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Original question:

LM5176: LM5176, how much bias current of internal regulator can handle?

LM5176: VCC Current Limit Clarification

Jared Becker
Genius 11495 points
Part Number: LM5176

Hi Team,

In the datasheet, Ivcc is spec'd at 65mA minimum. What is the worst case value for the current limit though? What is the maximum for that spec?

Thank you,

Jared

  • 0
    TI__Guru 68495 points

    Hi Jared,

    VCC regulator is an LDO and the only spec that matters is the guaranteed available VCC current, which is the min limit of Ivcc.  It is because VCC regulator supplies the driver and its current capability can impact the driver performance.  The design should be done such that it draws less than the Ivcc min limit.  Therefore, the max limit does not mean much in a design, and we did not intentionally look for the max limit in the characterization.

    Hope this explains. 

    Best Regards,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Genius 11495 points

    Hi Youhao,

    Thanks for the insight. The concern is not so much the driver performance, but there are scenarios where the VCC voltage is supplied from BIAS and it would be good to know the maximum potential current that can be drawn from the BIAS pin. Is that something you can provide?

    Thanks,

    Jared

  • 0 in reply to Jared Becker
    TI__Guru 68495 points

    Hi Jared, 

    We usually do not separately specify BIAS current capability but it should at least supply Ivcc min.  Please allow me sometime to find the info if existing.

    Thanks,

    Youhao

  • 0 in reply to Youhao Xi
    TI__Genius 11495 points

    Sounds good Youhao! If you do find any data on it, please let me know. Thanks!

  • +1 in reply to Jared Becker
    TI__Guru 68495 points

    Hi Jared,

    Here is the answer:  the current limit for BIAS is the same for the VCC regulator.  Hence, your design should also observe 65mA as the guaranteed current. 

    Thanks,

    Youhao