Understanding the IRS10752 Datasheet
C_GD2 is called the &quot;bootstrap&quot; capacitor. When the MOSFET is off it charges up to VCC&lt;-&gt;Source voltage trough bootstrap diode D_GD1. When the MOSFET has to turn on the chip will connect VB to HO, effectively putting the charged capacitor in parallel with the MOSFET gate-source. As the MOSFET turns on the source begins to rise towards V_BAT(x)_BUS, but because the capacitor is referenced to the source it &quot;rides up&quot; along with the source voltage, so the gate is always at source+C_GD2 voltage, which keeps the MOSFET fully turned on. Since VB is now at a higher voltage then VCC the function of diode D_GD1 should be clear.
Note that in such a circuit the MOSFET should be turned off periodically to give the bootstrap capacitor a chance to recharge, it can not be used to keep the MOSFET on indefinitely.
C_GD1 is indeed just a regular bypass cap for the chip's power supply.
R_GD1 is usually added to prevent ringing due to parasitic elements in the gate drive circuit. It slows transition times and damps oscillations.