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Solar charging of Lithium cell without exceeding MSP430 VCC limit

lslonim
Expert 1710 points
Other Parts Discussed in Thread: BQ24210

Hi,

I have an application where I need to use a solar cell to charge a Lithium battery that powers an MSP430. I looked at the bq24210, but it allows the battery voltage to go up to 4v, which would destroy the MSP430 that is being operated. Is there a way to do this cleanly, or do I need to have a switcher downstream of the battery to make sure I stay below 3.6v while the battery is being charged.

Lloyd

  • 0
    Prodigy 180 points

    I think you definitely need to use a DC-DC converter to lower the Li-ion voltage to 3.3V or lower. The voltage of a Li-ion battery is well beyond MSP430's maximum ratings. You can use TI's Power Architect to select an appropriate chip and circuit to do the job.