SNVSCU3 October 2025 LM5137
PRODMIX
The soft-start feature of the LM5137 allows the regulator to gradually reach the steady-state operating point, thus reducing start-up stresses and inrush current. Program the soft-start time with a resistor from RSS to AGND. If the RSS pin is shorted to AGND, the soft-start time is 1.5ms. If the RSS resistance is greater than 500kΩ (or the pin is left open circuit), the LM5137 defaults to a soft-start time of 6.5ms.
Use Equation 3 to calculate the RSS resistance for a given soft-start time.