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TPS7B4254-Q1: ADJ Voltage

Shuhei Goto
Intellectual 2090 points
Part Number: TPS7B4254-Q1

Hi team,

2 question about ADJ:

  • How does it work when the ADJ is less than 2V? (Disable?)
  • Is it a problem to apply voltage to ADJ when VIN is 0V? 

Kind regards,

Goto

  • +1
    TI__Expert 4350 points

    Hi Goto-san,

    Question 1:

    From the Electrical Characteristics Table:

    ADJ pin below 0.7 V will disable the output.

    ADJ pin above 2 V will enable the output.

    ADJ pin between 0.7 V and 2 V is not guaranteed to be either enabled or disabled. The output will turn on between 0.7 V and 2 V, but we do not guarantee turn-on for all conditions until ADJ pin reaches 2 V.

    Question 2:

    No, that is not a problem.

    From the Absolute Maximum Ratings table:

    ADJ - IN voltage should be limited to 18 V.

    Vadj - Vin = 18 V (limit).

    If Vin = 0 V, then ADJ voltage up to 18 V is acceptable.

    Best,

    Eric