Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1997-08-22
2000-02-29
Wong, Peter S.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323307, 323274, 307 10, G05F 500, H02P 930
Patent
active
060313633
ABSTRACT:
A voltage regulator which has two regulation circuits and a comparator for controlling the two regulation circuits is disclosed. The input of the comparator is connected to a power supply voltage such that the output of the comparator changes states when the power supply voltage reaches a predetermined voltage of around 8 volts. The first regulation circuit is enabled to provide the Vcc from the battery voltage until the power supply voltage reaches around 8 volts which is when the comparator changes states. At that point, the first regulation is disabled and the second regulation circuit is enabled to provide the Vcc voltage from the power supply voltage. Since the power supply voltage never reaches the load dump high voltages, the second pass transistors never gets exposed to a high voltage condition. Also, the first transistor can withstand higher voltages since its base is grounded.
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Belser Mitchell A.
Danstrom Eric J.
Edwards William E.
Galanthay Theodore E.
Jorgenson Lisa K.
Larson Renee M.
Patel Rajnikant B.
STMicroelectronics Inc.
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