Soft-start circuitry is integrated into the device to avoid high inrush current spike during start-up. After the device is enabled, the GM amplifier output voltage ramps up very slowly, which ensures that the output voltage rises slowly to reduce the input current. During this period, the switch current limit is set to 0.72A. After around 6.5ms, the switch current limit changes back to I_LIM, and the FB pin voltage ramps up to the reference voltage slowly. These features ensure the smooth start-up and minimize the inrush current. See Figure 7-9 for a typical example.