LP8725TLE-ASLASHNOPB datasheet(12/46 Pages) TI1

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Buck 1

0 1 2 3

Buck 2

tBON

Timing Code

START UP sequence

SHUT DOWN sequence

is in reverse order of START UP sequence

Buck 1

Buck 2

LDO1

LDO3

STANDBY

START UP

SHUT DOWN

STANDBY

IDLE

Note 4

LDO4

LDO5

LILO 2

LILO 1

4 5 6

6 5 4

LDO2

LP8725

SNVS618G – DECEMBER 2009 – REVISED MAY 2013

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Figure 8. LP8725-A Startup and Shutdown Sequence if CONFIG=GND, DEFSEL=GND Note 1, Note 2

All timing is typical.

tBON 75 µs - Reference and bias turn ON.

tS Programmable time steps. (Typically 64 µs/step.) Time step accuracy is defined by OSC frequency accuracy.

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

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