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 LM26420X 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?
↧