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Original question:

TPS22810-Q1: Voltage back drive issue in power load switch

TPS22810-Q1: Connect Vin directly to car battery

Wei Xiao
Intellectual 505 points
Part Number: TPS22810-Q1
Other Parts Discussed in Thread: TPS22810, TPS1H000-Q1, TPS4H160-Q1, TPS22919-Q1

Tool/software:

Can the Vin of TPS22810 be directly connected to car battery? We had issues before where devices rated 18v were damaged when directly connected to LIN bus. 

  • 0
    Intellectual 505 points

    Is TPS1H000-Q1 better option in this kind of application, ie, Vin from battery and Vout drive a load?

  • 0 in reply to Wei Xiao
    Intellectual 505 points

    Looked a bit more. If for 5v and lower load switch, can use TPS22919-Q1? And if for 12v car battery multiple channel high side switch, can use TPS4H160-Q1? The load is ACC, REV, ILL detection/trigger wires for head units, which usually draw less than 0.2A current. I wonder if there is a lower cost one with lower current rating?

  • 0 in reply to Wei Xiao
    TI__Mastermind 28070 points

    Hi Wei Xiao,

    Connecting car battery to the load switch may result in damage due to transients/surges which are generated in automotive environment. As long as these surges are below the abs max of device (20V in this case), the device shouldn't get damage. 

    Wei Xiao said:
    Is TPS1H000-Q1 better option in this kind of application, ie, Vin from battery and Vout drive a load?

    Yes, High side switch are better option here than the load switch.

    Wei Xiao said:
    If for 5v and lower load switch, can use TPS22919-Q1?

    Yes, this should be fine. Please do check for any abs max violation.

    Regarding the high side switch recommendation, kindly create a new thread with high side switch part number. Thank you. 

    Best Regards,
    Arush