Hi
We have a design where we use two TPS62300 to provide 1.1 V and 3.3 V. The schematic is shown in the first attachment. The problem is that the 3.3 V output has noticeable drops, se attachment #2. The problem appears when both regulators are loaded with a pure resistive load of 33 and 2.2 ohm for the 3.3 and 1.1 V respectively. The problem disappears if I disconnect the load from the 1.1 V output and the behavior is related to a limited range of loads, attachment #3 shows the behavior when the 1.1 V is disconnected. The behavior also disappears if the input voltage is increased to about 6 V.
We haven’t been able to find the source of this problem and would be thankful if somebody could help us.