Low dropout voltage regulator using a depletion pass transistor

Details Low dropout voltage regulator using a depletion pass transistor Low dropout voltage regulator using a depletion pass transistor

2006-01-24

2006-01-24

Laxton, Gary L (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S275000, C323S316000

Reexamination Certificate

active

06989659

ABSTRACT:
A linear low dropout voltage regulator is described that makes use of a depletion mode NMOS pass transistor and of a PMOS transistor in series to the NMOS transistor and connected to its drain. The depletion NMOS transistor assures low dropout operations, while the series PMOS transistor allows the current regulation even under the condition of shorted load. The same PMOS transistor may be used to disable the current in the load without generating a negative voltage at the gate of the depletion pass transistor. This regulator is inherently stable without the need for an output capacitor in parallel to the load.

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