LP8725 datasheet(7/46 Pages) TI1

7 / 46 page

STANDBY

IDLE

SLEEP

OFF

UVLO=1

(POR)

EN=1

STARTUP SEQ

EN=0

SHUTDOWN SEQ

SLEEP_MODE=0

SLEEP_MODE=1

IDLE

PS_HOLD=1

SLEEP

OFF

UVLO=1

AND

PWR_ON=1

(POR AND

STARTUP

SEQ)

PS_HOLD=0

(SHUTDOWN SEQ)

SLEEP_MODE=0

SLEEP_MODE=1

LP8725

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SNVS618G – DECEMBER 2009 – REVISED MAY 2013

Figure 1. SUB-PMU Mode, CONFIG = 0

Figure 2. PMU Mode, CONFIG = 1

Additional Functions

DVS: Dynamic Voltage Scaling allows using 2 set voltages for BUCKs. This is controlled via Serial Interface.

BUCK1 can also be controlled by the external DVS pin.

FAULT DETECTION If BUCK1/BUCK2 and LDO1 are not masked then if one of the outputs is pulled down - e.g.,

short circuit, then RESET_N is asserted (low)..

Table 2. Default Start-Up Enable Sequence(1)

Part No.

DEFSEL

Start-Up Sequence

Shut Down Sequence

LP8725

VIN1 (setup 1)

BUCK1 then BUCK2 and LILO2 then LDO1, LDO2, LDO4

In reverse order of start-up

and LDO5 then LDO3 and LILO1

sequence.

LP8725

GND (setup 2)

BUCK1 and LILO2 then BUCK2, LDO1, LDO2, LDO5 and

In reverse order of start-up

LILO1 then LDO3 and LDO4.

sequence.

LP8725-A

VIN1 (setup 1)

LDO1, LDO2, LDO5 and LILO1 then LDO4 and LILO2

In reverse order of start-up

sequence.

LP8725-A

GND (setup 2)

BUCK1 and BUCK2 then LDO2 and LDO3 then LDO1,

In reverse order of start-up

LDO4 and LDO5 then LILO1 and LILO2

sequence.

LP8725-B

VIN1 or GND

BUCK1 then BUCK2 then LDO1 then LILO2

In reverse order of start-up

sequence.

LP8725-C

VIN1 or GND

BUCK1 then BUCK2 and LDO5 then LDO1 and LDO2 and

In reverse order of start-up

LILO 1and LILO 2 then LDO3 and LDO4

sequence.

LP8725-D

VIN1 or GND

BUCK1 then BUCK2, LDO3, LILO1 and LILO2

In reverse order of start-up

sequence.

(1)

These are dependent on whether DEFSEL is connected to VIN1 or GND when PWR_ON/EN=1.

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