TPS56C215: VREG5 Capacitor

tateo yamashiro

Part Number: TPS56C215

Hi,

We got a question from the customer about TPS56C215.
Could you help us?

[Question]
They are considering using 2 pieces 4.7uF are connected in parallel for VREG5 capacitor, because of improved reliability. Are there any concerns for this usage? They are concerened about the inrush current capability of internal LDO.

Best Regards,
tateo

over 7 years ago

0 Gavin Wang (Zejing) over 7 years ago

TI__Expert 3480 points

I have forward this question to application in this part. Thanks.

0 Vental Mao over 7 years ago

TI__Expert 5745 points

If you want to use the internal LDO(VREG5), the 4.7uF is enough. It's a little big about the 2*4.7uF, because the LDO need more current to charge the big cap which may cause the LDO unstable during start-up(The internal LDO output current limit is nearly 150mA-Typ). So 4.7uF is enough.

For the inrush capability , the LDO can cover the boot cap charging.

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TPS56C215: VREG5 Capacitor