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Can TPS65070 charge 4.2V LMN cell?

Zhang Hui
Intellectual 625 points
Other Parts Discussed in Thread: TPS65070

Hello everyone,

According to the latest revision (G) of TPS65070 datasheet, the PMU is designed for Li-ion or Li-polymer battery. However, Li-ion is a broad class which further includes LiCoO2, LiMn2O4, LiFePO4(LMN), NMC chemistries, and it is not directly clear whether the PMU is suitable for all these subclasses.

The CHGCONFIG2 could set charge voltage in 4.1, 4.15, 4.2 and 4.25V. At least for LiFePO4 this is beyond their operating and max voltage; but for it appears that LiMn2O4 has 4.2V charging voltage. So I would like to confirm: can TPS65070 be used for LiMn2O4 cells?

 

A cross check with an article [Designing a multichemistry battery charger] by Keith Keller of TI confirms that LMN has 4.2V charging voltage. This is also in agreement with

[2] http://www.amitatech.com/Uploads/download/Cell%20spec%20download.pdf

[3] http://www.bixpower.com/Battery-Cell-Chemistry-Comparison-s/2325.htm

 

But does the CC-then-CV design of TPS65070 actually work for LMN batteries? Please give a definite Yes or No.

 

Hui

  • 0
    Intellectual 625 points

    It has been almost four days after the posting of this question and we are urgently wait for the confirmation. Could someone look into the problem and confirm whether the PMU works for LMN cells?

    Hui

  • 0
    TI__Genius 16870 points

    Hi,


    Yes, this should be able to work just as the same. However, this PMIC is typically meant for customer hand held devices that would probably not be LiMn2O4 but, rather a Li-Ion Poly or LiCoO2. With a LiMn2O4 battery I expect you might want more current so, it might not be best fit. I recommend you to test the battery charger by using an EVM. Make sure you are ok with charge time and performance. 


    You can buy an EVM here: http://www.ti.com/tool/tps65070evm-430