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.
Many of the new LDO regulators are optimized for low quiescent current (like 75 to 150 mA), and provide significant improvement over typical regulators which draw several milliamps.
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