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LMR51440: Low-side external diode for synchronous buck converter - LMR514x0

Part Number: LMR51440
Other Parts Discussed in Thread: LMR51450,

Tool/software:

Hi,

In the LMR51450 EVB, there's preparation for D1 (Diodes Inc 1N5819HW-7-F, Diode, Schottky, 40 V, 1 A, SOD-123) from GND to the SW node, but it is not assembled.

Do you have any app notes / recommendations / guidelines to designs in which D1 should be populated? I could not find anything on the LMR514x0 datasheet.

How is using D1 improving the buck's performance?

What should be the diode's specifications?

General information is useful, but I am asking specifically about design around LMR51440.

Thank you.