The LDO regulator is best suited for battery-powered applications, because the lower dropout voltage translates directly into cost savings by reducing the number of battery cells required to provide a regulated output voltage. If the input-output voltage differential is low (like 1V to 2V) the LDO is more efficient than a Standard regulator because of reduced power dissipation resulting from the load current multiplied times the input-output voltage differential.
The ground pin current in an LDO regulator is approximately equal to the load current divided by the gain of the single PNP transistor. Consequently, the ground pin current of an LDO is the highest of the three types.
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