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TPS62824A: value for inductor and output capacitor

Alex Lee
Prodigy 140 points
Part Number: TPS62824A
Other Parts Discussed in Thread: TPS62290, TPS62824,

Hello

We're considering to use TPS62824ADMQ (1A with forced PWM) to replace TPS62290 which is seriously out of stock. But the space of our PCB is very tight, can we keep 10uF * 1 for the output as well? 

Besides, is it okay to use 1uH (1uH+10uF) in this situation as the output current is <700mA. 

Thank you very much.

  • 0
    TI__Expert 7585 points

    Hi User,

    Thank you for your question.

    In order to select the best LC combinations, we advise you to look at the options available in the LC matrix of the datasheet.

    In particular for TPS62824A, I don´t see any problems with 10uF, whereas the advised inductor is 470nH instead of 1uH.

    In theory you can also use a 1uH inductor, but you need to verify if the device performances (in particular closed loop stability, load transients,  ..) are compatible with your applications, since they could be no more compliant with the datasheet specs.

    Please ask again if you need further support.

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • 0 in reply to Stefano Panaro
    Prodigy 140 points

    Thanks for your rapid reply. Just found TPS62841DLCR which may be a good choice as well. Except the output current, what's main different between them? why TPS62841DLCR is significantly more expensive?

    Thanks!

  • 0 in reply to Alex Lee
    TI__Expert 7585 points

    Hi Travis,

    Thanks again for your question.

    TPS62841 is an high efficiency device, particularly optimized for light load efficiency. The quiescent current (60nA) is among the lowest one in our portfolio, and this allows to keep an high efficiency even at 1uA load, heavily reducing the power consumption.

    On the other end  TPS62824 is again an high efficiency device, but it's not fully optimized for very light load condition (its quiescent current is around 4uA). Moreover,  if you choose the forced PWM version (TPS62824A), the forced switching will guarantee a smaller output ripple, at the cost of an significant decrement of the light load efficiency, 

    Please ask again if you need further support.

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).

  • 0 in reply to Stefano Panaro
    Prodigy 140 points

    Thank you Stefano, very clear explanation!

  • 0 in reply to Alex Lee
    TI__Expert 7585 points

    Hi Travis,

    You are welcome.

    I will close the thread now.

    Feel free to reply below if you need further support.

    Thanks,

    Stefano

    All information in this correspondence and in any related correspondence is provided “as is” and “with all faults”, and is subject to TI’s Important Notice (http://www.ti.com/corp/docs/legal/important-notice.shtml).