• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 63 subscribers
  • Views 223 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.

Component selection

Gaston_Melo_Arg
Mastermind 7675 points
Other Parts Discussed in Thread: TPS62750

Hi to all,

               I have an application where the battery has to charge supercaps if the voltage of the supercaps drops bellow Vmin (1.5V). I need a buck converter that can enter in shotdown mode or can disconnect himself when the supercaps are fully charged. The Vin is in the range of 3.7V to 4.2V. Is there a component who can do that?

Regards

Gastón

PD: Move this post if this is the wrong forum.

  • 0
    TI__Guru**** 150820 points

    First, I would recommend that you re-title your post with a more descriptive title as to what you are trying to do.

    But it seems that you just need a buck converter that can take a 3.7-4.2V input and step it down to 1.5V?  What kind of charging current do you need for this?  Almost any TPS62xxx device will go into a low power standby state when the voltage gets up to 1.5V and then keep the cap charged.  The TPS62750 has been optimized for large output caps.

  • 0 in reply to Chris Glaser
    Mastermind 7675 points

    Hi Chris, the input to the buck converter will be 3.7V to 4.2V. The voltage of the supercaps is 3V. What I want is to charge the supercaps to 3V, is in this point where the buck converter must enter in low power mode and disconnect himself from the charge. When the voltage of the supercaps drops to 2 or 1.5V, the buck converter must  re-initiate the charge.

    Hope this clarify my post.

    Regards

    Gastón

  • 0 in reply to Gaston_Melo_Arg
    TI__Guru**** 150820 points

    Ah, this does help clarify things.  Best for you would be to use an SVS to monitor the cap voltage and drive the EN pin of the buck converter TPS62750.  The SVS forum can recommend a good SVS to use.