I'm designing a battery supply to go into a bluetooth speaker. Having never worked with Li-ion cells before, I've done some research and understand that they need to be load balanced and protected from over-voltage or they explode.

I've found the TI bq2920x IC. Which they suggest using in this configuration:

enter image description here

Am I correct in thinking that building this circuit should be enough or is additional protection required?

My design must be able to output 5V and 1A.

I'd also appreciate it if someone could clarify if PACK+/- are the two power terminals and if OUT is the PSU output voltage?


The bq2920x IC is a smart battery fuel gauge chip useful for longevity of the battery but does not offer any safety features, per se. The Typical App does show some protection for current flow direction with a dual FET which can be purchased.

PACK +/- are on the same voltage Nodes as Cell2+ and Cell1- ( i.e. direct connection. )

  • \$\begingroup\$ The data sheet states that it offers "Automatic Cell Balance" and "Overvoltage Protection" could you please elaborate on what I'm misunderstanding? \$\endgroup\$ – Persistence Dec 8 '18 at 20:44
  • \$\begingroup\$ I dont see what you are reading and this IC is obsolete for new-design. This is a smart sensor but no actual controls for regulation \$\endgroup\$ – Sunnyskyguy EE75 Dec 8 '18 at 20:53
  • \$\begingroup\$ This: ti.com/lit/ds/symlink/bq29200.pdf but okay. I'll keep looking elsewhere. Cheers! \$\endgroup\$ – Persistence Dec 8 '18 at 20:55

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Not the answer you're looking for? Browse other questions tagged or ask your own question.