AWR1843: The default RF LDO configuration if rlRfSetLdoBypassConfig is not called

Adam Yao94020

Part Number: AWR1843

Hi champion,
Customer's 1843 board use 1V input for RF rail, but they forget to call rlRfSetLdoBypassConfig to disable the internal LDO. Does it have any impact to power rail? Is there any default setting for internal RF LDO?

Thanks,
Adam

over 3 years ago

0 CHETHAN KUMAR Y.B. over 3 years ago

TI__Mastermind 25835 points

Adam,

If the power to the Input to the RF rail is still 1V, And If the LDO bypass config is not called, then there is not much "drop out" is available on the LDO as output of the LDO is also going to be close to 1V, Hence LDO will not be able to regulate the output voltage and LDO output will follow input, There would not be any harmful impact. However for the proper operation it's strongly recommended to use the rlRfSetLdoBypassConfig.

Thanks and regards,

CHETHAN KUMAR Y.B.

0 Adam Yao94020 over 3 years ago in reply to CHETHAN KUMAR Y.B.

TI__Genius 10910 points

Hi Chethan,
Got it, thanks for your reply.

Best regards,
Adam

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AWR1843: The default RF LDO configuration if rlRfSetLdoBypassConfig is not called