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Lithium ion battery (single cell) overdischarge shut off

Icy
Intellectual 265 points

Hi,

I am using a single cell lithium ion coin cell battery (LIR2450) in my application and I want the battery to be completely disconnected from the circuit when it's low so it doesn't overdischarge. In my current setup, I am using a voltage detector tied to the enable input of a voltage regulator so the voltage regulator will be in shutdown mode when the battery is low. However, there is still a small current being consumed by the voltage detector circuit. Is there an IC or a way to have the battery totally shut off from supplying current?

  • 0
    TI__Guru 54715 points
    Hi Icy,
    I would expect the best way to avoid current is to have some physical switch to provide isolation. Most battery protection circuits will stay with the battery and will have some low shutdown or leakage current while waiting for a wake up or recovery signal.
    Conceptually you could have a transistor switch between your monitoring circuit and the cell, if the monitor turned off the switch the monitor would be off until some external power source powered the monitor circuit and it re-connected the cell. The transistor switch could still have some small leakage. I'm not aware of a part which does this.
    If you have questions on a specific device, please let us know.