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 thermal shutdown circuitry in an IC prevents the junction temperature from rising high enough to damage the part (see Figure 7). This is accomplished by monitoring the die temperature and reducing internal power dissipation to hold the temperature at the limiting value (usually about 160°C).
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