LMR14203: Need the maximum operating voltage applied across the bootstrap capacitor for LMR14203 and LM2842Y

Komal Charan Garlapati

Part Number: LMR14203

Hi,

I'm performing capacitor derating analysis for some of our boards. I need to know the max operating voltage applied at the Bootstrap capacitor for LMR14203 and LM2842Y. Could you please let me know?

Thank you,

Komal Charan Garlapati

over 2 years ago

+1 Daniel Li14 over 2 years ago

TI__Mastermind 27030 points

for LMR14203, 7V is max voltage between boot and SW, as SW will be Vin and -0.7V, so boot max voltage is Vin+7V,

for LM2842Y is same voltage rating with LRM14203

0 Komal Charan Garlapati over 2 years ago in reply to Daniel Li14

Prodigy 80 points

Thank you Daniel.

0 Daniel Li14 over 2 years ago in reply to Komal Charan Garlapati

TI__Mastermind 27030 points

I will close this question, thanks

0 Komal Charan Garlapati over 2 years ago in reply to Daniel Li14

Prodigy 80 points

Hi Daniel,

Just wanted to confirm with you, the voltage across the capacitor (between SW and CB) is independent of Input or the Output voltage. It is for providing the sufficient drive voltage for the Gate Pin above the Source Pin. Am I right?

Also, the datasheet mentions that 7V is the absolute max voltage. So, the max working voltage shall be lesser than 7. Right?

0 Daniel Li14 over 2 years ago in reply to Komal Charan Garlapati

TI__Mastermind 27030 points

yes, it is independ of Output voltage and input votage unless Vin<5V, as the boot voltage won't higher than Vin.

The max working voltage is less than 7V,

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LMR14203: Need the maximum operating voltage applied across the bootstrap capacitor for LMR14203 and LM2842Y