Semiconductor integrated circuit and method for operating the same

A method for operating a semiconductor integrated circuit comprising a high-side switch element, a low-side switch element, and a controller,

• wherein an input voltage can be supplied to one end of the high-side switch element via a decoupling inductor, other end of the high-side switch element and one end of the low-side switch element are coupled to a switching node, and other end of the low-side switch element can be coupled to an earth potential,
• wherein the controller can drive the high-side switch element in an on-state and an off-state,
• wherein the switching node can be coupled to a low pass filter including a smoothing inductor and a smoothing capacitor,
• wherein a decoupling capacitor can be coupled between the one end of the high-side switch element and the earth potential,
• wherein the high-side switch element includes a first transistor and a second transistor whose current paths are coupled in parallel between the one end of the high-side switch element and the other end of the high-side switch element,
• wherein in changing the state between the one end of the high-side switch element and the other end of the high-side switch element from an on-state to an off-state, the controller controls the second transistor from the on-state to the off-state by delaying the second transistor relative to the first transistor,
• wherein each transistor of the first transistor and the second transistor is formed to be divided into a plurality of parts, inside a semiconductor chip, and
• wherein a plurality of partial first transistors formed by dividing the first transistor and a plurality of partial second transistors formed by dividing the second transistor are alternately arranged in an arrangement direction of the first transistor and the second transistor, inside the semiconductor chip.