I want to use the two following ICs connected to the PocketBeagle and supplied by (SYS_VDD1_3P3V) (P1.14 or P2.23 that are the output of the LDO TL5209) because it has a maximum output current of 500mA.
- ADXL357 Accelerometer with supply voltage of 2.25V to 3.6V and typical current of 200uA in measurement mode
- ESP-WROOM-02 wifi-module with a supply voltage of 2.7V to 3.6V and a minimum current delivered by power supply of 500mA required and average operating current of 80mA.
The Pocketbeagle will be supplied by a 3.7V Lipo battery. The output ranges from 4.2V when completely charged to 3.7V.
The problem is that I read in the “OSD335x-SM Power Application note” the following and in OSD335x-SM Family datasheet:
" Due to the dropout behavior of the LDO TL5209, its output voltage rail SYS_VDD1_3P3V should not be used when the OSD335x is being powered through VIN_BAT. Please refer to the TL5209 datasheet for details."
It’s true that the mentioned LDO has a voltage dropout of 500mV at full load of 500mA. But, even with full load, the voltage on the output delivered by the LDO should be at least (3.7V - 500mV = 3.2V) which is inside the range for the two ICs mentioned above.
Will that then work or am I overlooking something here?