TPS629210-Q1: Schematic review - 12V down to 5.5V into a 5V LDO

Matthew Pole

Intellectual 300 points

Part Number: TPS629210-Q1

Hi,

Does this schematic look ok for a 12V down to 5.5V buck regulator into a 5V LDO for stable low current operation.

Thanks!

over 1 year ago

0 Athos Zhao over 1 year ago

TI__Expert 7320 points

Hi Matthew,

The schematic looks good, only one comment.

For such high 5.5V output voltage, the output capacitor C118 may have large derating and finally cause capacitance not enough.

Please add one more 22uF capacitor or at least reserve a placeholder.

0 Matthew Pole over 1 year ago in reply to Athos Zhao

Intellectual 300 points

Hi Athos,

That is great, thanks!

I have added an extra output capacitor. Does my layout look ok? I have minimized the loop as much as possible.

Thanks again for the help!

0 Athos Zhao over 1 year ago in reply to Matthew Pole

TI__Expert 7320 points

Hi Matthew,

The layout looks good.

I can't see the connection between GND copper to FB GND via, please ensure the trace is away from high-frequency noise to avoid loop issue since FB is sensitive signal.

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TPS629210-Q1: Schematic review - 12V down to 5.5V into a 5V LDO