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LP87524B-Q1: LP87524-Q1 Buck0 shutdown

Genius 4720 points
Part Number: LP87524B-Q1

1. When VANA>UVLO and EN is high and NRST is low ,In this condition ,I think that all the regulators are disabled immediately, and all the register bits are reset to the default values.

    Is my understanding correct ?

2.They would like to increase Buck0 Shutdown delay,this part can be set  Shutdown delay up to 30ms by OTP set.

   Can they set Shutdown delay time over 30ms ?   If they can ,please let us know how to set.

3.They would like to keep Buck0 voltage as long as possible in shutdown.

   If they place diode between L0 and Cout0,Does this part work correct ? please give us your comment.

   Please let us your idea  to keep Buck0 voltage as long as possible in shutdown.

  • Hello Kura,

    1. Yes, that is correct.
    2. Only way to route one of the GPIOs to enable and use GPIO as output with startup delay. So you would get GPIO startup delay (max 30ms) + normal startup delay (max 30ms)
    3. I wouldn't recommend placing diode between L and Cout. You could set slew rate as slow as possible.

    Thanks,

    Best Regards,
    Tomi Koskela