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TPS5410: Reverse current of TPS5410

Sajjad Akram
Prodigy 10 points
Part Number: TPS5410
Other Parts Discussed in Thread: TPS54531,

HI, TI community. I have just a simple query and i hope some of you can answer it.

I ordered TPS54531 to charge lithium cell. this circuit with charge the lithium cell and after that charging will be disabled via Enable pin. Then a discharge circuit will discharge the battery at constant current and a micro controller will measure its battery capacity.

The problem is that when i disable the charging, there is a reverse current from the battery to the circuit ( Dont remember how much) enough to disturb my battery capacity measurement. In TPS54531 Data sheet its written for battery charging but as you can see that if the battery remains in the circuit, it will be discharged eventually when charging is stopped.

Now i have ordered TPS5410, its a 1 Amp chip but still no mentioning of reverse battery current. Any ideas?

Another thing that i have ordered 3 AMP diode just in case if reverse current exist then i will put it at the input of the TPS5410.

  • 0
    TI__Guru**** 191445 points

    Generally speaking, I think it is not intended to use TPS54531 to directly charge the battery.  Rather it can be used as the power source in conjunction with a dedicated battery management circuit.  There will always be a discharge path to ground through the feed back resistors.  Additionally, if the output voltage, in your case the battery voltage, is higher than the input voltage to the converter, there will be an additional discharge path through the internal FET body diode.  If you use a diode, it would need to be placed in between the power supply output and the load (battery) to block those two discharge paths.  I do not think TPS5410 would offer any particular advantage over TPS54531 in your application with respect to possible discharge paths.

  • 0 in reply to JohnTucker
    TI__Guru**** 191445 points
    Also, Have you looked into dedicated battery charge / management ICs? TI has a large portfolio of them.