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Original question:

AMC3336: HLDO High-side supply current for auxiliary circuitry

AMC3336: External powre supply to DCDC_IN

Koshi Ninomiya
Expert 5455 points
Part Number: AMC3336
Other Parts Discussed in Thread: AMC3330

Tool/software:

Hi Team,

In case of typical application of the AMC3336/AMC3330, DCDC_IN is supplied from LDO_OUT of internal LDO between VDD and LDO_OUT.
However, if the customer consider power loss of the internal LDO, can they supply external 3.3V to DCDC_IN?
What is the operating voltage range of the DCDC_IN?

Best Regards,

Koshi Ninomiya

  • +1
    TI__Intellectual 2511 points

    Hello Koshi Ninomiya, 

    The internal DC/DC converter operates in close-loop control. We do not adjust the duty cycle or frequency of the DC/DC but rather the input voltage for the DC/DC.  This means the LDO_OUT is a pre-regulator (only) for the DC/DC converter and also critical for the regulation. We adjust the LDO_OUT voltage low, or high, such we reach the regulated target between DCDC_OUT vs DCDC_GND.

    I hope this helps. 

    Best regards, 
    Jiri Panacek, 

    Systems Applications Engineer, ISC