SCEA113 October   2021 TPS650861 , TPS650864

 

  1.   Trademarks
  2. 1Introduction
  3. 2TPS65086x Overview
  4. 3TPS65086x Variants
  5. 4TPS65086x Selection Guide
  6. 5TPS650861 Programming Information
  7. 6Example Power Maps
    1. 6.1 Always On: Power and Efficiency Optimized (-1L and -2L devices)
    2. 6.2 Always On: Cost Optimized (-1 and -2 devices)
    3. 6.3 Always On: PL Performance Optimized (-3 Devices)
    4. 6.4 Full Power Domain (All speed grades)
  8. 7Conclusion

6.2 Always On: Cost Optimized (-1 and -2 devices)

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.

Table 6-2 VCCINT and FET Selection Guide
Device VCCINT Regulator Buck 2 FET
ZU2 - ZU5 (CG, EG) Buck 2 CSD87381P (<15 A)
ZU4 EV
ZU6 - ZU9 (CG, EG) Buck 2 CSD87588N (<25 A)
ZU5, ZU7 EV
ZU11 - ZU19 (EG) TPS543B20 (<25 A) CSD87381P (<15 A)
TPS543C20A (<40 A)

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.

Figure 6-2 Always On, Cost Optimized Power Map Using TPS6508641 or TPS650861
  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.