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TLV702: SCH review

Amelie Zheng
Genius 10865 points
Part Number: TLV702

Hi team,

Could you help for the TLV70233 SCH review?

Thanks!

  • 0
    TI__Mastermind 37005 points

    Hi Amelie,

    Please make sure that the enable pin voltage does not exceed the Vin voltage through proper sequencing of the 1.8V rail and 3.8V rail.  The ferrite bead B2 looks like an inductor with some DC resistance at low frequency.  Please be sure that the Q of the ferrite bead with the capacitors is damped.

    The Q of an LRC circuit can be calculated from the following equation:

    As a general rule of thumb, you want Q < 2.

    Everything else looks good to me.

    Thanks,

    - Stephen

  • 0 in reply to Stephen Ziel
    TI__Genius 10865 points

    Hi Stephen,

    Thanks for your reply.

    As for the proper sequencing of the 1.8V rail and 3.8V rail, I am a little confused.

    Usually firstly 3.8Vin and then enable the EN pin, is it right?

    Because EN PIN is connected to 1.8V, how will it exceed the Vin=3.8V?

  • 0 in reply to Amelie Zheng
    TI__Mastermind 37005 points

    Hi Amelie,

    It is not shown in the schematic how the 1.8V and 3.8V are generated. But from the datasheet, the EN pin voltage cannot exceed Vin.  So the 3.8V would need to come up first prior to the 1.8V.  As long as that sequence of events is happening, this portion of the design will be fine.

    Thanks,

    - Stephen