L7987 by ST Design and production,in HongKong RichShine Technology Co., Limited Spot sales,And can pass HongKong RichShine Technology Co., Limited Purchasing。L7987 Price reference $ 2.280000。L7987 - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information L7987 Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial