dropout voltage may be higher. For applications where the input voltage may
come even closer than 1.8–2.5VDC to the output voltage, a low dropout regu-
latoris recommended. This topology utilizes a PNP pass transistor, which now
derives its base-emitter voltage from the output voltage instead of the head-
room or input voltage (see Figure 2–2b). This allows the regulator to have a
dropout voltage of 0.6VDC minimum. P-Channel MOSFETs can also be used
in this function and can exhibit dropout voltages close to zero volts.
The dropout voltage becomes a driving issue when the input to the linear
regulator during normal operation is allowed to fall close ...
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