SNVSB29C October 2018 – June 2021 LM5143-Q1
The LM5143-Q1 includes output voltage monitoring signals for VOUT1 and VOUT2 to simplify sequencing and supervision. The power-good function can be used to enable circuits that are supplied by the corresponding voltage rail or to turn on sequenced supplies. Each power-good output (PG1 and PG2) switches to a high impedance open-drain state when the corresponding output voltage is in regulation. Each output switches low when the corresponding output voltage drops below the lower power-good threshold (92% typical) or rises above the upper power-good threshold (110% typical). A 25-µs deglitch filter prevents false tripping of the power-good signals during transients. TI recommends pullup resistors of 100 kΩ (typical) from PG1 and PG2 to the relevant logic rail. PG1 and PG2 are asserted low during soft start and when the corresponding buck regulator is disabled by EN1 or EN2.