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TPS82150: Efficiency below 1mA load current

JMA
Prodigy 80 points
Part Number: TPS82150
Other Parts Discussed in Thread: LMZ21701, TPS62150, TPS62175

Hi,

With a 12-17V input range and a 5V output with a load current less than 1mA (100uA - 1mA), what is the approximate conversion efficiency or input current?

The datasheet does not show any data below 1mA load.

Thank you

Jan

  • 0
    Prodigy 80 points

    Ok, the LMZ21701 datasheet shows data down to 100uA load, is the low power performance of the TPS82150 perhaps comparable to the LMZ21701?

    The LMZ21701 shows about 40% efficiency at 17V input with a 100uA load at a 5V output voltage.

    Jan

  • 0 in reply to JMA
    TI__Guru*** 142860 points
    Hi Jan,

    It seems that when you replied to your own thread, we missed this as an un-replied to thread.

    Yes, the low power efficiency should be similar between those 2 devices. You can also see the discrete version, TPS62150, D/S for curves down to 100uA.

    Note that efficiency at this low load current is strongly dependent on the choice of FB resistor values, as explained here: www.ti.com/.../slyt469.pdf

    Finally, the TPS62175 is a simple, non-module IC with a SLEEP mode that increases the efficiency in this range.
  • 0 in reply to Chris Glaser
    Prodigy 80 points

    Thank you Chris, this clears it up for me, didn't know about the discrete version. I am pushed for space so will stick to the module and take note of the FB resistors.

    Jan