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Linear Technology LT1963 1.5A LDO - Output current no more than 100mA!
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bson:
Shouldn't you connect the output - rail to ground?
hgg:
It is connected to ground when the MOSFET is ON and because the gate is connected
to 2.6V, its always ON.
Kjelt:
Is it me or is your diode reversed ?
Jay_Diddy_B:
Hi,

In this picture I can't see a connection between the two negative rails and the two positive rails:



You have to connect them like this:



Regards,

Jay_Diddy_B
hgg:
kjelt, you are right, I have updated the schematic, but in reality the LED is properly connected.
Jay_Diddy_B  The upper rail is the 4.2V power supply rail and the lower one is the LDO 2.6V output rail.
I have only connected the grounds together.  Here is another photo with the MOSFET in circuit:



The MOSFET works as expected, gate to 2.6V LED is ON and gate to ground LED is OFF.

But when the MOSFET is on, the 2.6V power rail becomes a 3.2V rail...
Does it affect the LDO ADJ pin voltage divider? 
Because the ADJ voltage changes as well to a higher value.

Strange.  Please help...   :-[

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