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LMR10510: Wrong value of R1 or R2 used for 3V3 output

__Koen__
Prodigy 10 points
Part Number: LMR10510

Hi,

According to the datasheet, for the LMR10510X 3V3 1A output, R1 needs to have a value of 45K3 and R2 needs to have a value of 100K (see figure 9.2.3.2, page 18). However, according to chapter 9.2.1.6 (page 15), the resistor values for the feedback are calculated by the following equation:

R1 = ((Vout/Vref) - 1) * R2

Where R2 >= 10k and Vref = 0.6V

If we're using R2 = 100K, we get the following solution for R1:

((3.3/0.6)-1)*100K = 450K

If we're using R1 = 10k, we get the following solution for R1:

((3.3/0.6)-1)*10K = 45K

So, the figure needs to be updated with either R1 = 450K or R2 = 10K.

  • 0
    TI__Guru**** 191445 points

    Koen,

    You are correct.  The R2 values should be 10.0 k.  Looks like the decimal point disappeared.  Normally we would not revise a datasheet for a minor typo.  We will include that change the next time a major revision is planned.