Yes, you can lay out an external power section with a nice meaty capacitor. It saves picking a VReg. Tips are as follows.
- Over-spec the regulator for external power, so you don’t have to worry about the power requirements changing.
- If you are involving high voltages, keeping it away from the main board is best. It is quite common for the power supply portion to be on a separate board anyway – makes for a more modular system that is easier to design or redesign.
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