Product Details
Key Features
Applications/Uses
Simplified Block Diagram
Technical Docs
Data Sheet | Quad Network Power Controller for Power-Over-LAN | Sep 12, 2005 |
Support & Training
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Sampling:
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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
Description
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.
Technical Docs
Data Sheet | Quad Network Power Controller for Power-Over-LAN | Sep 12, 2005 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.