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LP87524B-Q1:damage

Part Number: LP87524B-Q1

I have been confused about the cause of the damage of lp87524. When I saw the datasheet described it has a lot of protection, such as overvoltage, overcurrent, over temperature, etc., but I have encountered frequent damage problems, mainly divided into the following:
1. When connecting JTAG for debugging, everything looks normal, but once power is turned on, it will find that 3.3V has been short-circuited and cannot be started.
2. When I was testing with a multimeter, I accidentally shorted the 1.2V output of sw1 to input 5V, and then sw1 was damaged.
I want to know what caused the damage and I can't find the cause of the damage. Thank you

  • I may not have said the first point above. I mean that the debugging process with jtag is normal. When the power is turned off and then powered up again, the 3.3V of lp87524 is shorted.

  • Hello,

    Sorry to hear your troubles with LP87524.

    If there is hard short introduced from the SW pin to GND or to VIN it is possible the current surge or voltage spiking due to inductances causes damage to the device. There is no protection scheme that will protect the device from damage if SW is shorted to GND or VIN during operation since the event is so fast for fault detection.

    Hope this helps.

    Thanks.

    Regards,

    Tomi Koskela