You have to see it to believe it, this step down power module is extremely compact and has all the features you will require for a low current step down application.
Conversion: Non-isolated step-down module (BUCK)
Rectification: Synchronous rectification
Input voltage: DC 4.75V-23V
Output voltage: DC 1.0V-17V (Adjustable, Output < Input)
Output current: Rated current 1.8A (3A MAX, pulsed)
Output ripple: 30mV (no-load)
Dimension: 17 x 11 x 4mm(L x W x H)