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LM26420 Enables

Rod Guthmueller
Prodigy 40 points
Other Parts Discussed in Thread: LM26420

I am using an LM26420 to generate 1.2V and 1.9V supplies. Vin is 5.0V. I want to use 3.3V from another switcher to enable the LM26420. I tried a resistor divider to turn the LM26420 outputs on when the 3.3V supply reaches about 75%, but the device didn't turn on. I tied the enables directly to the 3.3V supply but the device still didn't turn on. It only turns on when I use the 5.0V input to drive the enables. What am I missing?

  • 0
    TI__Genius 15810 points
    Not sure. Would you send us your schematic? If I understand correctly, you are trying to sequence one LM26420 after another LM26420? Or is the other switcher a different part number?
    You could probe the voltage at EN to see if it is above the threshold.

    Regards,
    Akshay