It is possible for RO to be negative – an undesirable characteristic often caused by poor layout design in the regulator wiring resulting in inadvertent positive feedback. With negative output resistance the output voltage increases with the load current.
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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