3.3 Power Architecture

Figure 6 shows the power distribution system of the EVM. The power-management solution is created from four total devices (see Figure 6). A step-down 12 V to 3.3 V, 5-V converter provides the primary 3v3 and 5v0 power rails for the rest of the system. The LP8733 and LP8732 devices are optimized for the SoC power needs and sequence requirements. A sink/source regulator provides the DDR termination.

Figure 6. Power Distribution Block Diagram

An external power supply is required to power the EVM, but is not included as part of the EVM kit. The external power supply requirements follow:

• Power jack: 2.5-mm ID, 5.5-mm OD
• Nom voltage: 12 VDC
• Maximum current: 5000 mA
• Efficiency level V

External power supply regulatory compliance certifications: recommended selection and use of an external power supply which meets TI’s minimum electrical ratings requirement and complies with applicable regional product regulatory and safety certification requirements, such as UL, CSA, VDE, CCC, and PSE.

Table 4 lists the recommended and tested power supplies that can be used with the EVM.