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TPS61022: Tips to reduce rail droop during load transient?

Cameron Wutzke
Expert 3612 points
Part Number: TPS61022

Tool/software:

Hey folks, hope all is well! This is an extremely broad question- I’m using this boost part number since we plan to use in design. But really any buck / boost would be relevant. 

we are a handheld powered by 1s lithium ion battery. Batteries naturally droop voltage when load is applied. Due to internal resistance of the battery. 

We notice VBATT -> VSYS droop when we pull a lot of current. Do you have any general tips to reduce the droop of our VSYS? 

Unfortunately, we don’t have the physical space for a large capacitor. Capacitor bank was my initial thought. Plus making sure decoupling CIN is very close to boost’s input pin. 
thanks!
cameron 
  • 0
    TI__Genius 12505 points

    Hi Cameron,

    Thanks for reaching out.

    I am a little confused about the question, could you please clarify which one is the problem you have?

    1.You have a Boost converter in your application now but find the output voltage of Boost drop too much when load transient?

    2.Or you don't have one but want to add a Boost converter between VBAT and VSYS, due to the voltage drop when load transient?

    If it is the condition 2, please share the operation conditions, including input voltage range, the output voltage you want and the load current range, so that I can suggest a suitable Boost solution to you.

    Regards,

    Nathan

  • 0 in reply to Nathan Ding
    TI__Expert 3612 points

    Hey Nathan,

    thanks for reaching out. Im going to email for a bit more context. It’s moreso a question if you have any best tips + best practices to reduce VIN current ripple, or VIN voltage ripple

  • +1 in reply to Cameron Wutzke
    TI__Genius 12505 points

    Hi Cameron,

    We have received your mail, so I will close this thread.

    We can discuss by mail if you have any question.

    Regards,

    Nathan