I am using this IC - LIN Mini system basis chip - TJA1128
Using the LDO in that IC to generate 3.3V with 50mA of load current. I see that the maximum output current capability of the IC is 85mA.
But where to find the data on what will the maximum current during short circuit conditions?
Is it on the page 26 table - Io(sc) - Short-circuit output current = -200mA to -85mA. (If this is it then why have they indicated with the negative sign?)
I tried to short my 3.3V to ground for a brief 150ms, I get around 180mA (measured using scope with a current probe).
Shorting just by tapping the wires and doing it manually.
My questions :
- Where to find the data regarding the maximum LDO short circuit output current? Is it the one which I have mentioned. If so, why have the given in negative figures?
- How does the IC limit the current to only that much? What is the internal mechanism?