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TPS62745: Inquire TPS62745 Quiescent Current too high

user4773172
Intellectual 1410 points
Part Number: TPS62745

Hi Sir,

Please refer SCH as below, Vin=7.5V, Vo=3.3V, the Iin=5.5mA during no load, it's higher than datasheet quiescent current spec.

May I learn from you how we can improve quiescent current ?

Thank you.

Edward Chen

  • 0
    TI__Genius 14876 points

    Hello user,

    The quiescent current is not a specification which could be improved by reworking the passive elements around the IC. Iq is defined as being the current drawn by the IC in a no-load and non-switching but enabled condition.

    Here is an app-note which explains really well the matter: http://www.ti.com/lit/an/slyt412/slyt412.pdf

    This ultra-low power area is a focus for Texas Instruments. We have new products fairly regularly. There is one device in particular which I think would be a great fit for your application, and it should be on the web and sampling here in a few weeks.

    If you can wait that long, great. If not, maybe you do a first board with the TPS62745 to start working on your system and switch to this new one on the next PCB spin.

    Thank you.

    Best Regards,

    Dorian

  • 0 in reply to Dorian Brillet de Cande
    TI__Genius 14876 points

    Hello user,

    I haven't heard back from you. 

    Do you have any further questions on the TPS62745? If you do, please reply below.

    Thank you very much!

    Best Regards,

    Dorian