Features and Benefits

  • Allows Safe Insertion into Live Backplane
  • 8-Bit ADC Monitors Current and Voltage
  • I2C/SMBus Interface
  • Wide Operating Voltage Range: 2.9V to 15V
  • dI/dt Controlled Soft-Start
  • Circuit Breaker Timeout: 20μs (LTC4215-1) or 420μs (LTC4215-3)
  • Three General Purpose Outputs
  • High Side Drive for External N-channel MOSFET
  • No External Gate Capacitor Required
  • Input Overvoltage/Undervoltage Protection
  • Optional Latch-off or Auto-Retry After Faults
  • Alerts Host After Faults
  • Inrush Current Limit with Foldback
  • Available in 24-Pin (4mm × 5mm) QFN

Product Details

The LTC4215-1/LTC4215-3 Hot Swap controllers allow a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, board supply

voltage and inrush current are ramped up at an adjustable rate. An I2C interface and on-board ADC allow for monitoring of load current, voltage and fault status.

The device features adjustable foldback current limit and a soft-start pin that sets the dI/dt of the inrush current. An I2C interface may configure the part to latch-off or automatically restart after the LTC4215-1/LTC4215-3 detect a current limit fault.

The controller has additional features to interrupt the host when a fault has occurred, provide three general purpose outputs, notify when output power is good, detect insertion of a load card, and power-up either automatically upon insertion or wait for an I2C command to turn on.

The LTC4215-1 has a 20μs circuit breaker filter for applications that require a fast fault response time. The LTC4215-3 has an extended 420μs circuit breaker filter for applications where supply transients may exceed 20μs.

Circuit Breaker Timeout General Purpose Outputs
LTC4215 20μs 1
LTC4215-1 20μs 3
LTC4215-2 420μs 1
LTC4215-3 420μs 3


  • Live Board Insertion
  • Electronic Circuit Breakers
  • Computers, Servers
  • Platform Management

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 (1)

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Product Recommendations

LTC4215-1 Companion Parts

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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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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.