MAX5945

Quad Network Power Controller for Power-Over-LAN


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Description

The MAX5945 quad network power controller is designed for use in IEEE® 802.3af-compliant power-sourcing equipment (PSE). The device provides power devices (PD) discovery, classification, current-limit, and both DC and AC load disconnect detections. The MAX5945 can be used in either endpoint PSE (LAN switches/routers) or midspan PSE (power injector) applications.

The MAX5945 can operate autonomously or be controlled by software through an I²C-compatible interface. Separate input and output data lines (SDAIN and SDAOUT) allow usage with optocouplers. The MAX5945 is a slave device. Its four address inputs allow 16 unique MAX5945 addresses. A separate active-low INT output and four independent shutdown inputs (active-low SHD_) allow fast response from a fault to port shutdown. An active-low RESET input allows hardware reset of the device. A special watchdog feature allows the hardware to gracefully take over control if the software crashes. A cadence timing feature allows the MAX5945 to be used in midspan systems.

The MAX5945 is fully software configurable and programmable. A class-overcurrent detection function enables system power management to detect if a PD draws more current than the allowable amount for its class. Other features are input under/overvoltage lockout, overtemperature protection, output-voltage slew-rate limit during startup, power-good, and fault status. The MAX5945's programmability includes gate-charging current, current-limit threshold, startup timeout, overcurrent timeout, autorestart duty cycle, PD disconnect AC detection threshold, and PD disconnect detection timeout.

The MAX5945 is available in a 36-pin SSOP package and is rated for both extended (-40°C to +85°C) and commercial (0°C to +70°C) temperature ranges.
MAX5945: Typical Operating Circuit MAX5945: Typical Operating Circuit Enlarge+

Key Features

  • IEEE 802.3af Compliant
  • Controls Four Independent, -48V-Powered Ethernet Ports in Either Endpoint or Midspan PSE Applications
  • Wide Digital Power Input, VDIG, Common-Mode Range: VEE to (AGND + 7.7V)
  • PD Violation of Class Current Protection
  • PD Detection and Classification
  • Provides Both DC and AC Load Removal Detections
  • I²C-Compatible, 3-Wire Serial Interface
  • Fully Programmable and Configurable Operation Through I²C Interface
  • Current Foldback and Duty-Cycle-Controlled/Programmable Current Limit
  • Short-Circuit Protection with Fast Gate Pulldown
  • Direct Fast Shutdown Control Capability
  • Programmable Direct Interrupt Output
  • Watchdog Mode Enable Hardware Graceful Takeover

Applications/Uses

  • Midspan Power Injector
  • Power-Over-LAN/Power-Over-Ethernet
  • Power-Sourcing Equipment (PSE)
  • Switches/Routers

MAX5945EVKIT: Evaluation Kit/Evaluation System for the MAX5945
MAX5945EVSYS: Evaluation Kit/Evaluation System for the MAX5945
Product Reliability Reports: MAX5945.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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