SLVSB64I November 2011 – March 2018 TPS65217
The three step-down converters in the TPS65217x device have an internal soft-start circuit that controls the ramp-up of the output voltage. The output voltage ramps up from 5% to 95% of its nominal value within 750 µs. This ramp up limits the inrush current in the converter during start-up and prevents possible input voltage drops when a battery or high-impedance power source is used. The soft-start circuit is enabled after the start-up time, tStart, expires.