I’m seeing conflicting information on what to do with the NC pins (5,6,8) on a MP9488.
One place in the data sheet says to no-connect them, but the layout section seems to say to connect them to Vin for thermal performance improvement.
Here’s the layout section of the datasheet;
here’s the pin table from the datasheet;
and there was this comment in the forum;
can you please advise on what to do with pins 5,6,8 on MP9488 ?
Hello Tim,
For a case like this, it would be possible that the NC pins are floated. In this case, these pins may be used for purposes for thermal dissipation as suggested in the PCB layout guidelines that you have provided.
I have had customers use floated NC pins as connections to output power in order to help optimize the current carrying capacity for example. However, it would be first to test if this case by testing the circuit while treating this as such.
What I will do is check with some AEs who have worked on this IC in order to verify if the NC pins are indeed floated for the MP9488 and get back to you on this thread.
Best,
Krishan
please clarify the above.
is it acceptable to use pins 5,6,8 to connect to Vin (pin 7) on MP9488.
please be clear.
I have verified that the NC pins are floating when having a conversation about this subject with one of my colleagues and we looked at the EV9488 layout by looking how the NC pins are connected.
Not sure why it was recommended against in the older post, Bryan must have been being cautious. To speak generally, not all NC pins are actually not connected. However, in this case, they actually are.
Therefore, you should be ok with use NC (pins 5,6,8) to connect to Vin (pin 7). That’s as clear as it gets.
Best,
Krishan
