• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 63 subscribers
  • Views 303 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TPS7a3001 Power Pad connection

Alex52381
Intellectual 810 points

Hello,

I am currently using the tps7a3001 and tps7a4901 voltage regulator LDO's. According to the datasheets, I can either leave the powerpad open, or tie it to ground. I am prototyping the circuit using a standard breakout board, and because of this I will not have easy access to a ground plane.

Is it okay to leave the pad floating? I will be running voltages in the +5V and regulating it down to +3.3V and -3.3V (post inverter). Previous posts by TI employees have indicated that this can cause "flaky performance".

Thanks,

Alex

  • 0
    TI__Expert 8890 points

    Hi Alex,

    These LDOs will not need to have the powerpad grounded but of course good grounding is still necessary.  The feedback resistors should be a near to the feedback pin as possible and the feedback ground point needs to be as near to the ground-pin as possible.  The primary return current path through the load and the input and output capacitors should be routed away from the ground-pin reference.

    The power dissipated in your application will most likely not be a problem.  If the thermal limit is reached and the part starts cycling on and off then perhaps you might need take further measures (like using a fan) but I doubt that this will be necessary. 

    Regards

    Bill