Hello,
My customer seems to have the same issue as reported before by this.
My customer has been using the same PCB with LMH1983 for >7 years on several products, but they have never had unlock issue in the past. They've started using the same PCB on a new product since 2019, but they've never had unlock issue until quite recently. It seems if they swapped the 47uF tantalum to a another one, it has fixed the unlock issue, so I'm asking them if the unlock issue will go with the capacitor or the combination of capacitor and LMH1983, but do you have any more information from the above post? What items (i.e. capacitance tolerance, ESR etc) would be required for the 47uF capacitor?
Best Regards,
Yoshikazu Kawasaki