• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 62 subscribers
  • Views 106 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.

LMG3411R150: Component selection issue in internal buck-boost converter and its maximum operating frequency .

yathavakannan viswa
Prodigy 60 points
Part Number: LMG3411R150

Dear Team,

         Since all the parameters in the datasheet are specified at 500kHz, is it possible to use this IC for 1MHz application?. If operation at 1MHz is feasible, I would appreciate guidance on selecting suitable external components (such as inductor and capacitor) for the buck-boost converter.

        Additionally, as my design doesn't necessitate FET fault status, therefore I'm considering pulling down the fault pin with a 10K resistor. Would this approach be correct?

  • 0
    TI__Expert 5815 points

    Hi Yathavakannan,

    Yes, it is possible to use the IC at 1MHz application. Switching losses may be high in hard switching topology at 1MHz though, soft switching is not an issue though. For external components, we recommend a 10uH inductor with saturation current above 350mA. Wurth 74404020100 is an example of an inductor that will work here. A 2.2 µF, 25 V 0805 bypass capacitor is required between VNEG and ground. Due to the voltage coefficient of X7R capacitors, a 2.2 µF capacitor will provide the required minimum 1.0 µF capacitance when operating. 

    If not using the /FAULT pin output, please leave this pin floating.

    Best,

    Kyle