TPS2117: Input and Output Capacitors

Hi Dice,

Yes we would recommend ceramic cap to suppress fast transients.

Regards 

Kunal Goel

Hi Kunal,
Thank you for your reply.

I have encountered a problem which I suspect is due to VIN1 and VIN2 failing in short mode.
Looking at the circuit diagram, I noticed that there are no ceramic capacitors near the input and output.
Could you please let me know if there are any other problems?

I have sent you the circuit diagram in a private message.

Best regards,
Dice-K

Hi Dice,

Let me check and get back.

Regards

Kunal Goel

Hi Kunal,
Thank you for your support.

How much time does the check take?

Best regards,
Dice-K

Hi Dice,

Sorry I didn't see the message.  I will get back asap.

Regards 

Kunal Goel

Hi Dice,

Design looks fine. How much is VIN1 and VIN2 typical voltage?

Yes we should use ceramic cap on VIN and VOUT pins. 

Regards

Kunal Goel

Hi Kunal,
Thank you for your replay.

VIN1 is USB, and VIN2 is three dry batteries.

VIN1: 4.5V(Min), 5V(Typ), 5.5V(Max)
VIN2: 3V(Min), 4.5V(Typ), 5.4V(Max)

Are there any improvements that can be made other than adding ceramic capacitors to VIN and VOUT?

Best regards,
Dice-K

Hi Dice,

Looks fine otherwise.

What kind of issue you are facing?

Regards

Kunal Goel

Hi Kunal,
Thank you for your support.

I am concerned about whether the cause of the VIN1 and VIN2 short destruction is a missing input/output ceramic capacitor, or whether there are other causes of the large current that need to be considered.

Best regards,
Dice-K

You see vin to gnd short ?

Hi Kunal,
Thank you for your reply.

I have not confirmed any shorts between VIN and GND.
I have not been able to get back the defective device in the first place.
Based on the nature of the defect, I suspect that it is destruction caused by a short between VIN1 and VIN2.
For this reason, I am first investigating the problem with the circuit diagram.

Best regards,
Dice-K