9V NiMH Battery Charger Circuit

[manve_13]

Hello I want to add a battery charger to my existing design.

Now I have a PIC18F4620 at the design. and it gathers some data from various sensor and sending it to the computer with RF. My system works with 9V NiMH battery and I want to charge it with usb. I need to implement a smart charger into the design, as i searched i've found TI BQ series.

Is there anyone who used this IC before? There are lots of different version of this series. I couldn't figure out exactly which one can be most suitable for me.

Thank you.

 

[BradtheRad]

My system works with 9V NiMH battery and I want to charge it with usb.

This stands out in particular. USB works on 5V. It is not able to charge a 9V battery.

Do you have an existing step-up circuit to 9V or 10V? Or is this what you are asking for?

 

[manve_13]

Yes I'm going to use LM2577 to boost the 5V. I'm going to charge the battery around 100-150ma so I think its going to be enough

Edit: I've found out that, bq2000 can be useful for me. Has anyone tried this ic before?