Hi,
I made a PCB for NCP167BMX330TBG(3.3 Voltage regulator) and unable to understand why it isn't working.
I attached the schematic and PCB.
This is the datasheet:
https://datasheet.lcsc.com/lcsc/2107280040_onsemi-NCP167BMX330TBG_C892227.pdf
Iv'e connected it now through a matrix to a 3V lithium battery as Vin and connected EN pin to Vin.
What could be the issue?


Thanks

 

I'm confused. Why are you connecting a 3.3V regulator to a 3V battery? Regulators are meant to reduce voltage. Attach it to 6V to regulate it down to 3.3V.

 

I'm confused. Why are you connecting a 3.3V regulator to a 3V battery? Regulators are meant to reduce voltage. Attach it to 6V to regulate it down to 3.3V.

Hi, it's a DC-DC boost regulator, raises the voltage up to 3.3V

 

As @peterdeco points out, regulators are not boost converters. In fact, they reduce the input voltage by some amount depending on the particular part. So, if you are expecting 3V in to get you 3.3V out, you will be disappinted.

Also, you say “it isn’t working” but you don’t say what that means. While you do have a fundamental problem: insufficient supply voltage, if that wasn’t the case, how would we know where to start helping you?

If you are asking for help with a problem, “I have a problem” is not enough information. You have to go on to say, “…and here are the unexpected or undesirable behaviors I am seeing…”.

 

As @peterdeco points out, regulators are not boost converters. In fact, they reduce the input voltage by some amount depending on the particular part. So, if you are expecting 3V in to get you 3.3V out, you will be disappinted.

Also, you say “it isn’t working” but you don’t say what that means. While you do have a fundamental problem: insufficient supply voltage, if that wasn’t the case, how would we know where to start helping you?

If you are asking for help with a problem, “I have a problem” is not enough information. You have to go on to say, “…and here are the unexpected or undesirable behaviors I am seeing…”.

Ok, it is a boost converter and I get 0V at the output.
The operating input voltage range according to the datasheet is: 1.9 V to 5.5 V

 

Ok, it is a boost converter and I get 0V at the output.
The operating input voltage range according to the datasheet is: 1.9 V to 5.5 V

But it’s not a boost converter, it’s a low drop out voltage regulator so you will need at least 3.51V at the input to get your 3.3V part to function. The datasheet is very clear on this.

 

Hi, it's a DC-DC boost regulator, raises the voltage up to 3.3V

It's not a boost converter. (If it were, where's the inductor?) Look at this line in the datasheet:

In case you are not familiar with the term "dropout", it means that the INPUT must be at least 450mV GREATER than the OUTPUT for it to work at 1.8V output, or 290mV GREATER than the OUTPUT for it to work at 3.3V output.

 

It’s actually a very nice part with excellent specs. It just can’t magically raise the input voltage.

 

Ok, got it. Thanks!