TPS53513: VREG capacitor min required value

K. Sasaki14

Part Number: TPS53513

Coul you tell me min required effective capacitance value for VREG.

It is 1uF on datasheet Fig.43, however 2uF is put on EVM. Thus I think 1uF effective capacitance value is required for VREG.

Is my idea correct?

Best Regards,
Kohei Sasaki

over 8 years ago

0 Vental Mao over 8 years ago

TI__Expert 5745 points

Yes, 1uF is enough. If your work condition is very hot, you need to set the cap bigger because of the loss of the temp

0 JohnTucker over 8 years ago in reply to Vental Mao

TI__Guru**** 191445 points

The TPS53513 datasheet does not give any specific recommendation for the VREG capacitor. Only the application schematic shows 1 uF. The EVM uses 2 x 1 uF capacitors. They are rated for 16 V. At 5V applied voltage the effective capacitance is very near 1 uF. Let me check with the EVM designer if there is a specific reason that he doubled up on the capacitors.

0 JohnTucker over 8 years ago in reply to JohnTucker

TI__Guru**** 191445 points

From the EVM designer:
"One (C18) was placed on the top and the other (C26) was placed on the bottom layer. I believe at the time when the EVM was designed, only one was supposed to be populated and the other was supposed to be a “no pop”. It was a mistake and never got taken out."

So a single 1 uF capacitor is acceptable.

0 K. Sasaki14 over 8 years ago in reply to JohnTucker

Guru 10200 points

John-san,

Thank you for your support.
Is effective capacitance more than 0.5uF enough?

Best Regards,
Kohei Sasaki

0 JohnTucker over 8 years ago in reply to K. Sasaki14

TI__Guru**** 191445 points

I would suggest near 1 uF. With 16 V rated capacitor, that I checked the effective capacitance was very close to 1 uF.

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TPS53513: VREG capacitor min required value