EV5424-R-00A datasheet(18/44 Pages) MPS

18 / 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.

Power Control

State Machine Description

The state machine has a number of status

options, including no supply, shutdown, start-up

sequence,

start-up,

shutdown

sequence,

configure MTP, and shutdown event (see Figure

4 on page 17). These statuses are described

below.

No Supply

The PMIC’s input pin (AVIN) has a UVLO

detection circuit. If the input voltage (VAVIN) drops

below the under-voltage lockout (UVLO) rising

threshold, then

all of the PMIC’s functions are

disabled.

Shutdown

All of the power rails turn off, and the PMIC

enters the shutdown state once VAVIN drops

below

its

UVLO

falling

threshold.

the

shutdown state, the PMIC monitors the power-

on factors. Once a power-on factor is detected,

the device begins the start-up sequence.

Start-Up Sequence

The DC/DC converters, LDOs, and load switch

turn on sequentially according to the order

configured via the MTP e-fuse.

Start-Up

The DC/DC converters, LDOs and load switch

turn on, and t

he RSTO pin’s output goes high. In

the start-up state, the PMIC monitors the power-

off factors and configure MTP factors.

Shutdown Sequence

If the PMIC detects the shutdown factors during

a start-up state, then the PMIC enters the

shutdown sequence. RSTO is pulled low. Then

the DC/DC converters, LDOs, and load switch

turn off sequentially according to the order

configured via the MTP e-fuse.

MTP Configure

The buck converters, LDOs, and load switch turn

off in the shutdown sequence when entering

MTP mode. After MTP configuration is complete,

the PMIC reloads the MTP to the I2C registers

and monitors the power-on factors.

Shutdown Event

If the PMIC detects any of the following

conditions, then it enters a no supply or

shutdown state, regardless of the current state.

• If the input voltage (V

IN) drops below the

UVLO falling threshold, then the device

enters a no supply state.

• If thermal shutdown is triggered, then the

device enters a shutdown state.

Power-On Factor

The

PMIC

has

several

power-on

factors,

including PWR_ON, thermal recovery, and EN1.

These factors are described below.

PWRON_ON

If the PWRON pin is pulled to logic high

(PWRON_MODE = 0) or there is a falling edge

on the PWRON pin (PWRON_MODE = 1), then

the PMIC enters the start-up sequence. See the

PWRON Functions section on page 21 for more

details.

Thermal Recovery

If the die temperature exceeds the thermal

shutdown threshold, then the PMIC enters the

shutdown state. Once the die temperature drops

below the threshold, the PMIC enters the start-

up sequence.

EN1

If the EN1 function is enabled, and EN1 is pulled

high

(EN1_INV defines EN1’s active high) or

EN1 is pulled

low (EN1_INV defines EN1’s

active low), then the power rails controlled by

EN1 enter the start-up sequence. See the EN1

Functions section on page 22 for more details.

Start-Up Sequence

There are 16 selectable time slots for the start-

up sequence. All of the DC/DC converters, LDOs,

and load switch can be configured between 0

and 15 time slots by the MTP e-fuse. The delay

time between each time slot can be adjusted via

the MTP TIME_SLOT bits. The time does not

change with the switching frequency (fSW).

RSTO goes high with the RSTO_DELAY time

once the start-up sequence is complete. The

DC/DC converter, LDOs, and load switch start-

up sequences are set by POWER_ON_SLOT_

NO and PWR_ON_TIME_SLOT_MODE. See

the MTP E-Fuse Description on page 28 for

more details.

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