An under-voltage lockout (UVLO) circuit configured for indicating that an electronic device may be enabled and disabled based on threshold levels of a power supply voltage. The UVLO circuit has a non-differential comparator configured to have a fixed threshold voltage. A voltage divider having a first terminal connected to the power supply voltage and configured to adapt a compare signal applied to the non-differential comparator to be proportional the power supply voltage such that a desired threshold voltage for the power supply voltage causes the non-differential comparator to change its output state. The UVLO circuit has a hysteresis controller configured for adjusting the compare voltage such that the power supply voltage has at least two threshold voltages to cause the non-differential comparator to change states. The non-differential comparator comprises a flipped gate transistor with a gate-to-source threshold greater than a normally gated transistor.