LMR14050-Q1: Minimum SS time

Lee, Sam

Expert 6105 points

Part Number: LMR14050-Q1

Hi team,

In datasheet of LMR14050-Q1, it seems that there is no spec of minimum soft start time.

-. Is it okay although SS pin is floating?

-. When not using Css, what is the min. SS time?

Thanks,

Sam Lee

over 6 years ago

0 Neal Zhang over 6 years ago

TI__Expert 4720 points

Hi,
Sorry we are in Chinese new year holiday. Please send an email to andy.chen@ti.com and he will reply to you in Feb.11

0 Andy Chen over 6 years ago

TI__Mastermind 34875 points

Hi,

SS time is almost zero if SS pin is floated, but the output capacitor require charging up time. SS time must be larger than output cap charging up time otherwise it may cause startup issue. the minimum SS pin currrent is about 2.1uA.

0 Lee, Sam over 6 years ago in reply to Andy Chen

TI__Expert 6105 points

Hi Adny,

Thank you for your answer.

Best Regards,
Sam Lee

Power management

Power management forum

LMR14050-Q1: Minimum SS time