I'm looking at DC-DC IC's, and trying to understand the difference between a "converter" and "controller".

Would it be correct to say that a controller is simply a PWM, which requires more external electronics to be a full-fledged converter, while a "converter" IC integrates feedback and other electronics, including maybe even a power mosfet, into the IC to make a complete converter?

Would it also be correct to say that an original design with a controller and more discreet parts could be a lower BOM cost than a converter chip, but larger design effort?

Here's a controller
https://www.ti.com/lit/ds/symlink/lm3488.pdf

Here's a converter
https://www.ti.com/lit/ds/symlink/lm5157.pdf

 

Would it also be correct to say that an original design with a controller and more discreet parts could be a lower BOM cost than a converter chip, but larger design effort?

Not necessarily.
Depends upon the relative cost of the components.

 

The usual meaning is that the "Converter" includes the power device, but the "Controller" doesn't i.e it controls an external power device.
Converter = Controller + FET (and maybe diode)

 

Caution is needed in assigning classifications because different folks use different meanings for words. Some do it because they have no clue, others do it to confuse, and a few just speak a different language. AND , Ian0 is also correct.

 

Many components that used to be available in quantity one(1) from retail outlets are now unobtainable without a volume order. You literally cannot do what people used to be able to do for education and enjoyment.

 

Many components that used to be available in quantity one(1) from retail outlets are now unobtainable without a volume order. You literally cannot do what people used to be able to do for education and enjoyment.

Is that related specifically to my question about controllers and converters? Or just generally to all components?

 

Is that related specifically to my question about controllers and converters? Or just generally to all components?

It is particularly related to power supplies of all descriptions, since that used to be the de facto first project for most electronic enthusiasts. Since you mentioned the relationship of discrete parts to BOM cost I thought you were considering a decision on which way to go.

 

Used parts can be good for reducing the costs. Especially transformers and other big items like that.