We designed two regulator circuits on same PCB by using ADP2303 based on the example circuits in its datasheet. These regulators are manufactured to get constant 3.3 V, 5V and 3 A at the output. The input voltage applied to regulators are same,12 V.
Although 3.3 and 5 V output voltage are measured at the outputs of these regulators with multimeter, output voltage of the regulators fall down below 2 V when the arbitrary load (30, 50 Ohm) is connected to output of these regulators. That is, the regulators do not supply constant 3.3 and 5 V, when the load impedances are connected at the output of the regulators. I am sending the schematic of the two regulator circuits in the attachment. The designed regulator circuits are similar to the schematic for design example circuit in its data sheet (on page 21) except a few minor changes.
How can we solve this problem ?