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LM43603: About Bootstrap capacitor selection

Kaji@PAN
Mastermind 7015 points
Part Number: LM43603

Hi,

I am considering using the LM43603 device.
I would like to ask you about Bootstrap capacitors.
The data sheet states that a capacitor with a withstand voltage of 6.3V or higher and a capacity of 0.47uF should be used.
In EVM, 25V withstand voltage product is used for CBOOT.
Considering the DC bias characteristics, I think a capacitor with a higher withstand voltage is better.
However, the only 0.47uF capacitor that can be used in my company is GRM033R60J474KE90 (0.47uF, 6.3V).
Is there any problem in operation with GRM033R60J474KE90?
If the above capacitors cannot be used, we are considering using GRM033R61E104KE14 (0.1uF, 25V).
Is there any problem in operation even if I use 0.1uF for CBOOT?

Best regards,

  • 0
    TI__Mastermind 27030 points

    HI

    Prefer to use 0.47uF 6.3V, but 10V 0.1uF also fine to use.. when LM43603 start to work, the boot capacitor's voltage is charge by VCC when synchronous fet is turned on. VCC voltage is 3.3V and 5.5V  is boot to SW maxim voltage rating. so it is safe to use 0.47uF 6.3V ceramic cap.

    Thanks