Li-Ion Protection Circuit

Discussion in 'The Projects Forum' started by kingofkeys, Dec 11, 2012.

  1. kingofkeys

    Thread Starter New Member

    Aug 28, 2012
    Li-ion batteries need protection circuit to take care of over voltage, under voltage and over current.

    I am using this IC to build a protection circuit.

    However, I am confused as to how to set the over current limit. I was expecting an external resistor value to control the over current limit, but that doesnt seem to be the case.

    How do I set the overcurrent limit for the IC above?

    Some please help, this is very urgent.
  2. toffee_pie

    Senior Member

    Oct 31, 2009
    the datasheet is a mess, it seems different products have different OC thresholds, just get a single cell lion IC from Ti, (which i am familiar with)
    must easier to configure.

    the sense resistor is used for SoC mainly, a sense resistor that can handle the maximum discharge current the pack is exposed to would be selected, say 5/10mill ohms.

    for Ti fuel gauges the OC limit can be set for the different levels, ie level 1 and AFE.

    look into Ti fuel gauges, much more common and mature tech than the one you listed.