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LM5170-Q1: LM5170

Tsvetan Ginin
Intellectual 460 points
Part Number: LM5170-Q1
Other Parts Discussed in Thread: TIDA-01042, LM5170, LM5171, TIDA-01041

Tool/software:

Hello team,

Can I use the LM5170 as a multi-phase buck converter to reach 300 amps at 3.65 volts? The goal is to charge a lithium-phosphate battery at 1C. Are there any other approaches for such currents besides the TIDA-01042?
?

Best regards,

Tsvetan Ginin

  • 0
    TI__Mastermind 22365 points

    Hi Tsvetan,

    The input voltage is around 12V or so?

    You may consider LM5171 which is the successor of LM5170.

    Best Regards,

    Feng

  • 0 in reply to Feng Ji
    Intellectual 460 points

    Hi Feng,

    The input power source is 12V/125A. I used the LM5171 calculator and it allowed me to enter values ​​of 300A (3.65V) for the low side and 125A (12V) for the high side. Is this realistic? If so, what drivers and MOSFETs would be needed? Are IGBTs an option? Is it possible to manipulate the chip's registers in real time to ensure the correct charging curve for the lithium-phosphate battery?

    LM5171_Buck_or_Boost_Quickstart_Tool_1.0.2_custom.xlsx

    Best Regards,

    Tsvetan

  • +1 in reply to Tsvetan Ginin
    TI__Mastermind 22365 points

    Hi Tsvetan,

    I think it make sense to use 6 phases, that is 50A/phase. In this case, you can choose MOSFET and LM5171 can drive the MOSFET directly.

    You may adjust ISET voltage to control the average current.

    Please refer to TIDA-01041 for high precision calibration control achieving 0.02% full scale current control accuracy and 0.01% full scale voltage control accuracy.

    Best Regards,
    Feng