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TPS7A53: About the value of the feedback resistor

Kaji@PAN
Mastermind 7830 points
Part Number: TPS7A53


Hello,

I'm looking at feedback resistor values for the TPS7A53 device.
I have confirmed that Table 5 in the datasheet lists the recommended values for the feedback resistors.
(Question)
Please let me know if you have any information on how much the resistors deviate from the recommended values.
My design specs are below, but I may change the feedback resistors from the recommended values.

VIN:1.5V
VOUT:1.2V
IOUT:3A

Best regards,

  • +1
    TI__Guru 50025 points

    Hi Kaji,

    These resistor values in Table 5 are nominal values, not including resistor tolerances, and at room temperature. The LDO output will vary slightly over temperature, as well as the resistor's resistance will vary slightly over temperature. If you can find resistors that have temperature coefficients available, you can figure out your operating temperature and adjust them, but understanding the LDO output voltage temperature variation will be harder to account for. Finding the operating temperature for the resistors can be difficult as well because the board temperature where the resistors are mounted is not easily calculated. 

    The recommended values of R1 = 12.4k, R2 = 24.9k will work well if you use resistors with 0.1% tolerance. 

    Regards,

    Nick