LMR14030-Q1: maximum bootstrap capacitance

Shinji Tsuji

Genius 13058 points

Part Number: LMR14030-Q1

Hi team,

Is there any concern if I use 0.22uF as Cboot of LMR14030-Q1 while 0.1uF is recommended?

Could you please advise the maximum value I could use for Cboot?

regards,

0 Shipeng Cheng 10 months ago

Hi,

The Cboot can be 220nF. Usually 100nF is enough.

0 Shinji Tsuji 10 months ago in reply to Shipeng Cheng

Hi Cheng-san,

Could you please advise the maximum value it can take?

regards,

0 Shipeng Cheng 10 months ago in reply to Shinji Tsuji

Hi,

I think we only need to ensure a minimum value of Cboot. What is your purpose to put a big capacitor here?

0 Shinji Tsuji 10 months ago in reply to Shipeng Cheng

Hi Cheng-san,

Due to lack of 0.1uF capacitor, I need to use 0.22uF.

Then I would like to make sure maximum tolerance of 0.22uF cap meet the requirement.

regards,

+1 Shipeng Cheng 10 months ago in reply to Shinji Tsuji

Hi,

Why you say 0.1uF is not enough? If it's true, the biggest Cboot I have seen before is 1uF.

0 Shinji Tsuji 10 months ago in reply to Shipeng Cheng

Hi Cheng-san,

Thank you. I don't mean 0.1uF is not enough, but due to the component shortage, I cannot use 0.1uF MLCC.

regards,

0 Shipeng Cheng 10 months ago in reply to Shinji Tsuji

Hi,

Got it. Then 0.22uF is a choice.

BR,

Shipeng

Power management forum