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INT- TPS2501 Iq for battery system

Rocson He
Intellectual 1830 points
Other Parts Discussed in Thread: TPS2501, TPS2500

Hi,

My customer is now using TPS2501 for one portable speaker with power bank project.

For one cell battery, 3V-4.2V boost to 5V, at no load, the IC supply current could be 8-10mA.

I tested it on our EVM, it's the same.  This number is not the same with the 400uA of datasheet. I learned that 400uA is measured by adding 5.2V at Vaux, but it's not practical for one cell battery application. There is no 5V in the system, and that's why we need TP2501 for boost.

could you help on this? How is the number looks like for TPS2500? I just have TPS2501EVM at hand now.

Thanks.

  • 0
    TI__Expert 7990 points

    The 400uA is measured with 5.2V on Vaux to turn boost converter switching off, and is a stated part of the test conditions.  Note that power from both Vin and Vaux are specified here, perhaps not applicable in your application, but an indicator of the bias currents drawn by the various sections.

    The TPS2500 has "eco mode" for light load efficiency and should offer lower no-load input current.  Note that the effect of the higher output ripple voltage on audio performance must be assessed.

    Your ultimate best solution is to pull EN low when the boost function is not needed - assuming that "no load" is a "power off" or "no audio input" condition. 

  • 0 in reply to Martin Patoka
    TI__Intellectual 1830 points

    Martin,

    Thanks for the answer.

    Is the operation current of TPS2500 the same with TPS2501 at heavy load, what is the number?

    With Eco mode, what is the exact number of Iq for light-no load?

    Yes, agree that sable the part when idle is best choice, but not practical for this project now as customer don't want to add insert and pull-out detection.

    I have ordered the TPS2500 EVM, but it will need two more weeks to get it and do the test.

    Thanks for the help.