# Correct schottky diode selection

So I'm using the LMR16006 DC/DC converter which is suggesting to place a Schottky diode from the SW pin to ground with a voltage rating 25% higher than my input voltage, which is 50V. Hence, the voltage rating should be at least 62.5V. Datasheet: https://www.ti.com/lit/ds/symlink/lmr16006.pdf

How much would it matter if I would take, for instance, a 60V diode?

Then, I'm struggling with the current rating. For instance, I'm looking at components at DigiKey at this moment and I've made a list like this: https://www.digikey.nl/products/en/discrete-semiconductor-products/diodes-rectifiers-single/280?k=schottky+diod&k=&pkeyword=schottky+diod&sv=0&pv914=119750&pv914=167594&sf=0&FV=-8%7C280%2Cmu70V%7C2071&quantity=&ColumnSort=0&page=1&stock=1&cad=1&pageSize=25

The datasheet tells me: ", the current rating for the diode should be equal or greater to the maximum output current for best reliability in most applications". Does this comply with the "Current - Average Rectified (Io)" in the list I obtained above? What does a higher or lower current mean in the application?

I assume an output current of 700mA in my system.

As I'm learning, I truly like some explanations on value choices

I've included a schematic in which D1 is the diode I'm talking about.

• What output voltage? Is it 5 volts? Jan 11, 2021 at 14:50
• Ah oops, forgot to mention... 5V
– Mart
Jan 11, 2021 at 14:51
• If the maximum load current is 700 mA, given the low duty cycle (60 volts input) then the diode should be continuously rated in excess of 700 mA by at least 30" for reliable long term operation. So you should be aiming for at least a 1 amp diode. Jan 11, 2021 at 14:54
• what's the meaning of ", seconds? How do you obtain the 1Amp if the output current is .7 amps?
– Mart
Jan 11, 2021 at 15:04
• I meant to write % and not " Jan 11, 2021 at 15:18