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LMR14206: Transform Buck to Inverting Buck-Boost

Pavel Yermolenko
Intellectual 280 points
Part Number: LMR14206


Hello,

The SNVA856A AppNote deals with using buck DC-DC convertors in instead of inverting buck-boost (IBB), where negative voltage is needed.

Is this technique valid for all buck converters circuits ?

This technique suppose that generated negative voltage becomes ground for the converter chip.

But the "quality" of such ground is less than "quality" of the original ground ... and this could impact the performance of the internal staff of buck chip, isn't it ?

Any comments ?

Thanks.

  • 0
    TI__Guru* 78630 points

    Hi Pavel,

    Thank you for considering our solution.  Yes the concept in that app notes is generic and can be applied to most buck circuit.  Regarding the ground, the IC specs are referencing to its GND pin.  Note that grounding is a relative concept, and it can be floating if you reference to a different potential in the system.  As long as the IC pin signals referring to its GND pin meet the specs, the performance will be maintained. 

    Thanks,

    Youhao