I have a board that has components requiring both 5v and 3.3v supply. The unit is supposed to be powered from a 12v or 24v battery. Can anyone suggest such a dual output DC/DC converter? Needs to be PCB mounted and of course inexpensive... (and should preferable handle polarity changes in source). Apart from the above, if BOM cost is to be minimized, would it be better to build it from discretes or not worth the hassle?
Thanks!
Everything depends on the power requirements of EACH rail, it is often cheaper and simpler to get a DC/DC that can cope with the total power at
5V output and put a seperate LDO regulator to give 3V3 rail.If the item has NO other connection to anything else connected to 12V/24V battery then you could put a diode brdige in front.
IF any connection (including gnd) is tied back to the original supply then the best you can do is a blocking diode to stop current if reverse connected.
That all depends on
Power requirements Space - area and height available. Heat dissipation and many other factors you have not specified such as what is 'inexpensive' to you
What currents and how many do you want?
We have some 3A switching modules. They can be set at 1.8V, 2.5V, 3.3V or 5V.
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