Wide input range, low output voltage power supply
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United States of America Patent
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May 8, 2018
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app pub date -
Aug 4, 2015
filing date -
Aug 4, 2014
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Abstract
This disclosure describes techniques for generating relatively low regulated power supply voltages over a relatively wide range of input voltages. The techniques for generating the regulated voltages may include using at least two different pass transistors to regulate an output voltage of a voltage regulator. Both the turn-on threshold voltage and the maximum drain-to-source voltage rating of the first pass transistor may be greater than the corresponding characteristics of the second pass transistor. Using two different pass transistors with two different turn-on threshold voltages and two different maximum drain-to-source voltage ratings may increase the range of voltages over which a voltage regulator can generate a relatively low output voltage relative to the range of voltages that would be allowable if a single type of pass transistor were used.
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