LM26484: about the voltage of LDOGATE

tsuyoshi tokumoto

Part Number: LM26484

Hi team,

My customer is designing a proto type with using LM26484 now.

I have a question about a case that he doesn't use the function of internal
LDO(ENLDO=Low).
I understand that the voltage of LDOGATE pin will be low regardless
of the LDOFB pin voltage.
Is my understanding correct?

Best regards,
Tsuyoshi Tokumoto

over 7 years ago

0 Jari Niemela13 over 7 years ago

TI__Genius 13850 points

Hi Tsuyoshi,

If ENLDO is low LDOGATE have to stay low also to avoid leakage from VIN to LDO output.

Best regards,
Jari Niemelä

0 tsuyoshi tokumoto over 7 years ago in reply to Jari Niemela13

Expert 2630 points

Hi Jari-san,

Thank you very much for your prompt reply.

Please let me ask you a additional question.
If the internal LDO is never used(ENLDO=Low),will the LDOGATE pin and
the LDOFB pin be able to be left floating?

Is there any problem?

Thank you and best regards,
Tsuyoshi Tokumoto

0 Brian Berner over 7 years ago in reply to tsuyoshi tokumoto

TI__Mastermind 30280 points

Tokumoto-san,

If the LDO controller is not used (LDOEN=0 and no FET connected in the circuit), then I do not see any issues floating LDOGATE and LDOFB pins.

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LM26484: about the voltage of LDOGATE