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TPS74401: Can Vbias go up to 5.5V?

Ella KIM
Expert 4212 points
Part Number: TPS74401

Hi Team,

I want to clarify Vbias range. Datasheet describes two different values. May I know how two tables indicates two different maximum value? 

Table in 6.5 indicates Vbias = 5.0V in the front line. Can you help elaborate more what the 2.375~5.25V range means when Vbias = 5.0V is given?

Customer's ultimate question is whether they can apply Vbias upto 5.5V. 

Thanks,

Ella

  • 0
    TI__Genius 12665 points

    Hi Ella, 

    I apologize for the delayed response. I was OoO. 

    Thank you for sharing this information. The Vbias=5.0 V is the value at which each parameter is tested unless otherwise noted. As an example, Current Limit is tested with a Vbias=5.0V, so similarly Vbias range of 2.375 to 5.25 V could be tested using Ven=1.1V, Vin= Vout+0.3V Cin=Cbias=0.1uF, Cout=10uF, Iout=50mA and Tj = -40 to 125. 

    This means that under those specific given conditions, 2.375 to 5.25 V is the range that Vbias was measured/tested to, but Vbias can still operate within the recommended operating condition shown in table 6.3. 

    I will discuss this with the team to make sure that the understanding is correct and have a double check. 

    Best, 

    Edgar Acosta

  • 0 in reply to Edgar Acosta1
    TI__Expert 4212 points

    Hi Edgar,

    Is there an update?

    So far my understanding from your comment; Vbias pin can goes upto 5.5V without damage but we cannot guarantee the electrical specification listed in datasheet. So it's recommended to limit Vbias supply to 5.25V for customer use case.

    Let me know if this is a correct guidance for customer.

    Thank you,

    Ella

  • +1 in reply to Ella KIM
    TI__Genius 12665 points

    Hi Ella, 

    After reviewing this with the team, there shouldnt be any concern by going up to 5.5V. This is a very robust device and should be safe to operate at Vbias=5.5V. 

    Here is a similar thread explaining why 5.25V was used: (2) TPS74401: TPS74401 Vbias Datasheet conflict - Power management forum - Power management - TI E2E support forums.

    I apologize for the confusion. I will see what we can do from our end to avoid future confusions. 

    Best, 

    Edgar Acosta