LM2950-5.0 LM2950-5.0 电源IC LM2950-5.0/3.3V LM2950-5.0_O LM2950-5.0TA LM2950-5.0V LM2950-5.0V/LM2950-3.3V LM2950-5V LM2950A LM2950ACZ-3.0