LTC4280IUFD#PBF

LTC4280 is a Hot Swap™ controller. It allows 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 onboard ADC allow for monitoring of load current, voltage and fault status. This device features adjustable analogue foldback current limit and a FILTER pin which configures the time spent in overcurrent before declaring a fault. An I²C interface may configure the part to latch off or automatically restart after the device detects a current limit fault. 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 either automatically upon insertion or wait for an I²C command to turn on. It is widely used in applications such as live board insertion, electronic circuit breakers, computers, servers, platform management.

• 8bit ADC monitors current and voltage
• Wide operating voltage range from 2.9V to 15V
• Adjustable overcurrent filter time
• High side drive for external N-channel MOSFET
• No external gate capacitor required, input supply current is 3mA typ at (TA = 25°C, VDD = 12V)
• Input overvoltage/undervoltage protection
• Optional latch off or auto-retry after faults
• Alerts host after faults, inrush current limit with foldback
• Operating temperature range from -40°C to 85°C
• Package style is 24-lead plastic QFN

Notes

ADI products are only authorized (and sold) for use by the customer and are not to be resold or otherwise passed on to any third party