DC-DC converter, semiconductor device and display device

摘要

An object is to reduce power consumption of a semiconductor device including a DC-DC converter circuit. The semiconductor device includes a DC-DC converter circuit and a microprocessor. The DC-DC converter circuit includes a conversion circuit including an inductor and a transistor, and a control circuit including a comparison circuit and a logic circuit. A hysteresis comparator is used as the comparison circuit. In the control circuit, the comparison circuit compares an output signal of the conversion circuit with a first reference potential or a second reference potential, and the logic circuit performs arithmetic operation between an output signal of the comparison circuit and a clock signal of the microprocessor. In the conversion circuit, the transistor controls current flowing through the inductor in accordance with an output signal of the logic circuit, and the output signal of the conversion circuit is generated in accordance with the current flowing through the inductor.

主权项

1. A semiconductor device comprising a DC-DC converter circuit, the DC-DC converter circuit comprising:
a wiring; a conversion circuit comprising:
an inductor; anda transistor comprising a drain terminal and a source terminal, one of which is connected to the inductor; a hysteresis comparator comprising a first input terminal for a first reference potential, a second input terminal for a second reference potential, and a third input terminal electrically connected to an output terminal of the conversion circuit; and a logic circuit comprising a first input terminal electrically connected to an output terminal of the hysteresis comparator, a second input terminal electrically connected to the wiring, and an output terminal electrically connected to a gate of the transistor.