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MAX5945 Dataheets PDF



Part Number MAX5945
Manufacturers Maxim Integrated Products
Logo Maxim Integrated Products
Description Quad Network Power Controller
Datasheet MAX5945 DatasheetMAX5945 Datasheet (PDF)

19-3428; Rev 1; 9/05 www.DataSheet4U.com KIT ATION EVALU E L B A IL AVA Quad Network Power Controller for Power-Over-LAN Features ♦ IEEE 802.3af Compliant ♦ Pin and Function Compatible with LTC4259A ♦ 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 Detec.

  MAX5945   MAX5945



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19-3428; Rev 1; 9/05 www.DataSheet4U.com KIT ATION EVALU E L B A IL AVA Quad Network Power Controller for Power-Over-LAN Features ♦ IEEE 802.3af Compliant ♦ Pin and Function Compatible with LTC4259A ♦ 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-CycleControlled/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 General 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 is pin and function compatible with LTC4259A. 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 INT output and four independent shutdown inputs (SHD_) allow fast response from a fault to port shutdown. A 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, currentlimit 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 Ordering Information PART MAX5945CAX** MAX5945EAX TEMP RANGE 0°C to +70°C -40°C to +85°C PIN-PACKAGE 36 SSOP 36 SSOP **Future product—contact factory for availability. Pin Configuration TOP VIEW RESET MIDSPAN INT SCL SDAOUT SDAIN 1 2 3 4 5 6 7 8 9 36 OSC_IN 35 AUTO 34 OUT1 33 GATE1 32 SENSE1 Applications P.


AP1625 MAX5945 AT73C211


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