Features and Benefits

  • Allows Safe Insertion into Live CompactPCI or PCI Express Backplane
  • 8-Bit ADC Monitors Current and Voltage
  • I2C/SMBus Interface
  • dI/dt Controlled Soft Start
  • Simultaneous or Sequenced Turn-On
  • ±20V Absolute Maximum Rating for ±12V Supplies
  • No External Gate Capacitor Required
  • Dual-Level Circuit Breaker and Current Limit
  • Bus Precharge Output
  • Power Good Input with Timeout
  • Optional Latch-off or Autoretry After Faults
  • Alerts Host After Faults
  • Integrated LOCAL_PCI_RST# Logic
  • 36-Pin SSOP and 38-Pin (5mm × 7mm) QFN Packages

Product Details

The LTC4245 Hot Swap controller allows a board to be safely inserted and removed from a live backplane in multiple supply systems such as CompactPCI and PCI Express. Using four external N-channel pass transistors, the board supply voltages can be ramped up at an adjustable rate and in any desired sequence. An I2C interface and on-board ADC allow monitoring of board current, voltage and fault status for each supply.

The device features adjustable dI/dt controlled soft start and foldback limited inrush current. A dual-level timed circuit breaker and fast current limit protect each supply against overcurrent faults. A power good input with timeout allows a downstream supply monitor to disconnect the board supplies. The device can be configured to function without a –12V supply or with an extra 3.3V supply instead of a 5V supply.

The controller has additional features to interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a load card and power-up in either the on or off state.


  • Live Board Insertion
  • CompactPCI, CompactPCI Express, CompactTCA, PCI Express Systems

Product Lifecycle icon-not-recommended Last Time Buy

All products in this family will be obsolete soon. Please contact ADI Sales or Distributors to arrange for final purchases and read our Obsolescence Information to review the time periods for placing final orders and receiving final shipments.

Evaluation Kits (1)

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Linduino code repository on GitHub and instructions on how to use the code.

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Reference Designs (1)

Product Recommendations

LTC4245 Companion Parts

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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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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.