• State Resolved
  • Locked Locked
  • Replies 1 reply
  • Subscribers 62 subscribers
  • Views 414 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

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.

LP2985AIM5-3.3/NOPB minimum input voltage

Kinga Virag
Prodigy 50 points
Other Parts Discussed in Thread: LP2985-N, LP2985

Hello,

I am new in this industry. The data sheet (http://www.ti.com/lit/ds/symlink/lp2985-n.pdf) says, that the input voltage is: 2.5 V to +16 V. This means that I can use for this a battery with 3 V?
If the input voltage is 2.5 V than the output is still approximately 3.3 V?

Thanks for your help!

  • 0
    TI__Mastermind 22610 points

    " ... If the input voltage is 2.5 V than the output is still approximately 3.3 V? ..."

    No. For proper operation the input voltage must be higher than the output voltage

    From the LP2985-N datasheet ELECTRICAL CHARACTERISTICS table:

           Unless otherwise specified: VIN = VOUT(NOM) + 1V

    At the very minimum : VIN ≥ VOUT + VDropOut

    For LP2985 to support an output voltage of 3.3V the input voltage should be at least 4.3V, and no more than 16V.

    If you know the load current you could estimate the Drop Out voltage from the max linits in the ELECTRICAL CHARACTERISTICS table. This would give you the minimum input voltage for marginal operation.