SLVSDF7A December 2016 – July 2017 TPSM84A21
The TPSM84A21 has a pre-programmed soft start time of 4.1 ms (typ). The soft start time is the time it takes for the output voltage to rise from zero volts to the voltage set by the RSET resistor. Soft start is an important feature that limits inrush current and reduces the load on the input supply to this device. During soft start, the internal reference voltage is slowly ramped up to the internal reference voltage. This slowly increases the commanded output voltage of the converter and reduces the initial surge in current. During soft start PGOOD remains low, the PLL is not active, and output UVP/OVP faults are disabled.