BQ25896: Battery Charger max. Current Output

Den L

Part Number: BQ25896
Other Parts Discussed in Thread: TPS61089

Hi,

I'm using a USB power supply adapter which can deliver up to 3 Amps with 5V. When the USB power supply is not present, my system should be powered by a LiPo Battery. My average power consumption should be around 0.5 Amps, but I can get rare bursts of energy (thanks to LTE), which are around 2.5 Amps.

Hence the question - what is the max. current BQ25896 can deliver? I am totally confused by the datasheet, since I have no experience with batteries. It it the same as the max charge current? If not, do you have another part, which could deliver 3A peaks from a battery?

Regards,
Den

over 8 years ago

0 Jeff F over 8 years ago

TI__Guru**** 166996 points

Denis,

From datasheet page 7, the maximum discharge current from the battery to the SYS pin, where your system is attached, is 6A. The maximum charge current from the SYS pin to BAT is 3A.

0 Den L over 8 years ago in reply to Jeff F

Intellectual 990 points

Thanks!

0 Den L over 8 years ago in reply to Jeff F

Intellectual 990 points

As it seems BQ25896 cannot deliver 5V constant output, is there another part with similar parameters, but with 5V and 3A (worst case) on the Vsys output?

0 Jeff F over 8 years ago in reply to Den L

TI__Guru**** 166996 points

Denis,

The charger maximum output voltage is only slightly higher than the voltage of a fully charged battery. TI does not have a charger with integrated boost converter to provide 5V at SYS. You would have to add an external boost converter like TPS61089 on SYS to provide 5-V at 3A.

Power management

Power management forum

BQ25896: Battery Charger max. Current Output