SUPPLY SEQUENCE INDEPENDENT HIGH-VOLTAGE TOLERANT REGULATOR DISABLE CIRCUIT
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United States of America
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Issued Date -
Dec 12, 2024
app pub date -
Jun 9, 2023
filing date -
Jun 9, 2023
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Abstract
An example power management unit utilizing an example circuit to disable a voltage regulator is provided. The example circuit includes a voltage selection circuit and a power-down switching device. The voltage selection circuit configured to receive a first voltage source and a second voltage source to output a selected voltage based on the higher of the two input voltages. The voltage selection circuit utilizes a first transistor electrically connected in parallel with a second transistor between the first voltage source and the second voltage source to generate the selected voltage. The second transistor gate voltage at the second transistor gate is generated based at least in part on a voltage at the first transistor drain. The selected voltage is generated based on a voltage at the second transistor drain. The power-down switching device is configured to generate a voltage for a voltage regulator based on the selected voltage.
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