AN2937 Datasheet, PDF (19/41 Pages) STMicroelectronics – Power system demonstration kit based on the PM6686 dual

AN2937
Jumper settings
9.6
LDO regulation (LDOREFIN)
Table 8. Jumper S6 LDOREFIN (connect LDOREFIN pin to S6)
Position
LDO regulation
GND
The LDO regulates 5 V.
VREF2
The LDO regulates a voltage equal to two times the voltage at LDOREFIN input.
VCC
The LDO regulates 3.3 V.
9.7
External bypass connections for the linear regulator (BYP)
Table 9. Jumper S7 BYP (connect LDO_SW pin to S7)
Position
External bypass connections for the linear regulator
GND
The internal linear regulator LDO is always on. It can provide an output peak current
of 100 mA.
OUT1.
If LDO regulates 5 V and BYP goes higher than 4.74 V, an internal P-channel
MOSFET switch connects the BYP pin to the LDO pin, shutting down the LDO
internal linear regulator. It can provide an output peak current of 200 mA.
OUT2
If LDO regulates 3.3 V and BYP goes higher than 3.17 V, an internal P-channel
MOSFET switch connects the BYP pin to the LDO pin, shutting down the LDO
internal linear regulator. It can provide an output peak current of 100 mA.
Doc ID 15418 Rev 1
19/41