Hi Ian,
It seems you are not using the newest LPC15xx user manual, please download it from this link:
https://www.nxp.com/docs/en/user-guide/UM10736.pdf
About "voltage Ladder can be separately powered down for applications only requiring the comparator function", I think it is register CMPn[VLADEN], you can find each comparator has this bit to control the voltage Ladder, I think when it is disabled, the according voltage Ladder is powered down.
Wish it helps you!
Have a great day,
Kerry
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