BP85221AL is a switching power supply driver chip with high performance, high integration and low standby power consumption. It is suitable for Buck and Buck-Boost topology applications with full voltage input of 85-265VAC. The power inductor can be compatible with 0510 color ring inductor or CD43 chip inductor. BP85221AL integrates a 1600V rectifier diode, a 550V high-voltage MOSFET, a high-voltage start-up and self-power supply circuit, a current sampling circuit, a voltage feedback circuit and a freewheeling diode. It does not need an external VCC capacitor, reducing the number of peripheral devices, lowering system cost and volume, and improving reliability.