The DC-DC conversion chip and the voltage regulator belong to the power conversion chip, but the adjustment tube of the DC-DC conversion chip works in the light state. It can be divided into two types: buck type and boost type. Compared with voltage regulator, DC-DC conversion chip has higher efficiency, and larger ripple and open light frequency, which is suitable for power conversion with larger power. Common types: MP2314, TPS61030RSAR TPS5405DR, L4971