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LT3471 Shutdown

I am attempting to run a dual power supply using this device and the supply itself works, however when I attempt to shutdown the power supply the negative rail goes to 0V but the positive sits just below the input voltage. Is this normal operation or is there something I should be doing to properly shut down both outputs? 

  • Hi Corrin,

    There is a direct path from VIN to VOUT on the positive output so at shutdown, there will always be VOUT that is a diode lower than VIN. You need a disconnect circuit to achieve what you want.  Or opt to look at other solution like ADP5071 that has inherent input disconnect switch. Please check the output current requirements are met.