TPS2557DRBR by Texas Instruments(TI) Design and production,in Hong Kong QX Electronics Limited Spot sales,And can pass Hong Kong QX Electronics Limited Purchasing。TPS2557DRBR Price reference $ 2.190000。TPS2557DRBR - 。You can download Chinese information、Pin map、DatasheetData sheet function specification,In the information TPS2557DRBR Detailed pin diagram and function application circuit diagram voltage and usage method and tutorial