Assistance choosing switching buck converter?
, 01-05-2024, 01:28 PM
My board requires 5v @5amps. Using USB-C PD, I can get sufficient current starting at 9v or going up to 20v.I am looking for an easy to use, low part count, reasonable cost chip (switching, buck converter) that can provide the 5v @5a requirement.This will be my first board with a switching converter, so a simple design is what I am primarily looking for. Something to cut my teeth on, so to speak. Thank you for sharing your experience with a switching noob!Carl
QDrives , 01-05-2024, 08:47 PM
Simple design... but what other requirements?https://webench.ti.com/power-designer/switching-regulator?powerSupply=0
, 01-06-2024, 02:38 AM
QDrives, thank you for the reference to that tool. Very useful!Here are my requirements:SMPS, non-isolating, buck DC-DC Switching regulator/controllerInput: 9v to 20v (25 watts)Single Output: 5v (up to 5amp/25 watts)Surface Mount, not BGA.Synchronous, integrated MOSFETNegotiable, but ideally 90% or greater efficiencyNegotiable, but ideally $10 or lower BOM cost
, 01-06-2024, 02:38 AM
I am playing with the TI tool now. Thanks again!
Robert Feranec , 01-06-2024, 06:10 AM
for solutions where I use chips for a very first time often I select the chips based on how many they are in stock (e.g. in Digikey) as it may indicate popularity and future availability of the chip. Of course, it is not accurate, but there are not many ways how to guess if a chip is popular. So, I would just go to Digikey, filtered the search based on your parameters, ordered based on quantity in stock and went through the top chips to check their datasheet. Also, when filtering, I often select well known manufacturers, so for example in your case, I would only have a look at TI chips.
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