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TPS7A91: Output overshoot

Will Wang47
Expert 5450 points
Part Number: TPS7A91

Hi team,

Customer is using TPS7A91 in their system generate 1.8V, they use 0.1uF SS cap, and find the output voltage get a small overshoot to 1.8V, then drop ~40mV down to 1.76V, later slow back to 1.8V; below is their test waveform and schematic, could you help check if this is normal and why there is happen?

Best Regards,

Will

  • 0
    TI__Genius 12040 points

    Hi Will,

               This device has very high Vout accuracy and it should not vary by more than 20mV, so it is not normal for the LDO output to drop by 40mV. Could you provide the behavior of the current flowing through the LDO during the time that the output drops by 40mV? Thanks!

    Regards,

    Srikanth