LM66100: LM66100 Reverse Current Blocking

Part Number: LM66100


Hi,

In my current design, I’m using three Li-SOCl₂ batteries connected in parallel. This battery pack does not tolerate reverse current. Initially, I used a Schottky diode for protection, but the voltage drop was too high (starting around 0.2 V and reaching up to 0.4 V depending on the current). Because of this, I began researching ideal diode controllers and came across the LM66100, which seems like a possible solution to this problem.

For simplicity, here’s a basic outline of the power input section:
Battery Pack → LM66100 → Super Capacitor → Boost/Buck Converter

However, I need some help understanding the LM66100 better:

  1. When is the reverse-current blocking function activated? And how much current (if any) flows when it is active?

  2. For reverse-current blocking, the CE pin needs to be connected to VOUT, correct? During current-blocking mode, is reverse-polarity protection also active?

  3. In this mode, what is the expected voltage drop across the device?

  4. If the LM66100 is not suitable for this application, could you suggest any alternative components?

Thank you!

  • Hi Miguel,

    You can use LM66100 for reverse current blocking.

    1. This is the max reverse current that can flow before turning-off the path.

     

    2. No, for that please add a 1k resistor in GROUND path.

    3. It will be I*R. Resistance in mentioned in datasheet at different voltage levels.

    4. For such low voltage range, we dont have other controllers. 

    Please refer to LM66100 EVM as well.

    Regards,

    Shiven Dhir

  • Hi,

    Thanks for the reply! 

    1. Isnt that too much reverse current ? 0.5-1 A seems to not protect much or Im misinterpreting this ?
    2. Thanks!
    3. Thanks!
    4. Thanks!

    Thanks again! I will also take a look at LM66100 EVM

  • Hi Miguel,

    I understand it may be too much reverse current but if the voltages are fast changing i.e VOUT goes higher than VIN quickly, then its fine. If the slew rates are low, it will be an issue. Unfortunately we dont have an alternative as well.

    Regards,

    Shiven Dhir