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LM22672: LM22672 power consumption too high

Part Number: LM22672

Hi teams:

VIN=24V; Load: no load;

1. First ground the EN pin of the chip (remove r215), and then test the power consumption of the whole machine at 5.4ma. Then I cut off the VIN pin of the chip, and then test the power consumption of the whole machine at 2mA again.

2. I think the sleep power consumption of the specification is 24ua, as shown in the figure below is our design scheme. Please evaluate whether there is a problem with our design scheme and can not trigger the low-power mode.

Power consumption of EN pin grounding test machine:

Power consumption of the whole machine tested after removing the VIN pin of the chip:

  • HI 

    can you check EN voltage and output voltage make sure that no switching and EN lower than 0.6V . cause internal pull up current is 6uA, when use 100Kohm resistor , the internal circuit may start to work when EN is around 0.6V. you can also try to use 1K resistor instead of 100K

    Thanks