TPS65218D0: How much capacitance is okay to load on IN_nCC output?

Eric S

Part Number: TPS65218D0

Customer is having ESD related issue, which is improved with 100pF cap load on IN_nCC line (at the processor input). How much capacitance load can be put on the IN_nCC signal? What are the risks? They plan to test with 100pF, 220pF, 1nF, and 10nF... but looking for some guidance from Design on what kind of cap loading would be okay on this output. Thank you.

over 6 years ago

0 Mahmoud Harmouch over 6 years ago

TI__Mastermind 28200 points

Hello,

The IN_nCC is a push-pull output and the max sinking and sourcing current is 1mA. I think a small cap of 100pF to 220pF should be OK but I'm forwarding the thread to the appropriate person who has more experience in this partr.

Regards

0 Eric S over 6 years ago in reply to Mahmoud Harmouch

TI__Expert 5640 points

Do we have any data on the range, or at least a maximum resistance of the pull-up and pull-down transistors of this IN_CCn push-pull output circuit? Thanks in advance.

0 Brian Berner over 6 years ago in reply to Eric S

TI__Mastermind 30280 points

Eric,

The IN_nCC pin and the PGOOD_BU pin have the same push-pull circuitry internally. You should be able to derive the resistance of the internal push & pull transistors from the VOH and VOL specification of PGOOD_BU.

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TPS65218D0: How much capacitance is okay to load on IN_nCC output?