ZHCSI93D May 2018 – October 2022 TPS65987D
PRODUCTION DATA
The TPS65987D power management block receives power and generates voltages to provide power to the TPS65987D internal circuitry. These generated power rails are LDO_3V3 and LDO_1V8. LDO_3V3 may also be used as a low power output for external flash memory. The power supply path is shown in Figure 8-9.
The TPS65987D is powered from either VIN_3V3, VBUS1, or VBUS2. The normal power supply input is VIN3V3. In this mode, current flows from VIN_3V3 to LDO3V3 to power the core 3.3-V circuitry and I/Os. A second LDO steps the voltage down from LDO_3V3 to LDO_1V8 to power the 1.8-V core digital circuitry. When VIn_3V3 power is unavailable and power is available on VBUS1 or VBUS2 , the TPS65987D is powered from VBUS. In this mode, the voltage on VBUS1 or VBUS 2 is stepped down through an LDO to LDO_3V3.