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L4989D by STM Design and production,in Shenzhen ZHIRUIHONG Electronic Technology Co., Ltd. Spot sales,And can pass Shenzhen ZHIRUIHONG Electronic Technology Co., Ltd. Purchasing。L4989D Price reference ¥ 0。L4989D - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information L4989D Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial