What buck converter?

[Darlington]

I would like to use a buck converter such as the AP63205 to power an ESP32-S3 with the WIFI part on and a MAX98357 class D amplifier with a 4Ohm load .
In your opinion, can the required current be easily handled by the converter?

[rteodor]

Just yesterday I tried it (AP63200) briefly. 24V to 5V, held at 0.5A easily, 88% efficiency.
I'll add some more load later and see how it goes. DS says 2A but I would not go that high as I did not take care of the thermal.

Seems like a good part, its just that soldering it is an ant masturbation challenge.

[Darlington]

I don't know if it is suitable to handle the loads I mentioned above, what do you think?
I would supply it with 12V input and an output voltage of 5V feeding the MAX98357.
An LDO would take the 5V and bring it to 3.3v to power ESP32.

Yes you are right that package is a challenge

[rteodor]

I don't know if it is suitable to handle the loads I mentioned above, what do you think?
I would supply it with 12V input and an output voltage of 5V feeding the MAX98357.
An LDO would take the 5V and bring it to 3.3v to power ESP32.

Yes you are right that package is a challenge

I read 3.2W for MAX98357 that would be 0.64A. Then there should be 100...200mA for WiFi on top of what ESP32 needs. It might need some cooper to keep it cool. Other than that I don't see why it would not work.

[Darlington]

Ok , but then what does this parameter refer to? I have attached it as a image.

[Siwastaja]

Ok , but then what does this parameter refer to? I have attached it as a image.

This means that the IC does not get damaged from 1.6A current applied to said pins, if every other condition is maintained. It does not tell anything about if the IC is operational in this state; it might enter protection mode, for example. Absolute maximum ratings rarely are good for operational design.

[rteodor]

Ok , but then what does this parameter refer to? I have attached it as a image.

That is probably for an overload. Take it as worst case. In normal use it is specified to deliver 3.2W on 4ohm load (+ efficiency loss specified as 8% on 8ohm).
AP6320x has current limiting (but I'we seen other converter failing even if it claimed the same).
All in all, by the spec it is good to go.

Just made a few more tests (crude alligator clips, awful long wires, fan cooled 10ohm/10W load resistors and 121gw thermocouple): with one resistor 465mA cca. 4degC increase on the chip. With a second resistor 842mA about 9degC increase.

[Darlington]

Just so you know, I also found an IC that is perhaps even more versatile than Texas.  The LMR51430. I take advantage of this topic to ask one more thing.
Does anyone know the value of FB1 and FB2 inductors in this schematic?