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Multisource, High-Power, High-Performance Powered Device Controllers

Flexible, High-Power PD Devices Deliver Up to 200W

Product Details

Key Features

Parametric specs for Powered Devices
Compliance IEEE 802.3af
IEEE 802.3at
PWM No
UVLO Threshold (V) 38.6
Package/Pins TQFN/24
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
1.77
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Parameters

Parametric specs for Powered Devices
Compliance IEEE 802.3af
IEEE 802.3at
PWM No
UVLO Threshold (V) 38.6
Package/Pins TQFN/24
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
1.77

Key Features

  • IEEE 802.3af/at Compliant
  • UPoE Compatible
  • High-Power 2x2P/Multi-PD Synchronization/Multi-PD Redundancy
  • Integrated Active FET Bridge Control and Back-Powering Protection
  • Selectable UVLO for Medical/Industrial Applications
  • 2-Level Inrush-Current Control
  • Intelligent MPS
  • Simplified Wall Adapter Interface for Seamless Power Transition
  • Ultra-Low-Power/Sleep Mode
  • 2-Event Classification or an External Wall Adapter Indicator Output
  • PoE Classification 0 to 5
  • Gate Driver for External Isolation MOSFET
  • Selectable Current Limit and Foldback
  • RJ45 12V Supply Input
  • 6.5s Sleep Mode Delay

Applications/Uses

  • Femtocell, Picocell, Microcell
  • Fiber-to-the-Home/Building (FTTH/FTTB)
  • High-Power 2x2P PD
  • IEEE 802.3af/at-Powered Devices (PD)
  • IP Phones
  • IP Security Cameras (IPC)
  • Multi-PD Redundancy
  • Universal Power-over-Ethernet (UPoE)
  • WiMAX® Base Stations
  • Wireless Access Nodes

Description

The MAX5992A/MAX5992B multisource, high-power, high-performance powered device (PD) controllers provide a complete interface control for PDs to comply with the IEEE® 802.3af/at standard in a Power-over-Ethernet (PoE) system. The devices provide the PD with a detection signature, classification signature, and an isolation MOSFET driver with current-limit control. In addition, the intelligent maintain power signature (MPS) and active FET bridge control make the PD more power efficient. The devices feature a active-low SIG_OK output signal for high-power Multi-2P PD applications. The selectable inrush-current modes allow Multi-PD, fiber-to-the-home/fiber-to-the-building (FTTH/FTTB) operation in redundancy applications. The devices feature an input UVLO, wide hysteresis, and long deglitch time to compensate for twisted-pair cable resistive drop to assure glitch-free transition during power-on/power-off conditions. The devices can operate from a 20.8V low-voltage supply by a selectable UVLO. The devices can withstand up to 100V at the input.

The devices 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. Moreover, the selectable WAD_SEL supports seamless power transition from a wall adapter to PoE if PoE is already enabled.

The devices also provide a power-good (PG) signal, 2-level current limit, foldback, and overtemperature protection. A sleep mode feature provides low-power consumption while supporting MPS. An ultra-low power sleep mode feature further reduces power consumption to comply with ultra-low power requirements while still supporting MPS. The devices also feature an LED driver that is automatically activated during sleep/ultra-low power sleep/MPS mode. The MAX5992A has 38.6V PoE UVLO and the MAX5992B has 35.4V PoE UVLO and feature a 6.5s sleep mode delay.

The MAX5992A/MAX5992B are available in a 24-pin, 4mm x 4mm, TQFN power package and are rated over the -40°C to +85°C extended temperature range.

Simplified Block Diagram

MAX5992A, MAX5992B: Simplified Block Diagram MAX5992A, MAX5992B: Simplified Block Diagram Zoom icon

Technical Docs

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 .