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BQ24610: BQ24610 how about output resistance of the bq24610?

user4852401
Prodigy 125 points
Part Number: BQ24610

Dear ti,

        I have read the slua585 design resources，there is a  description of a paragraph  in the below

in the slua585.pdf .

For stand-alone charger, it not only has a LC resonant range, but also has Cmax_wake or Cmax_dis
calculation which is derived from the battery detection parameter [see bq24610 data sheet (SLUS892)]. If
the output capacitor is over Cmax, the status pin will flash even when battery is absent.
Also, if the resistance is too high between charger output and battery terminal, the charger will run in and
out of charger termination.
Rbat_max = Vrch/Iterm
Vrch: Recharge threshold voltage; mV/Cell
Iterm: Termination current.

the Rbat_max is the battery internal resistance ? or the resistancecharger output and battery terminal ? or The sum of the two ?

  • 0
    TI__Genius 10240 points
    Hi Sea,

    The Rbat_max in the application report SLUA585 is related to the recharging threshold Vrch. When the current Iterm flows due to the battery voltage drops to the Vreg - Vrch, the voltage at the BAT terminal increase due to (Rbat-max) x Iterm reaches Vrch, so the charging is terminated right after the charging starts. The Rbat_max is the resistance causing the voltage increase, so it is the sum of battery internal resistance and the resistance between charger BAT pin and the battery terminal.