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LMR36503-Q1: Minimum input for 5V output

Daniel Wang (auto)
Intellectual 2840 points
Part Number: LMR36503-Q1

Tool/software:

Hello team,

There is conflict about minimum input for 5V output, in figure 9-11, minimum value is about 5.3V, but in figure 9-21, it shows near 6.3V, it looks both figures are under same mode, Iout, frequency, can you clarify the reason for the difference?

Besides, for the two figures above, they are data under temperature 25C, can you share the data for -40C to 125C? Thanks.

Regards,

Daniel Wang

  • 0
    TI__Mastermind 28400 points

    Hi Daniel,

    In figure 9-21, at input voltage reaches down to 6V, the device is still constantly switching at 2.2MHz as shown. For a given switching frequency, the duty cycle is limited by minimum off-time. As the input reduces, the device will continually increase the duty cycle until it hits minimum off-time, and in order to maintain the regulation target, the device instead will keep switching, but at a reduced frequency. When the switching frequency can no longer drop, the device is in dropout, which is at 5.3V, so the two graphs are aligned.

    Let me look to see if we have data for this. 

    Thanks,

    Richard