EN

Buck 1

0 1 2 3

Buck 2

Timing Code

Timing Code

START UP sequence

SHUT DOWN sequence

is in reverse order of START UP sequence

EN

Buck 1

0

1

2

3

Buck 2

LDO1

LDO1

LDO3

LDO3

STANDBY

START UP

SHUT DOWN

STANDBY

IDLE

Note 3

Note 4

LDO4

LDO4

LDO5

LDO5

LILO 2

LILO 2

LILO 1

LILO 1

4 5 6

6 5 4

LDO2

LDO2

Note 5

Note 5

LP8725

www.ti.com

SNVS618G – DECEMBER 2009 – REVISED MAY 2013

All timing is typical.

Note 1 STARTUP and SHUTDOWN sequences are defined by registers. Sequences given here are valid if there the

registers are not rewritten via Serial Interface.

Note 2 The timing showed here define time points when LDOs and BUCK are enabled/disabled. Enabling /disabling

process duration depends on voltages and loading conditions. Buck startup duration is typically 170 µs. LDO startup

duration is typically 35 µs. For details please see LDOs and BUCK Electrical Specifications.

Note 3 BUCK1 is disabled. If it is enabled via Serial Interface and the startup sequence is not changed, then it will be

disabled, with no delay, from falling edge of EN-pin.

Note 4 At this time point registers are reset to POR default values.

Note 5 BUCK2 and LDO3 are enabled by B2_EN and LDO3_EN respectively (or via serial interface). If these inputs

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