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Looking for a Power load switches

Lakshminarayana
Genius 3790 points
Other Parts Discussed in Thread: TPS22919, TPS22810

Hi,

In my application, I need to switch ON and OFF Power(3.3V at 1A max-3.3W) to another IC through GPIO of the controller(3.3v), I initially had chosen TPS22919 which has 1.5A continuous current. But when I calculated the Max Power dissipation as per the datasheet is given in 11.3 Thermal Considerations which has a max P dissipation of 0.5W. 

Looking for a Power load switch for this application.

Even the TPS22810 says max Current of 3A and max P Dissipation is about 1.6W at Ta-23C.

(Is my calculation wrong?)

Thanks.

  • 0
    TI__Mastermind 32650 points

    Hi Lakshiminarayana,

    I think you are miscalculating the amount of power dissipation that the device needs to handle. 3.3V will not be dropped across this device.

    The power dissipated through this device is I^2*R_on when it is on. Use this power in your thermal circuit analogy and you will see that TPS22919 can indeed pass 1A safely.

    Thanks,