LTC4260 Datasheet

• Allows Safe Insertion into Live Backplane
• 8-Bit ADC Monitors Current and Voltage
• I²C^™/SMBus Interface
• Wide Operating Voltage Range: 8.5V to 80V
• High Side Drive for External N-Channel MOSFET
• Input Overvoltage/Undervoltage Protection
• Optional Latchoff or Autoretry After Faults
• Alerts Host After Faults
• Foldback Current Limiting
• Available in 24-Lead SO, 24-Lead Narrow SSOP and 32-Lead (5mm × 5mm) QFN Packages

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

The LTC4260 Hot Swap^™ controller allows a board to be safely inserted and removed from a live backplane. Using an external N-channel pass transistor, the board supply voltage can be ramped up at an adjustable rate. An I²C interface and onboard ADC allow monitoring of board current, voltage and fault status.

The device features adjustable analog foldback current limit with latch off or automatic restart after the LTC4260 remains in current limit beyond an adjustable time-out delay.

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.