描述：2A STEP DOWN SWITCHING REGULATOR from ST Microelectronics: http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00001392.pdf http://www.st.com/st-web-ui/static/active/en/resource/technical/document/application_note/CD00004056.pdf http://www.st.com/web/en/catalog/sense_power/FM142/CL1456/SC355/PF63212?s_searchtype=keyword This is a schematic symbol only. It has no associated SPICE model.