In the application circuit, there is only one 220nf capacitor between the BST and SW nodes. However, in MPSmart Model, there is a 20ohm resistor and a 1uf capacitor. I am curious about the purpose of the 20ohm resistor and whether it is necessary. Can we just use a 220nf capacitor instead? [image] …

MP2329 Bootstrap Resistor

MPSNow_Yu March 21, 2023, 12:02am 2

Hello,

Yes, you can just use 220nF cap. The resistor is to limit the inrush current and slow down the rise time.

Best Regards,
Yu