First of all, I want to state that I’m quite new to power converters design, so I apologize for any obvious mistakes.
I want to convert a 5V input source to 3.3V, and the MP2451 part was available in the catalog I’m looking. Reading through the datasheet, I found that it states it can do up to 0.8x Vin (=4V, or 3.6V if we allow 10% margin for the input), which fits. However, reading on, in the section about the bootstrap diode (page 12), it says it’s recommended for Vout/Vin > 0.65, which is the case. However, the bootstrap diode section also states that in this case, Vin must be at least Vout + 3V, which is not possible for my application. It also states some things about UVLO and programming throuhg the EN pin, but I’m not sure if I understand it.
What I want to know is: is it possible to use this chip to convert from 5V to 3.3V? If so, should I use the external bootstrap diode?
Again, I’m new to this kind of thing, and therefore please forgive any mistakes or lack of understanding from my part.