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BQ25713B: bq25713b regn ldo no-output

haichao zhu
Prodigy 10 points
Part Number: BQ25713B

hi

bq25713b regn pin no-output in my design

input voltage of vbus is  11v , regn pin place 3uf cap

11v  convert  3.3v by external ldo ,  3.3v connect to vdda

voltage of ilim_hiz is 1.6v 

voltage of vsys is 0v

input voltage of regn ldo  from vbus, but  regn ldo no output

i need your help 

thank you 

  • 0
    TI__Expert 3320 points

    Hi There,

         Thanks for asking. Actually VDDA should not be powered externally, instead below is the correct VDDA pin configuration and TI EVM schematic is also added. Vsys=0 because controller still shuts down due to low VDDA voltage external clamp. 

       

    Regards