LDO: linear voltage regulator, only used for step-down, when the input and output voltage drop is too high, it will be consumed on the device itself, resulting in a certain energy loss. Advantages: low cost, low
peripheral, low noise, low quiescent current
Disadvantage: narrow voltage, low efficiency, buck only, low current (5A)
DCDC: DC to DC, Boost/buck
Advantages: wide voltage, high current, buck-boost, high efficiency, fast response
Disadvantages: high cost, high peripheral, high noise
Reference:
Difference between DCDC and LDO