Voltage control method and electronic system

An electronic system comprising:

• a power management circuit comprising:
• a switched mode power supply generating a power supply voltage,
• wherein the power management circuit determines a plurality of voltage values at least comprising a first voltage value and enables a voltage adjustment mode of the switched mode power supply;
• a plurality of low dropout voltage regulators outputting a plurality of output voltages according to the power supply voltage for driving the plurality of user modules respectively;
• a plurality of user modules driven by the plurality of output voltages respectively;
• and
• a processor controlling the plurality of user modules to operate in a first operation scenario of the electronic system in response to the voltage adjustment mode,
• wherein in the voltage adjustment mode, the power management circuit operates to:
• determine whether one of the plurality of user modules enables a high-voltage requirement according to operation states of at least two of the plurality of user modules in the first operation scenario to generate a first determination signal,
• in response to the first determination signal indicating that one of the plurality of user modules enables the high-voltage requirement, control the switched mode power supply to generate the power supply voltage with the first voltage value, wherein the plurality of low dropout voltage regulators output a plurality of output voltages according to the power supply voltage for driving the plurality of user modules respectively, and
• in response to the first determination signal indicating that none of the plurality of user modules enables the high-voltage requirement, control the switched mode power supply to generate the power supply voltage with a voltage value of the plurality of voltage values that is less than the first voltage value.