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I am searching a LDO for my design but I have a problem. Some of the LDOs don't have PSRR value. So, I can not compare these LDOs then others for noise feature. For example here are 2 LDO.

Why these LDOs don't have PSRR value? What does it mean?

MCP1801T-3302I/OT

enter image description here

AP7354-33W5-7 (doesn't have PSRR Value)

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  • \$\begingroup\$ For example I want to compare for noise rejection MCP1801T-3302I/OT and AP7354-33W5-7. But the second one doesn't have PSRR value. \$\endgroup\$
    – mtoprak
    Mar 28, 2022 at 13:46
  • \$\begingroup\$ Oh, you already put the part numbers. Didn't see, sorry. Deleting my previous comment. \$\endgroup\$ Mar 28, 2022 at 13:47
  • \$\begingroup\$ hah no problem, I know this is about my low experience but I can't find answer on the google :) \$\endgroup\$
    – mtoprak
    Mar 28, 2022 at 13:50

1 Answer 1

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Both datasheets actually do have data on the power supply ripple rejection.

The datasheet for the AP7354-33W5-7 doesn't list a single number in the specifications table, but it has this:

enter image description here

Likewise, the MCP1801T-3302I/OT has this:

enter image description here

You can get a more detailed comparison using the charts than you would get from a single line in a table.

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  • \$\begingroup\$ Thank you for this answer. I think that AP7354 series look not good at PSRR so they dont give specifications table on it. \$\endgroup\$
    – mtoprak
    Mar 28, 2022 at 14:03

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