Changing the Design
If you want to change the design to operate for your specific use case please consult the list below. These are some issues and general notes I have noticed.
While the list doesn't encompass every problem. If you encounter an issue while modifying the design the list below could help.
LM2679
If you have a specific output voltage for your use case. Then the efficiency can be boosted by sending in a lower voltage. Generally the higher voltage difference the lower efficiency and a lower output voltage hurts efficiency even if the difference remains the same.
TPS54560
The mosfet switching generates a lot of heat. This is important if your PCB is simple. If the PCB lacks a ground plane then tuning the TPS switching frequency is a must.
The mosfet switching generates a lot of heat. This is important if your PCB is simple. If the PCB lacks a ground plane then tuning the TPS switching frequency is a must.