Power supply circuit and power supply control method

An integrated circuit system comprising:

• a first chip comprising a first-stage voltage conversion circuit;
• an input end of the first-stage voltage conversion circuit coupled to a power supply node, the first-stage voltage conversion circuit being configured to
• convert a first voltage received at the input end into a second voltage, and
• output the second voltage from an output end of the first-stage voltage conversion circuit, the second voltage being less than the first voltage, and the second voltage being greater than or equal to 0.6 V and less than or equal to 1.3 V;
• a second chip comprising a second-stage voltage conversion circuit;
• and
• an input end of the second-stage voltage conversion circuit coupled to the output end of the first-stage voltage conversion circuit, the second-stage voltage conversion circuit being configured to
• convert the second voltage into a third voltage, and
• supply the third voltage to a load, wherein the third voltage is less than the second voltage, and a switching frequency of the second-stage voltage conversion circuit is greater than or equal to 30 MHz.

A power supply circuit comprising

• a film inductor comprising
• a magnetic core comprising a first magnetic film and a second magnetic film,
• an accommodation cavity disposed between the first magnetic film and the second magnetic film,
• a conductor located in the accommodation cavity,
• an insulating isolation film disposed on two sides of the conductor and located between the first magnetic film and the second magnetic film, the insulating isolation film being in contact with the first magnetic film and the second magnetic film,
• the first magnetic film and the second magnetic film each comprising a plurality of layers of magnetic sub-films and a plurality of layers of insulating sub-films,
• the magnetic sub-films and the insulating sub-films being alternately disposed in the first magnetic film,
• the magnetic sub-films and the insulating sub-films being alternately disposed in the second magnetic film;
• a capacitor coupled to a first end of the film inductor;
• a first switch;
• and
• a second switch coupled to a ground node, a second end of the film inductor being coupled to a common node between the first switch and the second switch, the power supply circuit being configured to
• convert a second voltage received at the first switch into a third voltage, the second voltage being greater than or equal to 0.6 V and less than or equal to 1.3 V, and
• supply the third voltage to a load, the third voltage being less than the second voltage, and switching frequencies of the first switch and the second switch are greater than or equal to 30 MHz.