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TPS22960: Slew rate pin disconnected?

Ken Diep
Prodigy 80 points
Part Number: TPS22960
Other Parts Discussed in Thread: TPS22976

Is it okay in any application to leave the slew rate pin disconnected? It is currently being used as a switch for 5V and 3V3 power buses on a battery powered device. I am thinking that a higher slew rate would be better to reduce inrush current and hence improve the battery life but at the moment the design has it left disconnected.

Many thanks

  • 0
    TI__Genius 10855 points

    Hey Ken, 

    Thanks for reaching out on E2E!

    The SR pin on the TPS22960 shouldn't be left in the floating state. I recommend connecting it to GND for the faster slew rate option, or pulling it high for a slower slew rate.

    In general, you might want to consider a different dual channel load switch like the TPS22976. This device has a lower Ron, adjustable slew rate control, and better thermal performance. For that device, you could keep the slew rate pin floating for the fastest possible rise time.

    Thanks,

    Arthur Huang

  • 0 in reply to Alpha H
    Prodigy 80 points

    Thanks for the swift reply Arthur.

    How adjustable is the slew rate pin for these devices? As in, if you drive it at a voltage in between the high and low states, what would that do to the slew rate?

    The TI website recommends the TPS29915; it doesn't quite match the TPS22976 in terms of Ron and current rating, but covers around a tenth of the area. I think I will consider this instead, but thank you for the advice.