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TIDA-01093: what's the function of the diode-D67&D43?

zehua hu
Intellectual 935 points
Part Number: TIDA-01093

Hi,

Please help to analyse the function of this two diode. Thanks a lot !

  • 0
    TI__Guru 54715 points
    Hi Zehua,
    The diodes will prevent the outputs from forcing current back through the internal paths to the regulator input REGSRC.
  • 0
    TI__Genius 12215 points

    Zehua

         This 2 diodes serves the purpose to clamp the voltage at DSG and CHG pin voltage under the scenario when the DSG or CHG signal of top device transits from low to high, as Q32 or Q30 Drain would see a big transient and such transient is likely to be coupled to the DSG or CHG of bottom device, if the transient spike on DSG and CHG of bottom device are high enough, there would be a high potential risk for Q32 or Q30 to be damaged