Patent ID: 6841980

Claim:
An apparatus for controlling voltage sequencing for a power supply having multiple switching regulators, said apparatus comprising: a first regulator for providing a positive output voltage at a positive voltage output; a second regulator for providing a negative output voltage at a negative voltage output; a first resistor and a second resistor connected in series between said positive and negative voltage outputs; and a first transistor and a second transistor connected in series between said positive and negative voltage outputs, wherein gates of said first and second transistors are connected to a node between said first and second resistors, wherein said first transistor turns on to limit said positive output voltage at said positive voltage output in response to a voltage at said node between said first and second resistors exceeds a predetermined positive voltage, wherein said second transistor turns on to limit said negative output voltage at said negative voltage output in response to a voltage at said node between said first and second resistors drops below a predetermined negative voltage.