[BQ24079] Additional power path for IN to OUT

Tiger Yeh

Other Parts Discussed in Thread: BQ24079, BQ24266, BQ24079T

Hi,

Because customer need to have 3A output for system, BQ24079 maximum input current is only 1.5A. Thus, customer would like to add a schottky diode to enhance output current between IN and OUT pin.

Does this design okay? Any side effect or concern?

2161.Charger solution_0915.pdf

over 9 years ago

0 Jeff F over 9 years ago

TI__Guru*** 143820 points

This has not been tested. My concern is that the IC will current limit at 1.5A, then try to enter supplement mode and connect BAT to OUT. OUT would be a diode drop below IN which would exceed the battery voltage and damage the battery.

Is changing to a 3A switching charger like bq24266 possible?

0 Tiger Yeh over 9 years ago in reply to Jeff F

TI__Expert 4265 points

Thank you very much, Jeff.

Yes, BQ24266 is good for the application.

0 Jim Maeder over 9 years ago

Prodigy 40 points

I have developed a Li-Ion recharging/protection circuit based on the bq24079T. It does not work with batteries that include a protection circuit. How do you get around this?

Jim

0 Jeff F over 9 years ago in reply to Jim Maeder

TI__Guru*** 143820 points

Is the TS pin properly biased? If so, then how much current does the protect require to close its switch?

0 Jim Maeder over 9 years ago in reply to Tiger Yeh

Prodigy 40 points

I have a functioning charger circuit based on the bq24097T. I am having trouble finding a battery and holder combo to use with it because of the protection circuits. What did you use for a battery and holder?

0 Jim Maeder over 9 years ago in reply to Jeff F

Prodigy 40 points

Yes, the TS is properly biased. I do not know what the configuration of the protection circuit.

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[BQ24079] Additional power path for IN to OUT