A linear power supply (1) includes a P-channel (or PNP) first output transistor (10) connected between an input terminal of an input voltage (Vin) and an output terminal of an output voltage (Vout), an N-channel (or NPN) second output transistor (20) connected in parallel to the first output transistor (10), and a control circuit (30) that switches between a first mode and a second mode according to the input voltage (Vin), in which the first mode uses the first output transistor (10) while the second mode uses the second output transistor (20) as an output transistor that generates the output voltage (Vout) from the input voltage (Vin).

A multiphase power converter and a corresponding method is presented. The multiphase power converter contains a first and a second constituent switched-mode power converter. The first constituent switched-mode power converter provides, both in a first mode of operation and in a second mode of operation, a first phase current to an output of the converter. The second constituent switched-mode power converter provides, in the second mode, a second phase current to the output of the converter. The converter switches, depending on an operation condition of the converter, between the first mode and the second mode. A first transconductance of the first constituent switched-mode power converter is adapted when switching between the first mode and the second mode. By adapting the first transconductance, unsteadiness of the output voltage of the converter occurring during the switching between both modes of operation is minimized.

A multiphase power converter and a corresponding method is presented. The multiphase power converter contains a first and a second constituent switched-mode power converter. The first constituent switched-mode power converter provides, both in a first mode of operation and in a second mode of operation, a first phase current to an output of the converter. The second constituent switched-mode power converter provides, in the second mode, a second phase current to the output of the converter. The converter switches, depending on an operation condition of the converter, between the first mode and the second mode. A first transconductance of the first constituent switched-mode power converter is adapted when switching between the first mode and the second mode. By adapting the first transconductance, unsteadiness of the output voltage of the converter occurring during the switching between both modes of operation is minimized.

A semiconductor device includes an amplifier, a pass transistor, a compensation circuit, and a bias voltage generator. The amplifier has an output terminal. The pass transistor has a gate and an output terminal. The gate is coupled to the output terminal of the amplifier, and the output terminal of the pass transistor is coupled to a load. The compensation circuit is coupled between the output terminal of the amplifier and the output terminal of the pass transistor. The compensation circuit has a variable impedance. The bias voltage generator is coupled between the output terminal of the pass transistor and the compensation circuit.

Voltage source circuits, asynchronous processing systems and methods are disclosed. A voltage source circuit includes a capacitor storing an operating voltage for an asynchronous processor. A frequency comparator compares a frequency reference and a feedback signal indicative of an operating frequency of the asynchronous processor to determine whether or not the operating frequency is less than a target frequency. When operating frequency is less than the target frequency, a charge pump adds charge to the capacitor.

The present disclosure provides a control circuit operating in a pulse skip mode (PSM) and a voltage converter having the same, which adaptively adjust the related values in PSM through a pulse skip circuit. More specifically, the pulse skip circuit adaptively adjusts a second comparator signal indicating a second signal (related to a feedback signal with a lower gain) and/or indirectly adjusts a first comparator signal indicating a first signal (related to a feedback signal with a higher gain) to adaptively adjust the on-time of a high-side switch and the on-time of a low-side switch during PSM, thereby reducing the output current ripple.

A system that includes a regulator circuit is disclosed. The regulator circuit includes first and second phase units whose outputs are coupled to a power supply node of a circuit block, via respective coupled inductors. The first phase unit may initiate a charge cycle of the power supply node in response to assertion of a clock signal and generate a compensated current using currents measure through both inductors and the clock signal. In response to a determination that the compensated current is greater than a demand current generated using a voltage level of the power supply node and a reference voltage, the first phase unit may halt the charge cycle.

A step-up/down power supply, in which a circuit area is small, includes a step-down unit that generates an output voltage lower than an input voltage by turning on or off a step-down switch in which the input voltage of the step-up/down power supply is applied, and a step-up unit that generates an output voltage higher than the input voltage by turning on or off a step-up switch in which a ground is applied. A step-down gate voltage control circuit controls a gate voltage of the step-down switch and includes a gate voltage generating circuit that generates a first voltage and a second voltage for turning on the step-down switch. A gate voltage switching circuit switches between the first voltage and the second voltage, and the gate voltage generating circuit includes a first voltage source that generates the first voltage and a second voltage source that generates the second voltage.

A step-up/down power supply, in which a circuit area is small, includes a step-down unit that generates an output voltage lower than an input voltage by turning on or off a step-down switch in which the input voltage of the step-up/down power supply is applied, and a step-up unit that generates an output voltage higher than the input voltage by turning on or off a step-up switch in which a ground is applied. A step-down gate voltage control circuit controls a gate voltage of the step-down switch and includes a gate voltage generating circuit that generates a first voltage and a second voltage for turning on the step-down switch. A gate voltage switching circuit switches between the first voltage and the second voltage, and the gate voltage generating circuit includes a first voltage source that generates the first voltage and a second voltage source that generates the second voltage.

The invention provides a power conversion device, including: a voltage conversion stage, including a primary side for receiving a rectified voltage and a secondary side for generating a rectified voltage according to the rectified voltage, wherein the primary side includes a primary side switch; a switch control circuit having a startup status and a normal operation status, the switch control circuit being configured to operably provide a control signal to a control terminal of the primary side switch; a startup circuit, providing a current to the control terminal when the switch control circuit is in the startup status, to at least partially conduct the primary side switch; and a slow soft-startup circuit, wherein when the switch control circuit is in the startup status and the output voltage does not reach a predetermined voltage in a first predetermined time period, the slow soft-startup circuit reduces a total current quantity supplied to the control terminal in a second predetermined time period which is after the first predetermined time period.