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TPS63802: application circuit with 5V input

Ue
Genius 17215 points
Part Number: TPS63802


Hi all

My customer is working on a supercap design and is evaluating the TPS63802.

He would like to use the circuit presented in this app note:

https://www.ti.com/lit/an/slvaei4a/slvaei4a.pdf Smart Electricity Meter Supercapacitor Backup Power Supply With Current Limit

but with a 5V input supply and a 3.3V output, please also refer to the attached block diagram.

Can you comment if this will work as expected ?

Any recommendations ?

... and do you have hardware for the circuit presented in this app note, meaning a PCB we can provide to the customer ?

As the project timeline is tight this would be much appreciated.

Best regards

Ueli

  • +1
    TI__Mastermind 32350 points

    Hi  Ueli,

    seems the block diagram attached is much different with application not, could you help to double check?

    actually, i think the diagram in application not is really complicated, but it will be ok for your application, may be we can find a much eaiser one.

    Regards

    Tao

  • +1 in reply to Tao Zhang
    TI__Genius 17215 points

    Hi Tao

    Thank you for the quick reply, I was already able to clarify this with our PSDS support, summary below.

    Best regards

    Ueli

    -----------------------------

    A simpler solution would be to use a linear regulator to charge the supercapacitor from the 24V at the input or to use an eFuse for the supercap charging as outlined in:

    slva920.pdf Charging Super Capacitor With eFuse

    TPS25940 2.7-V to 18-V, 42mΩ, 0.6-5.2A eFuse with reverse current blocking and DevSleep support

    (Vin limited to 18V max).

     

    A reference design to illustrate this solution is:

    PMP30528 Supercapacitor backup power supply for E-Meters reference design

    Using a 1S supercap and a boost DC-DC to provide the 3.3V:

    TPS61022 8-A boost converter with 0.5-V ultra-low input voltage

    -----------------

     

    The circuit as outlined in slvaei4a.pdf using the

    TPS63802 2-A, high-efficient, 11-µA quiescent current buck-boost converter in QFN/DFN package

     

    has the advantage of being able to charge the supercap to 5V from a lower supply voltage like 3.3V.

    However in this case an input voltage of 5V or 24V is available, so no need for boost charging.

  • 0 in reply to Ue
    TI__Mastermind 32350 points

    Hi   Ueli,

    that sounds good. have a good day.Grin

    regards

    Tao