> Does anyone make an LDO with low-voltage cutoff? Parametric searches
> and Google seem to be failing me.


If you can't find an all in one solution:

Some=A0regulators have shutdown pins. Shutting down the regulator when
Vout OR Vin got too low would work.

This may be able to be just 2 x r plus a bipolar.
Almost certainly precise enough for this task.
Check at desired temperature extremes.
3 small components.

Or a power supply monitor IC driving shutdown.
Possibly 1 small (3 pin) device.

Or 2 x R and a TLV431 or TL431. Or (extra points) a bipolar and 2 r's
connected to shut down when Vdropout got too low. (Noting  that
Vdropout MAY increase in dropout with some ICs).

For a regulator with no disable a preceding bipolar or FEt with
appropriate drive. Boy count getting up BUT one bipolar and 2 x R may
suffice.

 Russell

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