A voltage regulation loop includes a voltage reference generation block that includes a bandgap voltage reference circuit; a linear voltage regulator block that includes a first and second linear voltage regulators, wherein the first linear voltage regulator provides a first regulated power supply to the bandgap voltage reference circuit in the voltage reference generation block, and the second linear voltage regulator provides a second regulated power supply to a load; and a soft startup circuit connected between the voltage reference generation block and the linear voltage regulator block, wherein a selector functions with a control block to output a selected voltage reference to pass to the soft startup circuit, wherein the soft startup circuit smooths the selected voltage reference and produces a smoothed voltage reference to pass to the linear voltage regulator block to prevent overshoots at startup.

A voltage regulation loop includes a voltage reference generation block that includes a bandgap voltage reference circuit; a linear voltage regulator block that includes a first and second linear voltage regulators, wherein the first linear voltage regulator provides a first regulated power supply to the bandgap voltage reference circuit in the voltage reference generation block, and the second linear voltage regulator provides a second regulated power supply to a load; and a soft startup circuit connected between the voltage reference generation block and the linear voltage regulator block, wherein a selector functions with a control block to output a selected voltage reference to pass to the soft startup circuit, wherein the soft startup circuit smooths the selected voltage reference and produces a smoothed voltage reference to pass to the linear voltage regulator block to prevent overshoots at startup.

Provided are a reference source circuit, a chip, a power supply, and an electronic device. The circuit comprises: a first current generation unit used for generating first current; a reference voltage generation unit electrically connected to the first current generation unit and used for generating a band-gap reference voltage by using the first current; and a reference current generation unit electrically connected to the first current generation unit and the reference voltage generation unit and used for generating band-gap reference current by using the first current. By means of the circuit above, a band-gap reference voltage and band-gap reference current can be generated in a reference source circuit, and the first current generation unit may be reused, so that high-gain and simultaneous work of two loops can be achieved, the cost can be reduced, and the chip area can be saved as compared with the design of two separate reference sources.

Provided are a reference source circuit, a chip, a power supply, and an electronic device. The circuit comprises: a first current generation unit used for generating first current; a reference voltage generation unit electrically connected to the first current generation unit and used for generating a band-gap reference voltage by using the first current; and a reference current generation unit electrically connected to the first current generation unit and the reference voltage generation unit and used for generating band-gap reference current by using the first current. By means of the circuit above, a band-gap reference voltage and band-gap reference current can be generated in a reference source circuit, and the first current generation unit may be reused, so that high-gain and simultaneous work of two loops can be achieved, the cost can be reduced, and the chip area can be saved as compared with the design of two separate reference sources.

A power switch circuit includes an internal node; a first field-effect transistor including a first drain, a first gate and a first source; a second field-effect transistor including a second drain, a second gate and a second source, wherein the first drain is coupled to a voltage supply terminal, the first gate is coupled to the second source, the first source and the second drain are coupled to the internal node, and the second source is coupled to a ground; and a regulating circuit is coupled to the internal node, wherein the regulating circuit is configured to regulate a voltage value of the internal node after the power switch circuit is activated.

A power switch circuit includes an internal node; a first field-effect transistor including a first drain, a first gate and a first source; a second field-effect transistor including a second drain, a second gate and a second source, wherein the first drain is coupled to a voltage supply terminal, the first gate is coupled to the second source, the first source and the second drain are coupled to the internal node, and the second source is coupled to a ground; and a regulating circuit is coupled to the internal node, wherein the regulating circuit is configured to regulate a voltage value of the internal node after the power switch circuit is activated.

A power conversion system includes a power conversion circuit and a start circuit. The power conversion circuit includes a first terminal, a second terminal, an output capacitor, at least one switch unit, a flying capacitor and a magnetic element. The flying capacitor is connected between the first terminal and the second terminal. The output capacitor is electrically connected with the first terminal or the second terminal. The start circuit is configured to control the power conversion circuit to pre-charge. A first terminal of the start circuit is electrically connected with the first terminal, and a second terminal of the start circuit is electrically connected with the second terminal. During a start process of the power conversion circuit, the at least one flying capacitor and the output capacitor are pre-charged by the start circuit.

A power conversion system includes a power conversion circuit and a start circuit. The power conversion circuit includes a first terminal, a second terminal, an output capacitor, at least one switch unit, a flying capacitor and a magnetic element. The flying capacitor is connected between the first terminal and the second terminal. The output capacitor is electrically connected with the first terminal or the second terminal. The start circuit is configured to control the power conversion circuit to pre-charge. A first terminal of the start circuit is electrically connected with the first terminal, and a second terminal of the start circuit is electrically connected with the second terminal. During a start process of the power conversion circuit, the at least one flying capacitor and the output capacitor are pre-charged by the start circuit.

Disclosed herein is an apparatus that includes a first external terminal supplied with a first power potential, a second external terminal supplied with a second power potential different from the first power potential, a first transistor connected between the first external terminal and an internal power line, a second transistor connected between the second external terminal and the internal power line, and a first circuit configured to turn the first transistor OFF during at least a first period until the second power potential is supplied after the first power potential is supplied.

Disclosed herein is an apparatus that includes a first external terminal supplied with a first power potential, a second external terminal supplied with a second power potential different from the first power potential, a first transistor connected between the first external terminal and an internal power line, a second transistor connected between the second external terminal and the internal power line, and a first circuit configured to turn the first transistor OFF during at least a first period until the second power potential is supplied after the first power potential is supplied.