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In its datasheet there is no indication or explanation which diode to use. Datasheet page 10 have application circuit.I will use to regulate around 10-15 voltage to fix 5 volts. I chose B230A-13-F Schottky diode which has:

  • Voltage - DC Reverse (Vr) (Max):30v
  • Current - Average Rectified (Io) : 2A

Could you inform me if it is okay or not.

Datasheet link

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RdsOn on IC is 0.35 Ω and ESR on Diode is less so OK @ 0.1 Ω from VI curve slope.

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In an asynchronous buck converter, the catch diode needs to be rated for the full load current and input voltage. You have 50% margin on voltage and 25% margin on current. The diode you've selected should be fine.

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