Boost capacitor sizing, gate driver LM5106 used with N-MOSFET IPP075N15N3 G
The LM5106 uses the \$Q_g(max)\$ term from the FET datasheet (see section 8.2.1 of the LM5106 datasheet)

From the datasheet for the CSD18531Q5A MOSFET referenced:



As you can see, this is the total (maximum) gate charge.

\$Q_gs(max)\$ is sometimes used as a synonym for \$Q_g(max)\$ (somewhat confusingly)