I used to solder those mini pcb buckconverters with castellated holes from aliexpress to my PCB designs. It simply saved me some trouble and costs for most of my thru hole designs. And for ~50 cents and 4 whole pads to solder it is a good trade imo.
I am changing some designs to SMD and I would prefer to simply make my own buck converter as that is easier with SMT assembly.
I find it really hard to find the right IC for this. Besides the point that JLCPCB’s website is horribly in finding anything, there are soo many buck converter chips.
I eventually chose the MT2499A because it is A). the design does not use those huge aluminum capacitors which JLCPCB does not have in their basic component list. And B). there is no need for a Schottky diode…
I made a symbol and copied the schematic of the datasheet.
(N.B. the 88k7 resistor is not in the basic part list )
Made the components
(dont min’d the wrong inductor 3D model)
This particular thing is to supply an MG90 servo motor and an attiny. But in general I would like this circuit to supply 2A without problems.
Are there any pointers to this design?
Also, did I take a decent chip or should I use a different one for a reason??
My 2nd choise is the TPS543. This one is in the basic part list, but requires ~200uF capacitor…