What this gate driver does in a switching supply
The ADP3624ARDZ is a low-side gate driver from Analog Devices designed to drive N-channel MOSFETs in switching power converters, motor drives, and class-D audio amplifiers. It delivers 4A peak source and 4A peak sink current, with 10ns typical rise and fall times, which means it can charge and discharge the gate capacitance of a large MOSFET quickly enough to keep switching losses under control. The supply range spans 4.5V to 18V, so a 12V gate drive rail is right in the sweet spot.
