A load drive device for driving an electrical load includes high-side and low-side transistors, and a switch. When the load is driven, each of the high-side and low-side transistors operates in a first mode where each of the high-side and low-side transistors is fully tuned on or in a second mode where each of the high-side and low-side transistors is controlled so that a load current flowing through the load is constant. When the load is driven, there is a first state where the high-side transistor operates in the second mode and the low-side transistor operates in the first mode and a second state where the high-side transistor operates in the first mode and the low-side transistor operates in the second mode. The switch switches between the first and second states to distribute heat generation between the high-side and low-side transistors.