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Part Number: LM2735-Q1
Other Parts Discussed in Thread: TPS61378-Q1, LM2735

Tool/software: WEBENCH® Design Tools

I want to know what would be the inrush current at the startup based on Webench report?

Attached below is the Webench report

7571.12V 120mA 85C LM2735YQ.pdf

  • Hi Sahol,

    Are you still in device selecting stage? What's the target inrush current that you could select? Maybe you can look at TPS61378-Q1 which has soft start feature to limit the input inrush current.

    LM2735 is a non-synchronous boost converter without soft-start feature so its inrush current may be high and is related to the selected inductor, output capacitance.

  •  have done the layout of the board already. I have selected the IC for the following reasons

    Least BOM count

    Low profile components

    Highest efficiency

    Can you look at the parts I have selected and tell me estimated inrush current?

    Im thinking it should be in between 1A-2A. Also I cant afford to go beyond that.

  • Also can you tell me the minimum input voltage for the IC to work properly?

    I have designed for input voltage range of 3.3V - 3.7V

    Can the IC work if the input voltage goes below 3.3V?

  • Hi Sahol,

    The minimum input voltage is 2.7V.

    There is no equations to calculate the inrush current.

    You can use Pspice for TI to simulate the inrush current.