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LMR16006: what is difference between Standby (28uA current) & shutdown (1uA current) mode in case of LMR16006

rajan
Prodigy 100 points
Part Number: LMR16006
Other Parts Discussed in Thread: TPS62125

Hi,

Requirement is Vout =9.0V @300mA & Vin = +12.0V (regulated). Load is a DC supply for a RF amplifier. Also DC supply of RF amplifier will be switched (ON time = 100ms , OFF time  =500ms )

I selected LMR16006 buck regulator using webench designer tool.

In LMR16006's datasheet , standby mode with 28uA current as well as shutdown mode with 1.0uA current are mentioned.

My question : 1. What is the meaning of standby here in LMR16006?

2.Is there any way to put LMR16006 regulator in "standby" mode? If yes then how?

Basically I want to avoid a DC switch circuit (for DC switching purpose) between LMR16006's Vout & RF amplifier's bias point .

Regards

Rajan

  • 0
    TI__Expert 5745 points
    From the datasheet, the standby mode means Operating quiescent current (non-switching) when the Vin=12V, no load. Normally,we set the FB more than 0.765V. So I prefer to disable the SHDN as standby.
    Maybe someone else have some new ideas.
  • 0
    TI__Genius 11085 points
    Hi Rajan,

    The shutdown current is the current supplied by Vin when the part is in shutdown mode, SHDN-bar = 0V.
    The standby current is the current supplied by Vin when the part is enabled, operating, Vout in regulation, but no load.

    It's not very clear what you want in the 'standby' mode. If you want Vout maintain 9V regulation when load is switched off, then keep LMR16006 enabled SHDN-bar = logic high. If you want Vout turned off when load is turned off, then use SHDN-bar switch to 0V to shutdown the LMR.

    -Yang
  • 0 in reply to YangZhang
    TI__Expert 5745 points

    Hi Yang:
    I have a question, in the datasheet it shows that 28uA standby current and operating non-switching. But in your words ,the standby mode just means no load , it still have the output(still have switching in the IC). So which one is correct? Thank you!

  • 0
    TI__Guru**** 150830 points
    The TPS62125 is another device, which can meet your Vin, Vout, Iout needs. It has lower specs for both Iq and Isd.
  • 0 in reply to YangZhang
    Prodigy 100 points

    Thanks Yang for giving brief description of Shutdown and standby mode.

    "Earlier I was thinking that LMR16006's  "standby" mode is a mode under which LMR16006 is fully ON but will deliver Vout based on some enable/disable logic. This will help me in eliminating DC switch circuit after LMR16006 & DC on/off will be faster as compared to shutdown mode--> which is not correct."

    Regards,

    Rajan

  • 0 in reply to Vental Mao
    Prodigy 100 points
    Thanks Vental for reply
    Regards