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LT3050 Iout/Imon


My customers are considering using the LT 3050.
I got an inquiry there.

The value of Iout / Imon was measured under the following conditions, and it was measured to be around 87 in actual measurement.

Calculation using the calculation formula of data sheet P.15 resulted in about 95.5,
Calculation and measurement are different.

# 1  Is there graph data etc of Iout / Imon at low output current (@ Iout = 5 mA)?

# 2  Is there anything that can be considered as a reason why the numerical values differ between actual

   measurement and calculation?


VIN: 10 V
VOUT: 5.3 V
IOUT: 5 mA

Best Regards,


  • Yuya,

    LT3050 is a 100mA part; the accuracy of the ratio changes under light load.Several curves of Iout/Imon current ratio are given on page 11 and 12 in the datasheet.  The one that has similar operating condition as your application is:

    The ratio should be about 96.5. Is the circuit stable? Can you please check the waveform of the output current and the voltage on VIMON pin again?

  • Hi, MollyZhu

    Thank you for your answer.

    "the accuracy of the ratio changes under light load."

    >>Is it pointing to a place slightly rising at the light load (around <10 mA) in the data sheet P. 11 or 12 graph?
      Does that mean that it changes slightly from IMON: IOUT = 100: 1?

    Check output current, voltage waveform of VIMON.
    Although the ratio is 96.5, can you calculate by the following equation?

    Best regards,