-100V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers

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The MAX5900/MAX5901 are SOT23/TDFN 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 -100V and provide the simplest hot-swap solution by eliminating all external components except an external n-channel MOSFET.

The MAX5900/MAX5901 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 MAX5900/MAX5901 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 MAX5900/MAX5901 provide overcurrent protection by monitoring the voltage drop across the external MOSFET's on-resistance.

The MAX5900/MAX5901 include an undervoltage lockout (UVLO) function, ON/active-low OFF control input, and a powergood status output, active-low PGOOD (MAX5900) or PGOOD (MAX5901). A built-in thermal shutdown feature is also included to protect the external MOSFET in case of overheating.

The MAX5900/MAX5901 offer latched or autoretry fault management and are available with 200mV, 300mV, or 400mV circuit-breaker thresholds. Both the MAX5900 and MAX5901 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.
MAX5900, MAX5901: Typical Operating Circuit MAX5900, MAX5901: Typical Operating Circuit Enlarge+

Key Features

  • Wide -9V to -100V Operation
  • Requires No External Sense Resistor
  • Drives External N-Channel MOSFET
  • Limits Inrush Current
  • Circuit-Breaker Function
  • Less than 1mA Quiescent Current
  • ON/Active-Low OFF Input Permits Load Power-Supply Control and Sequencing
  • Adjustable Undervoltage Lockout
  • Power-Good Output with 100V Rating
  • Latching or Automatic Retry Fault Management
  • Thermal Shutdown Helps Protect the External MOSFET
  • Space-Saving 6-Pin SOT23 and TDFN Packages


  • Base-Station Line Cards
  • Network Hubs, Switches, Routers
  • Servers
  • Telecom Line Cards
Part NumberVIN
Circuit Breaker/ Current LimitCircuit Breaker/Current Limit Threshold
Fault Condition ControlChannelsPositive/Negative RailFeaturesPackage/PinsBudgetary
minmaxSee Notes
MAX5900 -9-100Circuit Breaker200 to 400
Latched Off
Periodic Retry
1NegativeRequires No RSENSE
$2.06 @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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