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TIDA-00484: measuring 4-5mA "off"/leaking current instead of 300nA: TPL5111, TPS61291, TPS22860

Marius Bach
Prodigy 10 points
Part Number: TIDA-00484
Other Parts Discussed in Thread: TPL5111, TPS61291, TPS22860, CC1310

Tool/software:

Hi all,

Basically I use exactly the design as in TIDA-484 with TPL5111, TPS61291 and TPS22860 and I currently, for testing, programmed the TPL5111 for a 40 second interval.

The circuit is driving a RF-transceiver for LoRa, which sends a done-signal once a transmission of a measured value (temperature) is done. The startup, measurement and transmission take 2-3 seconds maximum. I set the done-pin high, wait 10ms and then send the mcu to sleep. Before it goes to sleep, power should anyway be cut by the TPL5111 timer. I tried with code not going to sleep and just send done and wait in a while(1) loop indefinetely, and nothing changes in the current consumption profile.

The problem is, that I still measure 5mA (at 3V input) and 4mA (at 2.8V input) instead of landing in a nano-amp range, where I should end up (270nA per TIDA). I wonder where it amounts to 5mA, which is much more than a bare RF-module would use as sleep current (6µA). And yes, I measure 5mA, not µA. For measurement I use a Brymen 869 Multimeter and also the nRF power profiler kit II. They are all measuring the same.

Any ideas?

  • 0
    Prodigy 10 points

    I had to rewrite the original post; I'm now constantly measuring even higher quiescent currents... I'm nowhere near the nA range at all, unfortunately.

  • 0
    Prodigy 10 points

    Perhaps a hint? I measure 0.8A startup current, probably charging the capacitors. I don't think I need current-limiting resistors before each capacitor? I don't think that would be best practice. Anyway my RF-module starts up as desired, works as expected and sends a done-signal as programmed...

  • 0
    Prodigy 10 points

    Moved to power management in the hope of someone knowledgeable for this topic.

  • 0
    TI__Intellectual 1730 points

    Hi Marius, 

    Sorry for the late reply. We have not experienced such a problem when driving CC1310. Yes power management is the best section in order to get this topic addressed as it seems very specific to the power ICs of such circuit. 

    Thanks

    Gio

  • 0 in reply to Giovanni Campanella
    Prodigy 10 points

    Dear Giovanni, thank you for your reply. Meanwhile I figured that removing the 3 TI devices TPL5111, TPS61291 and TPS22860 from my PCB and powering the µC directly would not impact my battery lifetime too much if I move from 2xAAA to 1xAA lithium 3.6V battery. I'm calculating around 3-5 years lifetime, which is more than enough.

    I liked the idea of powering down the entire circuit with the TPL5111 and using smaller batteries, but in the end I need a repeatable design without any issues or uncertainties.