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High-Power, Quad, PSE Controller for Power-Over-Ethernet

Meets IEEE 802.3at Standard and Delivers Up to 45W for High-Power (POE+) PSE Applications

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • IEEE 802.3af Compliant/Pre-IEEE 802.3at Compatible
  • Instantaneous Readout of Port Current Through I²C Interface
  • High-Power Mode Enables Up to 45W Per Port
  • High-Capacitance Detection for Legacy Devices
  • Pin Compatible to MAX5945 and LTC4258/LTC4259A
  • Four Independent Power-Switch Controllers
  • PD Detection and Classification
  • Supports Both DC and AC Load Removal Detections
  • I²C-Compatible, 3-Wire Serial Interface
  • Current Foldback and Duty-Cycle-Controlled Current Limit
  • Open-Drain Active-Low INT Signal
  • Direct Fast Shutdown Control Capability

Applications/Uses

  • Midspan Power Injectors
  • Power-Sourcing Equipment (PSE)
  • Switches/Routers

Description

The MAX5952 is a quad -48V power controller designed for use in IEEE® 802.3af-compliant/pre-IEEE 802.3at-compatible power-sourcing equipment (PSE). This device provides powered device (PD) discovery, classification, current limit, DC and AC load disconnect detections in compliance with the IEEE 802.3af standard. The MAX5952 is pin compatible with MAX5945/LTC4258/LTC4259A PSE controllers and provides additional features.

The MAX5952 features high-power mode that provides up to 45W per port. The MAX5952 provides instantaneous readout of each port current through the I²C interface. The MAX5952 also provides high-capacitance detection for legacy PDs.

The device features an I²C-compatible, 3-wire serial interface, and is fully software configurable and programmable. The class-overcurrent detection function enables system power management to detect if a PD draws more than the allowable current. The MAX5952's extensive programmability enhances system flexibility, enables field diagnosis, and allows for uses in other applications.

The MAX5952 provides four operating modes to suit different system requirements. Auto mode allows the device to operate automatically without any software supervision. Semi-automatic mode automatically detects and classifies a device connected to a port after initial software activation, but does not power up that port until instructed to by software. Manual mode allows total software control of the device and is useful for system diagnostics. Shutdown mode terminates all activities and securely turns off power to the ports.

The MAX5952 provides input undervoltage lockout (UVLO), input undervoltage detection, input overvoltage lockout, overtemperature detection, output voltage slew-rate limit during startup, power-good status, and fault status. The MAX5952's programmability includes startup timeout, overcurrent timeout, and load-disconnect detection timeout.

The MAX5952 is available in a 36-pin SSOP package and is rated for both extended (-40°C to +85°C) and upper commercial (0°C to +85°C) temperature ranges.

Simplified Block Diagram

MAX5952: Typical Operating Circuit MAX5952: Typical Operating Circuit 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 .