SNVSB29C October 2018 – June 2021 LM5143-Q1
The LM5143-Q1 contains two enable inputs. EN1 and EN2 facilitate independent start-up and shutdown control of VOUT1 and VOUT2. The enable pins can be connected to a voltage as high as 70 V. If an enable input is greater than 2 V, its respective output is enabled. If an enable pin is pulled below 0.4 V, the output is shutdown. If both outputs are disabled, the LM5143-Q1 is in a low-IQ shutdown mode with a 4-µA typical current drawn from VIN. TI does not recommend leaving EN1 or EN2 floating.