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LM5146-Q1: the difference between standby mode and shut down mode & when to use each mode?

Noriyuki Takahashi
Genius 9245 points
Part Number: LM5146-Q1
Other Parts Discussed in Thread: LM5146

Hi team 

Could you tell the the difference between standby mode and shut down mode?

And could you also tell when to use each mode?

Customer wants to use the device in shut down mode in their system because low Iq is required but not sure the difference.

Regards,

Noriyuki Takahashi

  • 0
    TI__Expert 4031 points

    Hi Noriyuki,

      1.In Shutdown mode,  EN voltage is lower than the internal bias supply LDO and the switching regulator are off. They can pull EN pin<0.42V if they want to use shutdown mode.

      2.In Standby mode, the internal LDO is on and regulating. Switching action and output voltage regulation are disabled. (VSDN<EN voltage<VEN)

    BR,

    Victor

  • 0 in reply to Victor Yu
    TI__Genius 9245 points

    Victor,

    So, when should standby mode be used? 

    Standby mode brings higher Iq than shutdown mode. Not sure the advantage of standby mode compared to shutdown mode.

    Regards,

    Noriyuki Takahashi 

  • 0 in reply to Noriyuki Takahashi
    TI__Expert 4031 points

    Hi Noriyuki,

      In standby mode , internal LDO is enabled , the internal  logic is working. But no switching ,no regulated output.

      Because the internal bias supply LDO has a lower enable threshold than the switching regulator. We call this mode "standby mode" between shutdown and active mode. That is, this mode will exist during we enabling the LM5146. But normally we won't configure  the chip as standby mode.

     Your customer can shutdown the LM5146 by pull EN pin down when they didn't  need output.

    BR,

    Victor