Unidentified step-down converter IC

[krykoz]

Hi everyone,
I'm repairing an Advantech' data acquisition module and I found burnt IC which I can't identify. It's step-down converter in SOP-4 package, with three external components: diode, inductor and capacitor in feedback branch. Please find photos attached. Does anybody have an idea what IC is it? Input voltage is probably up to 30 V, output 5 V fixed.

 

[KlausST]

Hi,

It doesn't look like an SMPS IC to me ...
Rather like an optocoupler.

But as with all other "identify this IC" threads: we need more context. Photos of the PCB, so we can see the traces and the electronic parts around.

Klaus

 

[tepalia02]

The name is quite similar to this: https://datasheetspdf.com/pdf-file/1257907/SHOUDING/SD8223LC/1

 

[betwixt]

Sanken SAI01 - it is a switcher and still available.

Brian.

 

[krykoz]

Sanken SAI01 - it is a switcher and still available.

Brian.

Thank you for the help!