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TPS61291: The power consumption

Jerry Hsu3
Prodigy 150 points
Part Number: TPS61291

Hi Sir,

I am in charge of a IoT project. I plan to use TPS61291 for main power supply.

Just wondering the current consumption, would you please let me know the maximum output current of the following condition :

VIN : 3.0V ~ 3.6V

Vout : 3.8V

  • 0
    TI__Genius 9046 points

    Hi Jerry,

    Are you sure the device is TPS61291? The device VOUT options are only 3.3V, 3V and 2.5V. There is no 3.8V available. 

    -Wenhao

  • 0 in reply to Wenhao Wu
    TI__Genius 9046 points

    Hi Jerry,

    Could you please let me know your comments? Thanks!

    -Wenhao

  • 0 in reply to Wenhao Wu
    TI__Genius 9046 points

    Hi Jerry,

    Since there is no reply from you. I put a general answer that I would use to check max output current:

    1.Check the minimum current limit threshold of the device. For TPS61291, it is 700mA;

    2.Assume the efficiency of the application case. Check the efficiency curve in datasheet. Typically I would use min Vin for the worst case. So let VIN=1.8V, Vo=3.3V, TPS61291 has average efficiency of 85% for load>1mA;

    3.Calculation delta IL: Use 300mA for TPS61291

    4.Calculation maximum output current

    Imax=(VIN*EFF/VOUT)*(ILIM-150mA)

    For VIN=1.8V, VOUT=3.3V, EFF=85%, ILIM=700mA, we have IMAX=255mA.

    Another way to check maximum output current is go to datasheet Figure 16. There is a curve over there.

    -Wenhao