LM5166: The output voltage tolerance issue

Zhang Liang

Part Number: LM5166
Other Parts Discussed in Thread: LM5155, LM5165

Hi,

Please kindly review below schedule diagram that we need the output voltage is 3.3V+/-0.05V, and there are some mass product that the output voltage is 3.36V, it maybe 2% failure rate,

and we use the LM5155 has no this issue(The LM5166 don't add R1104 and the ILIM is floating), thanks.

over 1 year ago

0 Frank De Stasi over 1 year ago

TI__Guru 59145 points

Hello

A think that the LM5155 is a boost, so I am not sure how it relates to this issue.

Also, the schematic shows LM5165.

However, it appears you are using the device in PFM mode.

I don't think that you can rely on that mode to give very tight output voltage tolerance.

You may need to try COT mode.

Also, for the fixed Vout device, the limits on a 3.3V output are 3.23V to 3.37V.

I am not sure you can get better using an external divider.

Thanks

0 Frank De Stasi over 1 year ago in reply to Frank De Stasi

TI__Guru 59145 points

Hello

I will close this post.

Thanks

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LM5166: The output voltage tolerance issue