MPQ7920 datasheet(21/44 Pages) MPS

21 / 44 page

MPQ7920

– 5V POWER MANAGEMENT IC WITH I2C AND MTP, AEC-Q100

MPQ7920 Rev. 1.0

www.MonolithicPower.com

7/13/2020

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

For the four 4-channel buck outputs, the soft-

start times are MTP-adjustable. For the LDO2

through LDO5 outputs, the soft-start times are

internally fixed at 50µs. For LDORTC, the soft-

start slew rate is consistent at 25mV/µs.

Output Discharge

In order to discharge the output capacitor during

the power-off sequence, there is a passive

discharge path from the DC/DC

converters’ and

LDOs’ output to ground. The discharge path is

turned on when its corresponding channel is

disabled. The t

ypical discharge resistance is 7Ω.

The discharge function can be enabled or

disabled through the I2C interface.

Over-Voltage Protection (OVP)

The MPQ7920 monitors the feedback voltage to

detect an over-voltage condition. When the

feedback voltage exceeds 120% of the target

voltage, the controller turns off both the high-side

MOSFET (HS-FET) and low-side MOSFET (LS-

FET), and the discharge path is turned on. The

part exits this regulation period once the

feedback voltage falls below 110% of the

reference voltage.

Over-Current Protection (OCP)

If the peak inductor current reaches its limit (set

via the I2C registers) when the HS-FET is on,

OCP is triggered. The LS-FET is forced on until

the inductor current drops to the valley current

limit; then the HS-FET turns on again. The part

does not exit OCP unless the inductor peak

current falls below the limit. If the OCP time lasts

for longer than 150µs (typical), the buck enters

hiccup mode.

System Control Signals

PWRON Functions

PWRON is an input pin to the IC that generates

a power-on or power-off event. This pin can be

configured to detect a level or a falling edge via

the MTP.

When

the

PWRON_MODE

bit

the

PWRON_DEBOUNCE_TIMER bit can set the

PWRON pin

’s debounce timer to filter out

mechanical switch short press noise.

When the PWRON_MODE bit = 0, PWRON

works as an enable pin. Apply a logic high

voltage to turn the PMIC on; apply a logic low

voltage to turn the PMIC off.

PWRON_MODE = 1 (Edge Trigger)

Power On

If AVIN is above the UVLO threshold and

PWRON is asserted low for

longer than

PWRON_DEBOUNCE_TIMER when the PMIC

is powered off, the power-on sequence begins.

The power-on sequence must complete, and

then the PWRON detection function is re-

enabled.

Power Off

PWRON

asserts

low

for

longer

than

PWRON_DEBOUNCE_TIMER when the device

is powered on, the power-off sequence begins.

The MPQ7920 turns off all regulators and LDOs

(except OUTRTC). The power-off sequence is

pre-programmed by the MTP e-fuse.

OUT1

OUT4

RSTO

PWRON

Debounce Timer

Remains in the power on-state

when PWRON stays low

Figure 7: PWRON_MODE = 1, Press PWRON to Power On

If the PWRON pin is still pulled low after the

power-off sequence completes, the MPQ7920

remains in its power off state. If the PWRON pin is

pulled

high

after

the

power-off

sequence

completes, the MPQ7920 continues the power-off

sequence.

MPQ7920 Datasheet(PDF) 21 Page - Monolithic Power Systems

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