EV5424-R-00A datasheet(22/44 Pages) MPS

22 / 44 page

MP5424

– 5V POWER MANAGEMENT IC WITH I2C AND MTP

MP5424 Rev. 1.0

MonolithicPower.com

12/6/2021

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

Shutdown

The shutdown sequence begins once PWRON

pulled

low

for

longer

than

PWRON_DEBOUNCE_TIMER while the PMIC

is on. The MP5424 turns off all of the bucks,

LDOs, and load switch. The shutdown sequence

can be configured via the MTP e-fuse.

If the PWRON pin remains low after the

shutdown sequence is complete, then the

MP5424 remains in the shutdown state. If the

PWRON pin is pulled high after the shutdown

sequence

complete,

then

the

MP5424

continues the shutdown sequence.

OUT2

OUT4

RSTO

PWRON

Debounce Timer

Figure 9: PWRON_MODE = 1 (Press PWRON to Shutdown)

PWRON_MODE = 0 (Level Trigger)

The PMIC enters the start-up sequence once

VAVIN exceeds its UVLO threshold and PWRON

is pulled high.

If PWRON is pulled low while the MP5424 is on,

then

the

device

executes

the

shutdown

sequence. If PWRON is pulled high while the

MP5424 is off, then the MP5424 executes a

start-up

sequence.

During

start-up

shutdown sequence, the PWRON pin function is

blanked until the sequence is complete. For

example, if PWRON is high during a shutdown

sequence and then the PMIC finishes the

shutdown sequence, the PMIC executes the

start-up sequence (see Figure 10).

OUT2

OUT4

RSTO

PWRON

(PWRON_MODE = 0)

PWRON Is Blanked during the

Start-Up/Shutdown Sequence

Figure 10: PWRON Enable and Disable Function

EN1 Functions

EN1 is a multi-function pin. The LSWO pin and

LDO 2 can be selected as EN1

’s input according

to the EN1_SELECT bit of CLT3 register.

EN_EN1_Pin

bit

can

enable/

disable

EN1

functions. EN1_INV defines EN1 as active high or

active low.

The EN1 pin can be used to control the power rails’

start-up and shutdown sequences. This is useful

for non-I2C interface applications.

Figure 11 on page 23 shows the EN1 function. If

EN1_INV is high and EN1 controls buck 2 and

buck 3, then buck 2 and buck 3 turn off

sequentially when EN1 is pulled low. If EN1 is

pulled high, buck 2 and buck 3 turn on sequentially.

PWRON has a higher priority than EN1, so if

PWRON is pulled low, then all of the power rails

enter the shutdown sequence. The buck, LDO,

and load switch enable/disable functions are

controlled via the PWRON and EN1 pins.

EV5424-R-00A 数据表(PDF) 22 Page - Monolithic Power Systems

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