part NumberComplianceRDS(ON)
(Ω)
PWMUVLO Threshold
(V)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
PD MOSFETSee Notes
MAX5995B 
IEEE 802.3af
IEEE 802.3at
IEEE 802.3bt
0.1No35.4
TQFN/16
-40 to +85$2.60 @1k
See All Powered Devices (31)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


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

Quality and Environmental Data

Request Reliability Report for: MAX5995B 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX5995BETE+
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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