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bq24103 VTSB = 8.4V problem

Bartlomiej Swierczek
Prodigy 100 points
Other Parts Discussed in Thread: BQ24103, STRIKE

Hi,

 

I am using the typical 2-Cell 1.33A bq24103 charger aplication from datasheet.

One of our product was returned witch non functional charger - symptoms was:

Charging current = 5mA when Battery voltage is about 7V, STAT1 LED is ON

 

other component values and voltages

RSNS = 0.1R

L = 10uF

Vstat1 =  1V (Rstat1 = 7.5k)

VTSB = 8.4V

Vstat2 = 4mV (Rstat2 = 7.5k)

Ctcc = 100nF (TTC pin triangle waveform is present: Vlo = 0.5V Vhi= 1V)

and VTSB = 8.4V

charger IC is hot

 

whether such high  vtsb voltage  means that the charger is broken?

Have any suspicion of what might have caused this?

 

 

  • 0
    TI__Mastermind 31120 points

    Sounds like the charger is damaged.

    I would suggest that you wait and see if there are more returns and if so we can do an FA on it and try and see what may have caused the damage.

    We typically do not see damage to the TS circuitry and sell millions of ICs, but it may be that your layout or enviornment are conducive to failures and if this proves to be the case it may be solved with a 0.1uF capacitor on the TS divider (assuming that an ESD strike to the TS contact is the issue).