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TPS7A85: Bias Supply

Ohad Bonneh
Intellectual 910 points
Part Number: TPS7A85

Tool/software:

Hi Team, 

If we have output voltage of 1.8V, do we need to connect the bias supply to ground or VCC? 

Thanks! 

  • 0
    TI__Expert 4170 points

    Hi Ohad,

    For Vout= 1.8V, the minimum recommended Vin is VIN = VOUT(nom) + 0.5 V = 2.3V.

    As mentioned in Note 1 of Section 6.3 of datasheet, "no BIAS supply is required when the VIN supply is higher than or equal to 1.4 V. A BIAS supply helps improve dc and ac performance for VIN ≤ 2.2 V."

    If BIAS is not used, the BIAS pin could be left floating or tied to ground.

    Regards,

    Bobby