Features and Benefits

  • Enables Safe Board Insertion and Removal from a Power Supply
  • 4µA Supply Current
  • 0.3µA Shutdown Current
  • Wide Operating Voltage Range: 2.7V to 36V
  • Reverse Supply Protection to –40V
  • Adjustable Analog Current Limit with Circuit Breaker
  • Automatic Retry or Latchoff on Current Fault
  • Overvoltage and Undervoltage Monitoring
  • Controls Single or Back-to-Back N-Channel MOSFETs
  • 12-Lead MSOP and 3mm × 3mm QFN Packages
  • AEC-Q100 Qualified for Automotive Applications

Product Details

The LTC4231 is a micropower Hot Swap controller that allows safe circuit board insertion and removal from a live power supply. An internal high side switch driver controls the gate of an external N-channel MOSFET. Back-to-back MOSFETs can be used for reverse supply protection down to –40V.

The LTC4231 provides a debounce delay and allows the GATE to be ramped up at an adjustable rate. After startup, the LTC4231's quiescent current drops to 4µA during normal operation with output active. UVL, UVH, OV and GNDSW monitor overvoltage and undervoltage periodically, keeping total quiescent current low. Pulling SHDN low shuts down the LTC4231 and quiescent current drops to 0.3µA.

During an overcurrent fault, the LTC4231 actively limits current while running an adjustable timer. The LTC4231-1 remains off after a current fault while the LTC4231-2 automatically reapplies power after a cool-down period.


  • Battery Powered Equipment
  • Solar Powered Systems
  • Portable Instruments
  • Automotive Battery Protection
  • Energy Harvesting

Product Lifecycle icon-recommended Recommended for New Designs

This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.

Evaluation Kits (2)

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Product Recommendations

LTC4231 Companion Parts

Recommended Related Parts

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.

PCN-PDN Information

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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.