Figure 7-7 shows the automotive TPS6521920W-Q1 variant powering the AM62x-Q1 processor on a system with 3.3 V input supply and LDDR4 memory. Buck1, Buck2 and Buck3 are used to supply VDD_CORE at 0.75 V, 1.8 V VDDSHVy IO and 1.1 V DDR IO respectively. The 3.3 V coming from the pre-regulator can be combined with a power switch to supply the 3.3 DVDDSHx IO domain. This external power switch will be enabled/disabled by the PMIC and must have an active discharge. The GPO2 is pre-programmed to be enabled in the second slot of the power-up sequence with a duration of 10ms. It can be used to enable the external power switch and meet the processor sequence requirements. The switch must be selected with the right electrical spec to ramp and provide a stable output voltage within the 10 ms duration of the second slot (before the PMIC start the next slot in the power-up sequence). LDO1, configured as bypass, allows dynamic SD card voltage changes between 3.3 V and 1.8 V. This voltage change on LDO1 can be triggered setting the VSEL_SD pin high (LDO1=3.3 V) or low (LDO1=1.8 V). LDO2, is used to supply the VDDR_CORE. LDO3 supports the 1.8 V analog domain. LDO4 is configured to output 1.2 V and can be used to supply the HDMI transmitter. GPIO and GPO1 are free digital resources that are disable by default but could be enabled through I2C if needed.

The TPS6521920W-Q1 also supports 5V input supply. When using VSYS = 5 V, replace the external power-switch with a 3.3 V Buck converter. This external buck converter is enabled by the same PMIC GPO2.