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TPS61376: How to calculate the total quiescent current

Shunsuke Yamamoto
Expert 6156 points
Part Number: TPS61376

Hi team, 

I found that there are two cases of quiesecent current. How do we calculate the total quiescent current from them? Should I just sum them(IQ_VOUT, IQ_VIN)?

Best regards,

Shunsuke Yamamoto

  • +1
    TI__Expert 7370 points

    Hi Shunsuke,

    Thank you for reaching out.

    1. When Vin=2.9V to 5.25V, internal VCC is powered by Vout. At this time, IQ into Vout is 80uA and IQ into Vin is 1.5uA. When Vin=5.5V to 23V, internal VCC is powered by Vin. At this time, IQ into Vin is 80uA and IQ into Vout is 2uA. This is why there are two ranges.

    2. Even though internal VCC is power by one of Vin and Vout, there is still some leakage current caused by internal circuit. So the other pin still exist small IQ. This is why both Vin and Vout exist IQ.

    3. Would you please explain what does the total quiescent current refer to? Do you mean input current with no load?

    Regards,

    Mulin