Power supply circuit with a voltage selector
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United States of America Patent
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May 20, 2003
Grant Date -
N/A
app pub date -
Aug 28, 2000
filing date -
Aug 31, 1999
priority date (Note) -
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Abstract
A power supply circuit receiving several supply voltages on respective switches, at least one of the switches being a first PMOS transistor connected between one of the supply voltages and a common output terminal, this switch being associated with a second PMOS transistor connected between the gate of the first transistor and a power supply node maintained at the highest of the other supply voltages, with a third NMOS transistor, which is less conductive in the on state than the second transistor, connected between the gate of the first transistor and the ground, and with a fourth PMOS transistor having its source connected to the power supply line of the switch and its drain connected to ground via a current source, and to the gates of the second, third, and fourth transistors.
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