This thread has been locked.
If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.
Hello. I have been using the LMP92066 in a few IRAD programs and now hopefully in production hardware. In two boards the -5V pin has shorted (1.7 ohms) and the devices are drawing excessive DC current. Those devices are now damaged. Is the device turn on dependent on power supply sequence? Should I turn on -5V first, then +5 or +5V first and then -5V? Your help is appreciated.
Hi,
Are you talking about VDDB (+5V) and VSSB(-5V) supplies here?
For -5V operation, VDD should be +5V, VDDB should 0V, and VSSB should -5V. At POR the output should follow the VSSB supply to -5V.
Basically VDDB - VSSB should be max 5V
Regards,
AK
Hi Christopher, can you confirm that you have grounded VDDB? Connected VDDB to +5V will likely damage the device as you described.
Hi Christopher,
The device does not require a specific sequence for the supply ramps. Can you share your schematic? Maybe that would give us some hints.
Thanks,
Paul
Hi,
In your schematics, VIO is connected to 5V (P5P0V) ?
Recommended VIO voltage max is 3.6V. Please change the same to 3.3V. Also VDD power supply must be capable of sourcing at least 50mA current.
Regards,
AK