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TPS62260: Minimum Input Capacitance

Michael Balourdas
Expert 5135 points
Part Number: TPS62260

Hello,

Is there a minimum input capacitance required for this device? I have a 4.7uF cap, but curious what would happen if that cap were to open in a fault condition.

Thanks,

Michael

  • 0
    TI__Intellectual 1070 points

    Hi Michael,

    The input capacitor of a buck converter provides high-frequency filtering and decoupling of VIN from other circuits. It is therefore always strongly recommended to design in an input cap as close to the input pins as possible.

    Regarding the minimum input capacitance, the datasheet recommends 4.7uF to 10uF for most applications. Since MLCCs significantly derate with DC bias, I would tend towards 10uF. But this depends on your application and you should validate your solution with the specific passives you plan on using.

    For further reading, you can take a look at the following Application Note. https://www.ti.com/lit/an/slyt670/slyt670.pdf

    If you're worried about Cin opening in a fault condition and you're not working under severe size constraints, you can always put two input caps in parallel for extra redundancy.

    Best regards,
    Louis