Voltage	Where	What happens

 4.5 V	USB	USB voltage required for battery charging
	USB	Minimum USB voltage at device guaranteed by USB 2.0
 4.2 V	BAT	Battery float voltage (NoPower default and u-boot setting)
 3.6 V	USB	+/- 0.35V, USB adapter present (rising)
 3.5 V	USB	+/- 0.35V, USB adapter present (falling)
 3.4 V	BAT	u-boot wait_for_power threshold
 3.3 V	AUTO	AUTO (IO_3V3) voltage (Standby default and set by u-boot)
 3.3 V	LDO1	LDO1 (GSENSOR_3V3) voltage (set by u-boot)
 3.3 V	LDO2	LDO2 (CODEC_3V3) voltage (set by u-boot)
 3.3 V	HCLDO	HCLDO (SD_3V3) voltage (set by u-boot)
 3.1 V	SYS	Minimum SYS voltage, interrupt and timeout (set by u-boot)
 3.1 V	BAT	Battery threshold (NoPower default)
 3.0 V	SYS	Minimum SYS voltage, interrupt and timeout (NoPower default)
 3.0 V	BUB	Backup battery charge voltage limit (set by u-boot)
 3.0 V	LDO5	LDO5 (RF_3V) voltage (set by u-boot)
 3.0 V	LDO6	LDO6 (LCM_3V) voltage (Standby default and set by u-boot)
 2.85V	BAT	Battery conditioning (NoPower default)
 2.8 V	BAT	Battery threshold (set by u-boot)
 2.8 V	LDO1	LDO1 (GSENSOR_3V3) voltage (Standby default)
 2.8 V	LDO4	LDO4 (BT_3V2) voltage (Standby default)
 2.7 V	BAT	Battery conditioning (set by u-boot)
 2.5 V	SYS	SYS voltage for immediate shutdown into Save mode
 2.5 V	BUB	Backup battery charge voltage limit (NoPower default)
 2.4 V	BAT	GTA02 battery cuts off
 2.2 V	BAT	GTA01 battery cuts off
 2.0 V	SYS	+/- 0.3V, SYS voltage to enter Save/NoPower
 1.8 V	DOWN2	DOWN2 (IO_1V8) voltage (Standby default and set by u-boot)
 1.3 V	BUB	+/- 0.3V, Backup battery present threshold
 1.3 V	DOWN1	DOWN1 (CORE_1V3) voltage (set by u-boot)
 1.2 V	DOWN1	DOWN1 (CORE_1V3) voltage (Standby default)
 0.0 V	BAT	No battery or battery in cut-off

Notes:
- LDO2, LDO3, LDO5, and HCLDO  are turned off in Standby.
- we don't use LDO3.
- LDO4 is turned off by u-boot.