DC booster chip usually has PWM, PWF and charge pump three kinds. A DC-DC device CS5171 or CS5173 is recommended. The input voltage range of the model device is 2.7V~30V, which can achieve boost, step-down and reverse phase, and can also achieve symmetrical positive and negative dual power output, the output voltage range is 1.28V~40V, the maximum output current is 1.5A, SO-8 package.