I am, very much so. If I have 80 of these all drawing 5ma (is that at 24v or 5v?) 0.005*5*80 that's 2W at 5v or 9.6W at 24v.
5mA or more at 24V. The specs are a bit vague.
There definitely are regulators that have low power modes, but the majority of these will be lower input voltage regulators. 24V input greatly reduces the choices.
Look at the lt3970 (
http://cds.linear.com/docs/Datasheet/3970fb.pdf ) or the LT3990.
These regulators can drop down to microamps of current at very low powers. And they will work fine with your 220uH inductors.
This is good value
http://ww1.microchip.com/downloads/en/DeviceDoc/25004A.pdfRichard
Ok I went for the LM2574. Now it's all quite and working great. And on top of that I have one less component than before.
It just goes to show that putting a circuit together is more complicated than just slapping a few bit together and pray.
Anyway thank you for your help.
Jfp.