Cboost in LM2734Y

And this some (way/how) relates to TM4C?
Equally we wonder about multiple currency movements - may we ask that (as well) here?

When introducing items non-central to TM4C - perhaps some attempt to justify one's "wonder" should be considered...  (i.e. forum more aimed @ that device)

Moving it to DC-DC Forum

Hi Darush,

When the device starts up, the internal circuitry from the BOOST pin supplies a maximum of 20 mA to Cbst. This current charges CBst to a voltage sufficient to turn the switch on; and a larger Cap on the Boost Pin could make the charging time longer; which might effect performances such as dropout etc . However, the best option would be to check it on bench; are you using a LM2734 Y EVM?

Regards,
Doyel

Hi Doyel,

Thanks for your answer. No, I am not using the EVM. The reson for my question is that, in my circuit with an input between 12-6.4v and 5v out, when the input voltage goes below 6.8v the circuit starts giving a high frequency buzz sound. I have tried a cople of things and found out that with Cboost changed to higher value I can achieve better result. I used up to 1u and could observe a stable 5v and no buzzing. However I could only see 10n recommended value for this throuhgh out the entire datasheet...

/With my best regards

Hi Darush,

Please can you share with us your schematic ?

Thank you,
Doyel

Hi Doyel,

Here it is. As meantioned before the input can vary down to 6.4v. The max load is around 150mA.

/BR

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