+72V SOT23/TDFN Simple Swapper Hot-Swap Controllers

Please check latest availability status for a specific part variant.


The MAX5902/MAX5903 are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane without causing a glitch on the power-supply rail. These devices operate from +9V to +72V and provide the simplest hot-swap solution by eliminating all external components except the external p-channel MOSFET.

The MAX5902/MAX5903 limit the inrush current to the load and provide a circuit-breaker function for overcurrent protection. During startup the circuit-breaker function is disabled and the MAX5902/MAX5903 limit the inrush current by gradually turning on the external MOSFET. Once the external MOSFET is fully enhanced, the circuit-breaker function is enabled and the MAX5902/MAX5903 provide overcurrent protection by monitoring the voltage drop across the external MOSFET's on-resistance.

The MAX5902/MAX5903 include an undervoltage lockout (UVLO) function, ON/active-low OFF control input, and a power-good status output, active-low PGOOD (MAX5902) or PGOOD (MAX5903). A built-in thermal shutdown feature is also included to protect the external MOSFET in case of overheating.

The MAX5902/MAX5903 offer latched or autoretry fault management and are available with 300mV, 400mV or 500mV circuit-breaker thresholds. Both the MAX5902 and MAX5903 are available in small SOT23 and TDFN packages, and are specified for the extended -40°C to +85°C temperature range. For specific ordering information, see the Selector Guide at the end of the data sheet.
MAX5902, MAX5903: Typical Operating Circuit MAX5902, MAX5903: Typical Operating Circuit Enlarge+

Key Features

  • Wide +9V to +72V Operation
  • Requires No External Sense Resistor
  • Drives External p-Channel MOSFET
  • Limits Inrush Current
  • Circuit-Breaker Function
  • Less than 2mA Quiescent Current
  • ON/Active-Low OFF Input Permits Load Power-Supply Control and Sequencing
  • Adjustable Undervoltage Lockout
  • Power-Good Output with +72V Rating
  • Latching or Automatic Retry Fault Management
  • Thermal Shutdown Helps Protect the External MOSFET
  • Available in Two Small Packages
    • 6-Pin TDFN and SOT23


  • Base-Station Line Cards
  • Industrial Systems
  • Network Hubs, Switches, Routers
  • Network Hubs, Switches, Routers
  • RAID
  • Servers
Part NumberVIN
Circuit Breaker/ Current LimitCircuit Breaker/Current Limit Threshold
Fault Condition ControlChannelsPositive/Negative RailFeaturesPackage/PinsBudgetary
minmaxSee Notes
MAX5902 972Circuit Breaker300 to 500
Latched Off
Periodic Retry
1PositiveRequires No RSENSE
$2.24 @1k
See All Hot Swap Controllers (49)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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