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TPS 63000 Vin question for Li-Ion battery

Mattias Rygert
Prodigy 60 points
Other Parts Discussed in Thread: TPS63000

Hi!

I have a design where I use a Li-Ion single cell battery connected to the TPS63000 device to create a +3.3V output.

 

I have read some articles where it is recommended not to discharge a Li-Ion battery to much since then it will become useless. It seems as if there could be some protection within the battery pack for this. According to the link below, the Li-IOn battery would appear dead if dischargin the battery below +2.5V

http://www.techrepublic.com/blog/five-apps/five-tips-for-extending-lithium-ion-battery-life/

 

My question is how to guarantee that the battery is not discharged below +2.5V. When I search on google, some even recommend not discharging it below +3.0V. How do you guarantee this, do I need to add external monitoring on the battery voltage to Shut Down the TPS63000 for this, or have I misunderstood how Li-Ion battery works when discharging them?

 

Best Regards!

Mattias

  • 0
    TI__Guru**** 150610 points

    Your lithium ion battery manufacturer should have guidelines for how low you can discharge their cells.  They may a protection chip inside the cell or they may require you to add one externally.  We have many gas gauge ICs and battery pack protectors that do this.  More information is found in the battery charger forum.

    Another option is a discrete voltage supervisor that disables the TPS63000 when the pack voltage is too low.