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Original question:

LM34936: diode on VIN

LM34936: BIAS pin

Dice-K
Mastermind 7470 points
Part Number: LM34936

Hi support team,
Continuing from the "Original question" above.

What conditions require the BIAS pin to be energized?
Please let me know the conditions of VIN, etc.

Regards,
Dice-K

  • 0
    TI__Guru 58641 points

    Hi Dice,

    thank you for using the E2E forum.

    Note sure about your questions: BIAS is an input for the LM34936

    So what do you mean with " be energized"

    Best regards,

     Stefan

  • 0 in reply to Stefan Schauer
    Mastermind 7470 points

    Hi Stefan,
    Sorry for my poor question.

    I would like to confirm whether it is not necessary to apply a voltage of 8V or higher to BIAS when VIN is 4.2V or higher.

    moreover,
    I would like to confirm if my understanding is correct that connecting VOUT to BIAS will reduce power loss when "VIN > VOUT > 8.5V".

    Regards,
    Dice-K

  • +1 in reply to Dice-K
    TI__Guru 58641 points

    Hi Dice,

    The LM34936 will start to operate if VIN is higher then 4.2 V but note that VCC is generated out of VIN or BIAS so without BIAS VCC can only be close to VIN and that voltage level is also used to drive the MOSFETs. So when operating at that point you need to ensure that the used MOSFETs are OK with that Gate voltage. If OK you do not need to supply BIAS.

    You second question is correct : connecting VOUT to BIAS will reduce power loss when "VIN > VOUT > 8.5V"

    Best regards,

     Stefan