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Not true but there site can be awful to find things!! I will go hunting in my bits box, because I have such a beast from them, its a single chip solution with power good out put pin, it was used on a board to shut down the energy harvesting side when the power dropped below 5V and switch over to battery back up, so they do have the part, the tricky bit is finding the part numberThanks, but they're all Switch mode regulators. I need to keep component count down and would prefer an LDO that simply does not output any voltage below 5V or at least >=4.5V
The switching threshold voltage of the LT1521 shutdown pin has a massive range (from 0.25 to 0.75V), so you'd have to tune your resistors for every device you used.https://www.linear.com/product/LT1521
Add a resistive divider circuit for your 5Vdc source (to achieve the slightly greater than 0.25Vdc needed) with its output to the SHDN pin.