BQ24074: Charger does not stop charging when the terminate current is reached

Felipe Schneider

Part Number: BQ24074

Hello, I am having a big headache with a charger circuit that I have design for my application. The circuit is presented by the circuit below.

The battery is reaching 4.4V and the charging current goes as low as 30mA (or even less) without stopping the charge.

I tried to:

Change Rterm to 10k;
Remove Rterm.
Connect TMR to GND
Short the current sensor and the choke to reduce the impedance.
Add a 4.7uF in parallel with C2 (close to the BQ).

Any advice is much appreciated.

4 months ago

+1 Garrett Kreger 4 months ago

TI__Mastermind 21725 points

Hi Felipe,

This appears to be a duplicate thread to the one I have linked below with one additional piece of information regarding adding a capacitor at BAT pin.

We do strongly recommend you have at least a 4.7uF capacitor at BAT pin placed close to the IC in your design.

https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1333355/bq24074-charger-does-not-stop-charging-when-the-terminate-current-is-reached

For future discussion lets continue in the original thread. Please consider this thread closed.

Best Regards,

Garrett

0 Felipe Schneider 4 months ago in reply to Garrett Kreger

Prodigy 30 points

Let's close this one and just keep the other thread. I will collect the waveforms and update that thread.

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BQ24074: Charger does not stop charging when the terminate current is reached