How are you measuring the output to determine it is shorted? The output of the if is ~ 2 to 5 ohms if measured with an ohm meter.
hello，I just mesured the input voltage of PA which shorted to gnd
more introduction, I measured the resistance at input of PA is 6.8ohms, not the output side, always broken suddenly when it is working normal .
the current of PA is higher than350mA, does it normal?
When are you seeing the high supply current. When you turn the PA on or, during drive? Attached is a curve of supply current vs. output power. under drive the current will climb.
Can you share layout details of your board? How many layers, number of vias in the ground paddle under the ADL5605?