2 System Overview

Figure 2-1 shows the TPS65386x-Q1 powering the AM261x MCU on a system with 12V input supply from a battery. The 12V coming from the pre-regulator connects to the power input of the buck-boost converter (VBATP). The buck-boost converter supplies an external buck converter (VESPA) at 4.3V, 5V, and 6V. This power approach requires an external, high-efficiency, low I_Q buck converter to supply the VCORE.

LDO1, with the configurable clamping load switch option, supplies VDDA33 and VDDSHV_A,B,C,F (3.3V at 600mA). LDO2, with a configurable clamping load switch option, can supply transceivers and peripherals. LDO3, with configurable clamping load switch option and 1% accuracy, serves external sensors and peripherals. LDO4, with configurable clamping load switch option and 1% accuracy, supplies VDDSHV_D,E and VDDS18 (3.3V at 200mA).

MCU error signal monitor and watchdog outputs supply the Safety Management Unit (SMU) and the Error Output pin. Watchdog and SPI outputs connect to the SPI pin. Diagnostics output GPO connects to ADC pins. Reset output connects to the RESET pin.

The device provides two wake-up timer pins (WAKE1 and WAKE2) for external use. The device includes two external voltage monitors (MON1 and MON2) for voltage monitoring of external system components. The device offers two safing outputs (Safing1 and Safing2) for external use in system.