An electronic circuit includes a charge pump circuit, which includes a drive power supply; a flying capacitor; and a pump capacitor that is coupled in parallel to the drive power supply and the flying capacitor in response to a first control signal being in first state and is configured to receive charge from the flying capacitor to boost a pump voltage across the pump capacitor to a value that exceeds a drive voltage provided by the drive power supply responsive to a transition of the first control signal from the first state to a second state. The electronic circuit further includes a gate drive circuit coupled to the charge pump circuit.

A buck-boost switching regulator includes: a power switch circuit including an input switch unit and an output switch unit which switch a first terminal and a second terminal of an inductor for buck-boost conversion; at least one low dropout regulator correspondingly coupled to at least one output high side switch in the output switch unit to correspondingly convert at least one low dropout voltage into at least one output voltage; and a bypass control circuit configured to operably generate a bypass control signal according to a conversion voltage difference between the input voltage and the corresponding low dropout voltage; wherein when the corresponding conversion voltage difference is lower than a reference voltage, the bypass control signal controls a corresponding bypass switch to electrically connect the input voltage with the corresponding low dropout node.

A charge pump circuit includes a boost capacitor driven by a first clock signal and a bootstrap capacitor driven by a second clock signal. The first and second clock signals have different duty cycles, with the duty cycle of the second clock signal being smaller than the duty cycle of the first clock signal. An input transistor is coupled between an input node and a boost node coupled to the boost capacitor. The control terminal of the input transistor is coupled to the bootstrap capacitor. A bootstrap transistor coupled between the boost node and the control terminal of the input transistor is driven by a logical inverse of the first clock signal.

A voltage supply circuit and a method for controlling a voltage supply circuit are provided. The voltage supply circuit includes a positive charge pump stage that generates a positive voltage and a negative charge pump stage that generates a negative voltage. The voltage supply circuit also includes a control stage that compares a voltage representative of the negative voltage with a reference voltage and causes a slope of the positive voltage to decrease when the voltage representative of the negative voltage exceeds the reference voltage.

A charge pump circuit includes a first pump unit and a second pump unit. The first pump unit includes a first capacitor and a first transistor, and generates a first node voltage by using a clock signal. The second pump unit includes a second capacitor, a second transistor, and a third transistor, and generates a negative output voltage by using the first node voltage. The clock signal and the first node voltage are each toggled between a low-level voltage and a high-level voltage. A magnitude of an absolute value of the negative output voltage is greater than a magnitude of an absolute value of the high-level voltage of the clock signal. A body of the third transistor is electrically isolated from a body of the second transistor.

Some embodiments of the present disclosure provide a positive and negative voltage driving circuit. The positive and negative voltage driving circuit includes: a positive and negative voltage generating module and a control module. The positive and negative voltage generating module includes a switch module. The control module is configured to control a turn-off state and a turn-on state of the switch module to enable the positive and negative voltage generating module to output a positive voltage and a negative voltage to a stylus tip of an active stylus. The positive and negative voltage driving circuit of the embodiments of the present disclosure can significantly reduce the driving power consumption of the active stylus while ensuring driving effects.

A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes, two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first mode and a second mode when in use with two flying capacitors connected to the flying capacitor nodes, wherein at least the first mode corresponds to a bipolar output voltage of +/−3VV, +/−VV/5 or +/−VV/6.

A charge pump circuit includes a voltage output terminal, a flying capacitor, and a current source. The flying capacitor includes a first terminal coupled to the voltage output terminal, and a second terminal coupled to an output terminal of a drive circuit. The current source includes a first terminal coupled to the voltage output terminal, and a second terminal coupled to a power supply rail.

A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes, two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first mode and a second mode when in use with two flying capacitors connected to the flying capacitor nodes, wherein at least the first mode corresponds to a bipolar output voltage of +/−3VV, +/−VV/5 or +/−VV/6.

A bipolar output charge pump circuit having a network of switching paths for selectively connecting an input node and a reference node for connection to an input voltage, a first pair of output nodes and a second pair of output nodes, and two pairs of flying capacitor nodes, and a controller for controlling the switching of the network of switching paths. The controller is operable to control the network of switching paths when in use with two flying capacitors connected to the two pairs of flying capacitor nodes, to provide a first bipolar output voltage at the first pair of output nodes and a second bipolar output voltage at the second pair of bipolar output nodes.