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TPS61200: Alternative Product or Combination of product for MPPT enabled Energy Harvester to Manage Battery LiFePO4 without coding

Mohit Garg48
Prodigy 40 points
Part Number: TPS61200
Other Parts Discussed in Thread: BQ24070, BQ25570, BQ25505, TPS61131

Hello

Thank you for picking up this post. I am designing a circuit which is powered by a single mini Solar Panel and has a backup of a single LiFePO4 Battery. These two things are fixed and critical to the circuit. Till few days ago I was using a LiPo Battery instead of LiFePO4 Battery and was using a combination of TPS61200 and BQ24070. But now I have switch to LiFePO4 and I am unable to find a positive alternative.

The Solar Panel I have to use is V(Nominal) = 5.5v V(Max) = 6.5v Power = 2W (2.5W Peak).

The LiFePO4 is 3300mAh

I request if anyone can help me with a IC or Combination of IC's or IC's with external reference Circuit like in SLVA345 using TPS61200.

Thanks and Regards

Mohit

  • 0
    TI__Mastermind 40080 points

    Hi Mohit,

    What is positive alternative mean?

  • 0 in reply to Helen chen
    Prodigy 40 points

    Hello Helen

    Thank for considering the post. By Positive Alternative I just mean if anyone can suggest me some alternative Component or Combination of Components which can help me with my aforesaid situation. I am looking for Power Management IC which can Harvest Energy (Boost Switching Voltage Regulator with MPPT should also work)  from a DC 5.5v Solar Panel (Maximum Volt can go upto 6.5v) and Manage Charging of a LiFePO4 Battery (3.2v Battery, Charged at 3.6v).

    Thanks and Regards

    Mohit

  • 0 in reply to Mohit Garg48
    TI__Mastermind 46905 points
    Hi Mohit,

    The TPS61200 is a boost converter, which means VIN is always lower than VOUT. but in your application the input is always higher than VOUT. so boost is not required.
    I changes this post to the charger forum. they may has a device that has MPPT function.
  • 0 in reply to Jasper Li
    Prodigy 40 points

    Hi Jasper

    Thank you for consideration and assistance. I understand that I may get better response at Charger Forum as you explained.

    But there is small matter that the solar panel may not always provide Volt higher than output. The situation is usually it will be at around 3v-4v or 4.5v. It's only occasionally on a clear day and high sun that it will surpass 6v to max 6.5v. that's the issue I am facing.

    Any IC which can boost but also take on upto 6.5v occasionally will work for me. MPPT is kind of feature I require, so an IC with MPPT or even an FB node which can take upto atleast 6.5v should work for me.

    Thanks and Regards

    Mohit

  • 0 in reply to Mohit Garg48
    TI__Guru**** 166436 points
    Unfortunately, the bq25505 and bq25570 boosting chargers with MPPT cannot handle 6V at their input. One idea would to be add an MPP circuit like www.ti.com/.../slva345b.pdf to a SEPIC converter like TPS61131. This configuration would only provide constant voltage (CV) portion of charging but not constant current. However, as long as the maximum output current from the SEPIC is below the batteries 1C charge rate, I see no issue because the MPP circuit will be limiting the output current.
  • 0 in reply to Jeff F
    Prodigy 40 points
    Hello Jeff

    Thank you for responding to the post and a very helpful advice. I think that will help me out in the situation.

    Regards
    Mohit