A voltage regulator and a corresponding method of regulating a voltage are presented. The voltage regulator includes an N-type power switch, an error amplifier, and a switch capacitor circuit. The switch capacitor circuit includes a first capacitor coupled to a network of switches, the switch capacitor circuit has a first port coupled to an output the error amplifier, a second port coupled to an output terminal of the power switch, and a third port coupled to a control terminal of the power switch. The switch capacitor circuit is iteratively operable between a first phase and a second phase. In the first phase the first port is coupled to ground via a path comprising the first capacitor, and in the second phase the second port is coupled to the third port via a path comprising the first capacitor. The voltage regulator may be implemented as a low dropout regulator.

A voltage regulator and a corresponding method of regulating a voltage are presented. The voltage regulator includes an N-type power switch, an error amplifier, and a switch capacitor circuit. The switch capacitor circuit includes a first capacitor coupled to a network of switches, the switch capacitor circuit has a first port coupled to an output the error amplifier, a second port coupled to an output terminal of the power switch, and a third port coupled to a control terminal of the power switch. The switch capacitor circuit is iteratively operable between a first phase and a second phase. In the first phase the first port is coupled to ground via a path comprising the first capacitor, and in the second phase the second port is coupled to the third port via a path comprising the first capacitor. The voltage regulator may be implemented as a low dropout regulator.

Certain aspects of the present disclosure provide a power supply system. The power supply system generally includes a first voltage regulator and a second voltage regulator, outputs of the first voltage regulator and the second voltage regulator being coupled to an output of the power supply system. The power supply system may also include a current balancer circuit configured to adjust an output current of the first voltage regulator based on determined headrooms of the first voltage regulator and the second voltage regulator.

Certain aspects of the present disclosure provide a power supply system. The power supply system generally includes a first voltage regulator and a second voltage regulator, outputs of the first voltage regulator and the second voltage regulator being coupled to an output of the power supply system. The power supply system may also include a current balancer circuit configured to adjust an output current of the first voltage regulator based on determined headrooms of the first voltage regulator and the second voltage regulator.

An apparatus includes a voltage regulator coupled with a first voltage source, which supplies core memory circuitry. A first transistor is coupled between an output of the voltage regulator and input/output (I/O) circuitry. A second transistor is coupled between a second voltage source and the I/O circuitry, the second voltage source to power a set of I/O buffers. Control logic coupled with gates of the first and second transistors is to perform operations including: causing the second transistor to be activated to permit current to flow from the second voltage source to the I/O circuitry; in response to detecting a current draw from the I/O circuitry that satisfies a first threshold criterion, causing the first transistor to be activated; and causing the second transistor to be deactivated over a time interval during which the I/O circuitry is powered by the first voltage source and the second voltage source.

An apparatus includes a voltage regulator coupled with a first voltage source, which supplies core memory circuitry. A first transistor is coupled between an output of the voltage regulator and input/output (I/O) circuitry. A second transistor is coupled between a second voltage source and the I/O circuitry, the second voltage source to power a set of I/O buffers. Control logic coupled with gates of the first and second transistors is to perform operations including: causing the second transistor to be activated to permit current to flow from the second voltage source to the I/O circuitry; in response to detecting a current draw from the I/O circuitry that satisfies a first threshold criterion, causing the first transistor to be activated; and causing the second transistor to be deactivated over a time interval during which the I/O circuitry is powered by the first voltage source and the second voltage source.

The present disclosure relates to circuitry for selecting a bias voltage to output at a bias voltage output node of the circuitry. The circuitry comprises a first circuit node configured to receive a first voltage from a first, unregulated, voltage source and a second circuit node configured to receive a second voltage from a second, regulated, voltage source. A switch arrangement configured to selectively couple the bias voltage output node to the first circuit node or the second circuit node is also provided.

The present disclosure relates to circuitry for selecting a bias voltage to output at a bias voltage output node of the circuitry. The circuitry comprises a first circuit node configured to receive a first voltage from a first, unregulated, voltage source and a second circuit node configured to receive a second voltage from a second, regulated, voltage source. A switch arrangement configured to selectively couple the bias voltage output node to the first circuit node or the second circuit node is also provided.

The present disclosure provides a method for controlling a surgical instrument. The method includes connecting a power assembly to a control circuit, wherein the power assembly is configured to provide a source voltage, energizing, by the power assembly, a voltage boost convertor circuit configured to provide a set voltage greater than the source voltage, and energizing, by the voltage boost convertor, one or more voltage convertors configured to provide one or more operating voltages to one or more circuit components.

The present disclosure provides a method for controlling a surgical instrument. The method includes connecting a power assembly to a control circuit, wherein the power assembly is configured to provide a source voltage, energizing, by the power assembly, a voltage boost convertor circuit configured to provide a set voltage greater than the source voltage, and energizing, by the voltage boost convertor, one or more voltage convertors configured to provide one or more operating voltages to one or more circuit components.