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Is there any need to use an external regulator (like the TPS62740) with the CC2650 to reduce power consumption

PATRICK OHARA
Genius 3205 points
Other Parts Discussed in Thread: CC2650, TPS62740, CC2590, TPS62743

My application calls for simple integration of a CC2650 with additional memory (for data logging) and some modest analog sensor electronics. Would the addition of the external DC-DC regulator, like the TPS62740, reduce my power budget? Or is the internal DC-DC buck built into the CC2650 already going to do about as good as possible for reduced power? What if I wanted to use a power amplifier like the CC2590? Could that benefit from the TPS62740?

  • 0
    TI__Guru** 106705 points
    Hi Patrick,

    You will not save any current by using an external DCDC, the built-in regulator will be the most efficient solution.

    For CC2590 it is a yes/no answer. You will save current by reducing the supply voltage, but at the same time you will also lose output power. So it is basically the same as turning down the RF power to reduce the current consumption.

    Cheers,
    Fredrik
  • 0 in reply to Fredrik K
    Genius 3205 points
    Thanks Fredrik, this helps a lot. Now I don't need to build the more complicated design to find out I didn't save anything. Implementation without the external Buck Regulator and power amplifier will be much easier.
  • 0
    Genius 3205 points
    Turns out the guys want maximum power and sensitivity for our application. So, I'm back to a CC2650 with CC2590 power amplifier and TPS62743 regulator. I see that in external regulator mode, the CC2650 requires 1.8V operation. Unfortunately the CC2590 requires > 2.0V to operate and 3.0 or 3.3V would be best for improved output power. So, I've selected the TPS62743 to power the CC2590 and memory, while I use the internal regulator to run the CC2650. Does this seem like a reasonable solution? Also, is there any conflict running the three control lines of the CC2590 (EN, PA-EN, HGM) from the CC2650 even though it's not controlling the CC2590 for its own input?
  • 0 in reply to PATRICK OHARA
    TI__Guru** 106705 points

    Hi Patrick,

    Running both the CC2650 and the CC2590 from 3.3 V makes sense in this case. Then you should also use the internal DCDC regulator on the CC2650 for lowest possible current consumption.

    I am not sure what you mean by "even though it's not controlling the CC2590 for its own input", but there are no conflicts for the control signals. Since VDDS of the CC2650 is connected to 3.3 V, the IOs will be at this logic level.

    Cheers,
    Fredrik