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TPS55340: Current Issue

Part Number: TPS55340

Tool/software:

Dears,

Using TPS55340TER to boost 3.7V to 6V, the maximum output current can only be around 1.4A,pls kindly help to check it.

Schematic pls kindly find attachfile.

Thanks

  • Hello Ning,

    Please use the QuickStart Calculator which you can download from here:
    https://www.ti.com/tool/download/SLVC430

    The calculator proposes a lower inductance of about 3.3µH.
    If you are using a 10µH inductor instead, the inductor ripple ratio will become pretty low. but it may still work.
    The saturation current of the inductor is good enough for 1.4A load current.

    The calculator also shows:
    Use more ceramic output capacitance maybe 40uF or more.
    Multiple smaller capacitors are preferred over a few big ones.
    Also. please reduce R64 to around 1k

    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

    Best regards
    Harry