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LM25118: Vin current comsumption when Vout is no load

Wayne Wang20
Expert 4380 points
Part Number: LM25118
Other Parts Discussed in Thread: LM5118

Hi team,

My customer is using LM25118 in a demo board. Input is 8V~14V and output is 12V. 

When we test the demo in the condition that Vin=14V, Vout=12V without any load, VCCX=0V, EN=H, we found that the current on Vin is about 14mA. In our datasheet, it listed a Vin current of 4.5mA. But the datasheet test condition is no load on LO and  HO which is different with customer's test condition. So could you please help evaluate if the 14mA input current value is normal based on customer's test condition. Thanks.

Best regards,

Wayne

  • 0
    TI__Mastermind 21720 points

    Wayne,

    Thanks for reaching out with your question and for considering the LM5118 in your design.

    The operating current of the LM5118 is when current sunk by the VIN pin. The specification is assuming there is no switching of the MOSFETs during this time. This condition can be tested by setting the UVLO pin voltage below 1.23V and besting the EN pin to 5V. Note that the specification is only for the VIN pin current. This doesn't include any external voltage dividers of the leakage current of other components.

    Please feel free to contact me directly if you have any questions.

    Thanks,

    Garrett