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Input Current vs. Output Current LM25575

Pascal Enz
Prodigy 20 points
Other Parts Discussed in Thread: LM25575, LM3100, TPS54140A

I'm using a LM25575 to deliver 3.3 Volts with a average load of 1A.

It's all ok, but if the load shrinks to aprox. 100 uA the input current is still 8mA.

Is there any possiblility to reduce the input current? The webbench simulation shows an input current of 44uA with this load.

Any suggestions?

  • 0
    TI__Genius 16025 points

    Hi Pascal,

    Is your enable input voltage divider drawing too much current? If its not, then there must be some other source of leakage at your input pins. If all else fails I would recommend using Simple Switchers line of LM310x such as LM3100 which have smaller quiescent currents in light load/no load conditions. Feel free to send us your schematic and application circuits. We can troubleshoot the issue quicker that way.

    I hope this helps. Feel free to ask further questions.

    Thanks,

    Anston

  • 0 in reply to Anston Lobo
    Prodigy 20 points

    Hi Anston,

    thank you for the quick reply.

    I realized that this is the nominal bias current listed in the datasheet.

    I order now the TPS54140A to get the needed result.

    Pascal