Microchip offers a regulator which could be used as a power supply turn off
device.


http://www.microchip.com/1010/pline/analog/anicateg/power/linereg/tc1xxx/tc1017/

Some nice specs.
SC70 package (half the size of a SOT-23) makes it awkward for one off use
;-).
The sad part is that it has NONE voltage output variants from 1.8 to 4 volts
BUT no 5 volt version AND input is 6 volts maximum.

Apart from those limitations the 0.5 UA max Iin in shutdown (0.006 uA
typical) and 285 mV max voltage drop at  150 mA (full load) make it a worthy
competitor to the LM2936.

Anyone know of a device with:

Good Vin max
Good Iin max
Low drop out
Shutdown with sub microamp drain.
Good range of output voltages (or programmable)
Good price.
Useful packaging.


?


        Russell McMahon

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