MPF7100BVBA2ES datasheet(27/125 Pages) NXP

27 / 125 page

NXP Semiconductors

PF7100

7-channel power management integrated circuit for high performance applications

PF7100

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Product data sheet

Rev. 4 — 9 March 2021

27 / 125

aaa-028054

System On

End of

PWRUP

End of

PWRDN

Power down Seq.

Run to Off mode

Power up Seq.

Off to Run mode

INTB

LDO2

SW2

SW3

LDO1

SW1

RESETBMCU

Start of

PWRDN

Figure 9. Power up/down sequence between OFF and system-on states

When transitioning from standby mode to run mode, the power up sequencer is activated

only if any of the external regulators is re-enabled during this transition. If none of the

regulators toggle from Off to On and only voltage changes are being performed when

entering or exiting standby mode, the changes for the voltage regulators are made

simultaneously rather than going through the power up sequencer.

Figure 10 shows an example of the power up/down sequence when transitioning

between run and standby modes.

aaa-028055

PWRUP_l

PWRDN_l

Run

Mode

STBY

Mode

PWRDN Sequence

from Run to STBY

PWRUP Sequence

from STBY to Run

INTB

RESETBMCU

LDO2

SW3

SW2

SW1

LDO1

Figure 10. Power up/down sequence between run and standby

The PWRUP_I interrupt is set while transitioning from standby to run, even if the

sequencer is not used. This is used to indicate that the transition is complete and device

is ready to perform proper operation.

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