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CC2642R: Running CC2642R on Lithium Ion Battery

Alexander Wenner
Intellectual 420 points
Part Number: CC2642R
Other Parts Discussed in Thread: TPS62840,

Hi.

Up to now we have been running our prototype custom boards directly from a small lithium ion battery rated for 4.2V. We are messuring peak currents of 4.382V (using aon_batmon interface) when the battery is fully charged. Our electrical engineer is thinking about adding a voltage regulator to 3.3V, since the 4.2V are above the absolute maximum voltage rating for the CC2642.

Since we have so far not seen any problems running cc2642s with those voltages we are wondering about the absolute maximum of 4.1V provided in the cc2642 specs and how much of a problem it is running a cc2642 above that voltage?

Lithium ion batteries are typically 4.2V/3.7V (max/standard voltage). What is your experience running cc2642 with those? 

Sincerely,

Alexander Wenner

  • 0
    TI__Mastermind 27145 points

    Hi,

    It may fail in the long run and it may also reduce the life of the chip.

    Better to use Regulator and keep the voltage in the operating range limits.

    Thanks,

    PM

  • 0 in reply to PM
    Expert 2160 points

    I would recommend using the TPS62840 when running off lithium ion cells. You can configure it for 1.9 V output (to have some margin to the CC2642R min operating voltage) and run the CC2642R in internal regulator mode to save the 6.8 uH inductor (the internal DCDC is not used below 2.1 V anyway). 

    /F