ZHCS571I August 2010 – April 2018 LM5119
PRODUCTION DATA.
The LM5119 contains an enable function allowing shutdown control of channel2, independent of channel1. If the EN2 pin is pulled below 2 V, channel2 enters shutdown mode. If the EN2 input is greater than 2.5 V, channel2 returns to normal operation. An internal 50-kΩ pullup resistor on the EN2 pin allows this pin to be left floating for normal operation. The EN2 input can be used in conjunction with the UVLO pin to sequence the two regulator channels. If EN2 is held low as the UVLO pin increases to a voltage greater than the 1.25-V UVLO threshold, channel1 begins operation while channel2 remains off. Both channels become operational when the UVLO, EN2, VCC1, and VCC2 pins are above their respective operating thresholds. Either channel of the LM5119 can also be disabled independently by pulling the corresponding SS pin to AGND.