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TPS2120: Implementing power switch

Javier Moran
Intellectual 340 points
Part Number: TPS2120
Other Parts Discussed in Thread: LM66100

Dear Sirs, good night

Looking to add a power switch for an application.

It will receive power from a wall adapter (5V) or from 3x AA Cells.

The TPS2120 seems a good candidate but I would like to be sure if it is protected against reverse battery polarity.

Is there another alternative to this chip?

Thanks!

  • 0
    TI__Mastermind 34935 points

    Hello Javier,

    You can actually have the device protect against reverse polarity conditions by simply adding a diode on the ground network as such:

    See the 10.6 Reverse Polarity Protection with TPS212x section in the datasheet. Other than that if you need even more protection a good way to do this would be to place an ideal diode such as an LM74700 on the input rails for input protection.

  • 0 in reply to Timothy Logan
    Intellectual 340 points

    Hello Timothy, 

    Thanks for your reply. 

    The only thing that worries me is the is the voltage drop that the diode will introduce for the battery.

    Best regards,

  • 0 in reply to Javier Moran
    Intellectual 340 points

    Hello Timothy, 

    Finally I decided to go ahead with two LM66100. They have RPP. 

    What do you think?

    Best regards,

  • 0 in reply to Javier Moran
    TI__Mastermind 34935 points

    Hello Javier,

    What are the current ranges you are expecting to go through the TPS2120? The LM66100 is rated for a maximum of 1.5A so if you need something bigger you'll need to go with something like the LM74700 

  • 0 in reply to Timothy Logan
    Intellectual 340 points

    Hello Timothy.

    I am expecting currents <1 A.

    The quiescent current for LM66100  is lower for this device.

    Is there any drawback in using a combination of these chips for this solution? 

    Best regards,

  • 0 in reply to Javier Moran
    TI__Mastermind 34935 points

    Javier,

    Nope! This sounds like a good application for the LM66100 given that your currents are less than 1A. Feel free to post your schematic once you have a prototype and we will be happy to review it to make sure everything is connected properly.