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TPS798-Q1: Minimum ESR Requirement

Peiheng Liu
Prodigy 620 points
Part Number: TPS798-Q1

Hi,

I am looking into the specification of TPS798-Q1 and the output capacitor is recommended to be >1uF and <3Ohm in ESR. Is TPS798-Q1 stable as long as the effective Cout > 1uF, with no ESR zero? Thanks for your help!

Peiheng.

  • 0
    TI__Guru 55940 points
    Hi Peiheng,

    While every capacitor will have some ESR, ceramic capacitors have very low ESR. TPS798-Q1 is stable with ceramic output capacitors. In order to have a stable output, use any capacitor greater than 1 uF that has less than 3 Ohms of ESR. We do always recommend prototyping and performing load transient tests as described in the following Application Report to ensure that the capacitor selection meets the application specific performance expectations:

    www.ti.com/.../slva381b.pdf

    Very Respectfully,
    Ryan
  • 0 in reply to Ryan Eslinger
    TI__Prodigy 620 points

    Hi Ryan,

    Thanks for your prompt reply! Yes, there would be Iout transient test during customer prototyping and I confident that TPS798-Q1 would be stable with various MLCC. It would be better if a minimum ESR boundary is available for detail assessment in electric vehicle BMS application. 

    Thanks for your help!

    Peiheng.