Features and Benefits

  • Safe Hot Swap for +1V to +13.2V Power Supplies with VIN1 or VIN2 > 2.7V
  • Independent On/Off Control for Each Channel
  • Internal Charge Pumps Generate n-Channel MOSFET Gate Drives
  • Inrush Current Regulated at Startup
  • Circuit-Breaker Function
  • Adjustable Circuit Breaker/Current-Limit Threshold from 25mV to 100mV
  • VariableSpeed/BiLevel Circuit Breaker Response
  • Autoretry or Latched Fault Management
  • Status Outputs Indicate Fault/Safe Condition
  • Output Undervoltage and Overvoltage Monitoring or Protection
  • Product Details

    The MAX5955 and MAX5956 are +1V to +13.2V dual hot-swap controllers with independent on/off control for complete protection of dual-supply systems. They allow the safe insertion and removal of circuit cards into live backplanes. The MAX5955 and MAX5956 operate down to 1V provided one of the inputs is above 2.7V.

    The discharged filter capacitors of the circuit card provide low impedance to the live backplane. High inrush currents from the backplane to the circuit card can burn up connectors and components, or momentarily collapse the backplane power supply leading to a system reset. The MAX5955 and MAX5956 hot-swap controllers prevent such problems by gradually ramping up the output voltage and regulating the current to a preset limit when the board is plugged in, allowing the system to stabilize safely. After the startup cycle is completed, two on-chip comparators provide VariableSpeed/BiLevel™ protection against short-circuit and overcurrent faults, as well as immunity against system noise and load transients. In the event of a fault condition, the load is disconnected. The MAX5955B and MAX5956B must be unlatched after a fault, and the MAX5955A and MAX5956A automatically restart after a fault.

    The MAX5955 and MAX5956 integrate an on-board charge pump to drive the gates of low-cost, external n-channel MOSFETs. The devices offer integrated features like startup current regulation and current glitch protection to eliminate external timing resistors and capacitors. These devices provide open-drain status outputs, an adjustable startup timer, and adjustable current limits. The MAX5955 provides output undervoltage/ overvoltage protection for each channel, while the MAX5956 provides undervoltage/overvoltage monitoring for each channel.

    The MAX5955 and MAX5956 are available in a space-saving 16-pin QSOP package.


    • Base Station Line Cards
    • Hot Plug-In Daughter Cards
    • Network Switches, Routers, Hubs
    • Portable Computer Device Bays (Docking Stations)
    • Power-Supply Sequencing
    • RAID
    • Solid-State Circuit Breakers

    Product Lifecycle icon-recommended Production

    At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

    Design Resources

    ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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