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TPS778: TPS77818D

Shreehari G P
Prodigy 210 points
Part Number: TPS778

Hi,

For our internal project we are using TPS77818D LDO. Kindly review the attached schematics and let me know the comments.

  • +1
    TI__Genius 12960 points

    Hello,

             I think the schematic looks fine. The schematic label indicates an input supply of 3.3V, but the title however suggests an Input supply voltage of 6V. An input supply voltage of 3.3V should not cause any issues, however, if a 6V input supply is being used, please take care to operate at an ambient temperature that ensures that the power dissipation does not take the Junction Temperature beyond 125ºC. Please also take care ensure that COUT (C20) has an ESR in the range 50mΩ ≤ RESR ≤ 1.5Ω. Thanks!

    Regards,

    Srikanth

  • +1 in reply to Srikanth Lolla Venkata
    TI__Genius 12960 points

    Hello Shreehari,

                              May I know the reason for having the inductor at the Input of the LDO and what its value is? The inductor could cause voltage spikes during load transients and start-up. Increasing the value of the associated capacitor (C17) to 10uF e.g. would help reduce the magnitude of the spikes. Thanks!

    Regards,

    Srikanth

  • 0 in reply to Srikanth Lolla Venkata
    Prodigy 210 points

    Hello  Srikanth,

    It is a Ferrite bead provided at input power. This is to filter the noise from the power.