ADI LTC4245IUHF#PBF

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 onboard 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.

• 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 Latchoff or Autoretry After Faults
• Alerts Host After Faults
• Integrated LOCAL_PCI_RST# Logic
• 36-Pin SSOP and 38-Pin (5mm×7mm) QFN Packages

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