TPS2421-1: Design Calculator tool

Hi Fujiwara,

Please see my response below.

1. Is The revision of the design calculator tool on TI.com latest one?
   1. Yes
2. Does it need Cload nearby VOUT-pin?  
   1. Cload is the total capacitance present on the output rail of the efuse.
3. Do I need to consider the inrush current for Iload-max of design calculator tool?
   1. The inrush current is regulated by the efuse as mentioned in section 8.4.1 of the datasheet. It is recommended to load the output only after the efuse output has ramped up completely.You can connect the PG/ pin of TPS2421 to the Enable the downstream load. This will reduce the stress on the internal FET and helps in successful startup. 
4. Regarding R-tol, CLOAD-tol and CCT-tol in design calculator tool, how to set the value? For example, if RRSET is choose by 30Kohm/5%, R-tol is set 0.05, right?
   1. Yes. A tolerance of 5% has to be entered as 0.05 

TPS2421 is an old part. If you can provide me the following information, I can suggest you a latest part which is cost competitive, Smaller in size and feature rich.

• Vin(max) =
• Iload(max) =
• Cout (max) =
• Protection Features required = 

As a starting point you can have a look at TPS2595

Hi Praveen,

I will send customer condition via e-mail later.

Best Regards,
Fujiwara