Highvalue ceramic capacitor replacements (LM5176)

[24602]

Hello

Working on a device with a LM5176 converter, the output side capacitors need to be replaced.

The device has 4x capacitors in parallel on either side of the current shunt (8x total) (schematic screenshot attached)

The data sheet calls for 50uf on one side of the current shunt and 360uf on the other (typical schematic attached)

Ceramic capacitors at this rating are $10s of dollars each on the main suppliers @ 25V max rating. Output is 16V

The device will work in a buck/boost config as battery and external DC powered approx a couple of amps max

Are these expensive capacitors the best option?

[inse]

The datasheet does not exclusively call for ceramic caps: “a combination of ceramic and bulk capacitors is needed“
Polymer electrolytics provide low ESR as well and can be supported by ceramic caps.

[24602]

Would you suggest replacing them with one of these?

https://au.element14.com/nichicon/ucl1v471mnl1gs/cap-470-f-35v-radial-smd/dp/2309060

https://au.element14.com/panasonic/eeefp1v470ap/cap-47-f-35v-radial-smd-reel/dp/2408634

or would it be better to use with a lower value ceramic be beneficial for high freq? 

[inse]

Low ESR electrolytic supported by some uF ceramics -should- work.
A polymer aluminum electrolytic has even lower ESR, possibly you can skip the ceramic.
Check design requirements from datasheet and select components accordingly.
Allowable ripple current is stated in capacitor datasheets.