In-rush current control for a low drop-out voltage regulator

A method and circuit are shown for controlling an in-rush current to a voltage regulator circuit. A sense transistor is coupled in parallel with a pass transistor of the voltage regulator circuit and used to monitor the current through the pass transistor. A sense current through the sense transisto...

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1. Verfasser: PARDOEN MATTHIJS D
Format: Patent
Sprache:eng
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Zusammenfassung:A method and circuit are shown for controlling an in-rush current to a voltage regulator circuit. A sense transistor is coupled in parallel with a pass transistor of the voltage regulator circuit and used to monitor the current through the pass transistor. A sense current through the sense transistor is converted to a voltage signal and input to an amplifier along with a ramping voltage signal generated in response to a circuit activation signal. An output of the amplifier drives a control gate of a current source that sources current to gate terminals of both the pass transistor and the sense transistor. A limiting circuit also monitors the sense current and sinks current from the control terminal of the current source in order to limit a maximum current through the pass transistor.