Hello!

I'm trying to implement a battery charger using TI's BQ2054. However, I'm stuck at charge pending state. I disabled temp monitoring according to the datasheet, that's why I can't figure out why I'm getting stuck there.
Also, I'm not sure about what I am supposed to do with the MOD pin.

Can someone point anything I might be doing wrong?

Thanks


PS: The battery is a Turnigy 3600mAh 3Cell 11.1V.

 

First, please post a schematic. Nothing much will happen without one.

Second, the MOD pin is the control for a switch in a switching regulator that controls current to the battery being charged. If you don't know what this pin is for you really really need to post a schematic.

I have built several lead acid battery chargers using the BQ2031. It is very similar to the BQ2054.

Mark

 

Here is the schematic.

(This is my first time working with battery chargers so I'm feeling a little bit lost.)

Thank you!

 

rfitas
Your circuit is missing the switching power supply that charges the battery. Attached is an app note that should explain it.

Mark

 

rfitas
The BQ2054 is a battery charger controller and a controller for a switch mode power supply (SMPS). The SMPS handles the high current that charges the battery. The SMPS is what is missing from your circuit.

Mark

 

That has given me an idea, I will adapt it to my application.

Thank you very much.