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BQ24650: I_DISCHG

Beau Rogers
Prodigy 240 points
Part Number: BQ24650

Hello,

I am looking at what the BQ24650 is looking for to think that it is in float. This way, I can make a test circuit to test the BQ24650 within a circuit design (ie, not need to charge a battery to test). I see by the "Operational Flowchart" on page 21 of the datasheet, it mentions that it will "Turn off charge, enable I_DISCHG for 1 second. What is the value of this I_DISCHG? How can I take advantage of this such that a circuit can be made to trick the BQ24650 has charge a battery?

Thanks in advance.

Beau

  • 0
    TI__Guru**** 166726 points
    Beau,

    Per the electrical spec table on d/s page 8, IDISCHARGE is 6mA typical and tDISCHARGE is 1 sec. As explained in section 8.3.21, if the output capacitance is too large, the battery detection circuit using IDISCHARGE is fooled into thinking that the battery is present. So, if you use equation 9 to compute CMAX and then place larger than that amount at the output, the battery detection circuit will be disabled after the first pulse.
  • 0 in reply to Jeff F
    Prodigy 240 points
    Hey Jeff,

    Thanks, it looks like this will do the trick.