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MAX5969A, 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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Status Explanations for product status codes

Part Number Status
MAX5969A Active: In Production. See Ordering Information for details.
MAX5969B Active: In Production. See Ordering Information for 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.

Data Sheet

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An evaluation board is available: MAX5969BEVKIT MAX5969AEVKIT MAXREFDES31

Key Features

  • 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


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

Key Specifications:

Powered Devices
Part Number IEEE Compliance RDS(ON)
PWM Protection Features Prog. UVLO Oper. Temp.
0.5 No
Programmable Inrush Current
UVLO Threshold = 35.4V
Yes -40 to +85 $1.90 @1k
Programmable Inrush Current
UVLO Threshold = 38.6V
See All Powered Devices (21)

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.


MAX5969A, MAX5969B: Typical Application Circuit
Typical Application Circuit

More Information

Topmark Coding MAX5969A
Topmark Coding MAX5969B
New Product Press Release   2010-02-18 ]

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Document Ref.: 19-5008 Rev 0; 2010-01-28
This page last modified: 2010-12-15