Features and Benefits

  • Controls –12V, 3.3V, 5V and 12V Supplies
  • ±14.4V Absolute Maximum Rating for 12VIN and –12VIN Input Pins
  • Insensitive to Supply Voltage Transients
  • Adjustable Foldback Current Limit with Circuit Breaker
  • LOCAL_PCI_RST# Logic On-Chip
  • PRECHARGE Output Biases I/O Pins During Card Insertion and Extraction
  • LTC4244-1 Designed for Applications without –12V
  • Available in 20-Lead Narrow SSOP Package

Product Details

The LTC4244/LTC4244-1 are Hot Swap controllers that allow a board to be safely inserted into and removed from a CompactPCI bus slot. External N-channel transistors control the 5V and 3.3V supplies while on-chip switches control the ±12V supplies. The 3.3V and 5V supplies can be ramped up at an adjustable rate. Electronic circuit breakers protect all four supplies against overcurrent faults. After the power-up cycle is complete, the TIMER pin capacitor serves as auxiliary VCC allowing the LTC4244/LTC4244-1 to function without interruption in the presence of voltage spikes on the 12VIN supply. The PWRGD output indicates when all four supplies are within tolerance. The OFF/ON pin is used to cycle board power or reset the circuit breaker. The PRECHARGE output can be used to bias the bus I/O pins during card insertion and extraction. PCI_RST# is combined on-chip with HEALTHY# in order to generate LOCAL_PCI_RST#.


  • Hot Board Insertion into CompactPCI Bus

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Product Recommendations

LTC4244 Companion Parts

Recommended Related Parts

Reference Materials

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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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