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.
The maximum current that a linear regulator can supply to a load is specified on the data sheet. Many regulators (and most LDO regulators) specify only a single value of maximum current. This value is guaranteed for any input/output voltage within the maximum ratings for the part.
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