How to realize the UVLO hysteresis window similar to the LTC3588-1?

Dear ADI engineer

The LTC3588 has a 1V hysteresis window, which is very important for energy harvesting. Another PMU(BQ25570), it's hysteresis can be adjusted by the external resistors.  I want to realize this function in my application.  How is it working? Is there any IC provide this large hysteresis? Or is there any circuit meet this demand?

many thanks



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[edited by: PLEE886 at 9:15 AM (GMT 0) on 31 Oct 2019]
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    •  Analog Employees 
    on Oct 31, 2019 3:14 PM over 1 year ago

    Hello,

    Yes, while we don't have a part that has the actual hysteresis window configurable by resistors, you might consider LTC3330 which has a few different pin-strapped options:

    How it works (which you could implement externally if you wanted): basically have a comparator with a hysteresis window switching the load on/off. Here's a simple sketch for a comparator with hysteresis:

    You might have your supply voltage on one input and a reference voltage on the other. The comparator could drive a P-Channel FET which connects your supply to the energy harvesting circuit.

    We do sell nanopower comparators for tasks such as this; you might check out LTC1540.

    If you tell me more about your source, I can help you to pick the best approach. There may be no need to solve this with an external regulation solution.

    Regards,

    Zack

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  • 0
    •  Analog Employees 
    on Oct 31, 2019 3:14 PM over 1 year ago

    Hello,

    Yes, while we don't have a part that has the actual hysteresis window configurable by resistors, you might consider LTC3330 which has a few different pin-strapped options:

    How it works (which you could implement externally if you wanted): basically have a comparator with a hysteresis window switching the load on/off. Here's a simple sketch for a comparator with hysteresis:

    You might have your supply voltage on one input and a reference voltage on the other. The comparator could drive a P-Channel FET which connects your supply to the energy harvesting circuit.

    We do sell nanopower comparators for tasks such as this; you might check out LTC1540.

    If you tell me more about your source, I can help you to pick the best approach. There may be no need to solve this with an external regulation solution.

    Regards,

    Zack

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