SBVU080 September 2023
EN is a 3-pin header used to enable or disable the TPS7B84-Q1, which in turn enables the populated tracker LDO.
The center pin of the 3-pin header is tied to the TPS7B84-Q1 EN input. When the 2-pin shunt is placed across the right two pins of the header, VIN is shorted to EN and the TPS7B84-Q1 is enabled. When the 2-pin shunt is placed across the left two pins of the header, GND is shorted to EN and the TPS7B84-Q1 is disabled.
If the TPS7B84-Q1 is not to be used to supply the ADJ/EN signal for the populated tracker, remove jumper J13 and use TP1 to drive ADJ/EN directly, or a combination of J5, R2, R5, C11 to configure ADJ/EN to be a function of the input voltage.