Hi.
The LM317 data sheet (figure 36) shows a 2-terminal current limiter circuit using an LM317 and one resistor. I've used this circuit and it's great, but now I need a version of it with less voltage drop across the regulator. At 22mA, the LM317 dropout volts are about 1.25 to 1.75V (temp depending).
I want to make a similar 2-terminal 22mA current limit circuit using an LDO.
With the much smaller dropout voltage of an LDO, this circuit would behave more like the resistor alone, up to 22mA:
V(2-terminal circuit) = I * R + small Vdrop (up to 22mA)
For V(2-terminal circuit) > 22mA*R + small Vdrop, the circuit will act like a 22mA current source.
Which TI LDOs can be used this way?
I want it to float (no ground pin), and no capacitors. Just an LDO and a resistor.
Thanks!
