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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 Power-Sourcing Equipment (PSE) Power-Over-LAN/Power-Over-Ethernet Switches/Routers Midspan Power Injectors *Purchase of I 2C components from Maxim Integrated Products, Inc. or one of its sublicensed Associated Companies, conveys a license under the Philips I 2C Patent Rights to use these components in an I 2C system, provided that the system conforms to the I 2C Standard Specification as defined by Philips. Typical Operating Circuits appear at end of data sheet. MAX5945 31 OUT2 30 GATE2 29 SENSE2 28 VEE 27 OUT3 26 GATE3 25 SENSE3 24 OUT4 23 GATE4 22 SENSE4 21 AGND 20 SHD4 19 SHD3 A3 A2 A1 A0 10 DET1 11 DET2 12 DET3 13 DET4 14 DGND 15 VDD 16 SHD1 17 SHD2 18 SSOP ________________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. www.DataSheet4U.com Quad Network Power Controller for Power-Over-LAN MAX5945 ABSOLUTE MAXIMUM RATINGS (Voltages referenced to VEE, unless otherwise noted.) AGND, DGND, DET_, VDD, RESET, A3, A2, A1, A0, SHD_, OSC_IN, SCL, SDAIN, OUT_ and AUTO............-0.3V to +80V GATE_ (internally clamped, Note 1)....................-0.3V to +11.4V SENSE_ ..................................................................-0.3V to +24V VDD, RESET, A3, A2, A1, A0, SHD_, OSC_IN, SCL, SDAIN and AUTO to DGND ....................................................-0.3V to +7V INT and SDAOUT to DGND....................................-0.3V to +12V Maximum Current into INT, SDAOUT, DET_ .......................80mA Maximum Power Dissipation 36-Pin SSOP (derate 11.4mW/°C above +70°C) .........941mW Operating Temperature Ranges: MAX5945EAX ..................................................-40°C to +85°C MAX5945CAX .....................................................0°C to +70°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................


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