Other Parts Discussed in Thread: TPS2412
We are using the UCC29002 and TPS2412 in a load share / hot swap application. Looking into the forum this seems to be a common application.
Now I'm wondering how to deal with the LS pin maximum rating. The datasheet states -0.3V to Vdd. In a situation where only one power module is supplied the UCC29002 of the inactive power module is no longer supplied via it's Vdd pin. This is because the MOSFET connected to the TPS2412 blocks any current from the output voltage rail. I measured about 2V at the UCC29002's Vdd pin. The LS pin goes up to 5V and is violating the max rating by far. There is no internal clamping to prevent the LS pin from rising above Vdd, which is good, because otherwise the active load share controller might go into protect mode.
I'm now asking for confirmation that the maximum rating in the datasheet is incorrect and the LS pin is allowed to rise up to 6V.or even 13.5V when Vdd=0V.
