The TPS65261, TPS65261-1 has a dedicated enable pin and soft-start pin for each converter. The converter enable pins are biased by a current source that allows for easy sequencing with the addition of an external capacitor. Disabling the converter with an active pull-down transistor on the ENs pin allows for a predictable power-down timing operation. Figure 7-8 shows the timing diagram of a typical buck power-up sequence by connecting a capacitor at ENx pin.

Figure 7-8 Startup Power Sequence