Continued proper operation of the LM5067 hot swap circuit requires capacitance be present on the supply side of the connector into which the hot swap circuit is plugged in, as depicted in Figure 8-1. The capacitor in the “Live Backplane” section is necessary to absorb the transient generated whenever the hot swap circuit shuts off the load current. If the capacitance is not present, inductance in the supply lines will generate a voltage transient at shut-off which can exceed the absolute maximum rating of the LM5067, resulting in its destruction.

If the load powered via the LM5067 hot swap circuit has inductive characteristics, a diode is required across the LM5067’s output to provide a recirculating path for the load’s current. Adding the diode prevents possible damage to the LM5067 as the OUT pin will be taken above ground by the inductive load at shutoff. See Figure 9-9

Figure 9-9 Output Diode Required for Inductive Loads