LTC4222

The LTC4222 Hot Swap™ controller allows two power paths to be safely inserted and removed from a live backplane.

Using external N-channel pass transistors, board supply voltages and inrush currents are ramped up at an adjustable rate. An I²C interface and onboard ADC of LTC4222 allows for monitoring of current, voltage and fault status for each channel.

The LTC4222 features adjustable, analog, foldback current limit circuits and a Soft-Start circuit that sets the dI/dt of the inrush currents. An I²C interface may confi gure the part to latch off or automatically restart after the LTC4222 detects a fault on either channel.

The controller LTC4222 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.