For the next three cases, the regulator used for VCCINT and the external FET used for Buck 2 will vary depending on the exact power requirements, as shown in Figure 6-2, Figure 6-3, and Figure 6-4. For a general selection guideline based on Zynq UltraScale+ devices, see Table 6-2. Please note that several configurations can be applicable to a given device, depending on the use case.

Note that the external FETs on Buck 1 and 6 can also be modified depending on the load current requirements. Please see the Selecting the FETs section of the TPS650864 data sheet for more information on FET selection.

Figure 6-2 shows an example power map for the Power/Efficiency Optimized configuration. The rails shown follow the settings of the pre-programmed TPS6508641; however, as discussed in Section 5, the TPS650861 can also be used to power this configuration.

1. See Table 6-2 above for VCCINT regulator and Buck 2 FET selection guide.
2. For EV devices: if using the TPS650861, set either Buck 4 or 5 to 0.9 V. If using the TPS6508641, add the TPS543620 discrete buck to power the VCCINT_VCU rail.