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How we can charge a 5V device monitoring the input voltage in real time

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testtest:
We have made a PCB using a MIC2876 to boost a 2.5V/4.5V 0.5 A input voltage to 5V output to be able to feed any device connected to two USB ports (USB-C and USB-A.)

We've also implemented a current sensor connected to an LED strip to monitor the incoming energy level.

We tested the unit by applying an input voltage in the range of 2.5V to 4.5V 0.5A but instead of boosting to 5V the output voltage is the same as the input - it fails its purpose.

We have tried to replace the IC and also built other PCBs but with the same result. We also tried to remove the current sensor to make sure it was not producing an excessive resistance, drawing all the incoming current but that didn't help, either.

Do you have any idea of what could cause the malfunction and do you have any suggestion to improve, if possible, the design?

todorp:
I don't know it this is the problem but in the MIC2876 datasheet example (page 2) OUTS pin is connected directly to OUT pin...

gamalot:
When you say "applying an input voltage in the range of 2.5V to 4.5V 0.5A", you mean that the power supply you are using has current limitation or overcurrent protection, right? Have you tried to increase the current limit?

gamalot:

--- Quote from: todorp on December 13, 2021, 10:48:02 am ---I don't know it this is the problem but in the MIC2876 datasheet example (page 2) OUTS pin is connected directly to OUT pin...

--- End quote ---

What you see is a reference design of a fixed output voltage models.

testtest:
We try to increase the current range between 0.5A to 2A but the result is the same, the IC output is the same as the input

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