LTC6953 unused outputs

Hi all

i use the LTC6953 device in my board, is it possible to keep VOUTx+ supply pins floating if the x output is unused?

i want to make sure the unused outputs are shutdown with no current consumption at all..


  • +1
    •  Analog Employees 
    on Sep 23, 2020 11:25 PM 2 months ago

    VOUTx+ should be connected to the supply.  For a full power down select PDx=3 in the register map.  The pins will not consume current, but will read 3.3V due to the resistors to Voutx, see figure 3 in LTC6953 datasheet.

    You may want to consider setting the pin !SD=LOW on power up (power downs IC), then program the SPI registers PDx=3, then set !SD=HIGH.  This will avoid having these outputs on during initial power up.

    Hope this helps.