Here is an efficiency versus load current plot for the MAX25254 showing three efficiency curves at 12V, 24V, and 36V respectively:
MAX25254
Recommended for New Designs
The MAX25254/MAX25255 are small, synchronous dual buck converters with integrated high-side and lowside switches. The ICs are designed to deliver up to...
Datasheet
MAX25254 on Analog.com
Here is an efficiency versus load current plot for the MAX25254 showing three efficiency curves at 12V, 24V, and 36V respectively: