MPQ4431

36V, 1A, Low Quiescent Current,

Synchronous, Step-Down Converter

AEC-Q100 Qualified

MPQ4431 Rev. 1.0

www.MonolithicPower.com

1

3/21/2017

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© 2017 MPS. All Rights Reserved.

DESCRIPTION

The MPQ4431 is a frequency-programmable

(350kHz to 2.5MHz), synchronous, step-down

switching regulator with integrated, internal,

high-side and low-side power MOSFETs. It

provides up to 1A of highly efficient output

current with current mode control for fast loop

response.

The wide 3.3V to 36V input range accommodates

a variety of step-down applications in automotive

input environments and is ideal for battery-

powered applications due to its extremely low

quiescent current.

The

MPQ4431

employs

advanced

asynchronous

mode

(AAM),

which

helps

achieve high efficiency in light-load condition by

scaling down the switching frequency to reduce

switching and gate driving losses.

Standard features include

soft start (SS),

external clock synchronization, enable (EN)

control, and a power good (PG) indicator. High-

duty cycle and low dropout mode are provided

for automotive cold-crank condition.

Over-current

protection

(OCP)

with

valley-

current detection is employed to prevent the

inductor current from running away. Hiccup

mode reduces the average current in short-

circuit condition greatly. Thermal shutdown

provides reliable and fault-tolerant operation.

The MPQ4431 is available in a QFN-16

(3mmx4mm) package.

FEATURES

 Wide 3.3V to 36V Operating Input Range

 1A Continuous Output Current

 1μA Low Shutdown Mode Current

 10μA Sleep Mode Quiescent Current

 Internal 90mΩ High-Side and 80mΩ Low-

Side MOSFETs

 350kHz to 2.5MHz Programmable Switching

Frequency

 Fixed Output Options: 3.3V, 3.8V, 5V

 Synchronize to External Clock

 Selectable In-Phase or 180° Out-of-Phase

 Power Good (PG) Indicator

 Programmable Soft-Start (SS) Time

 80ns Minimum On Time

 Selectable Forced CCM or AAM

 Low Dropout Mode

 Over-Current Protection (OCP) with Valley-

Current Detection and Hiccup

 Available in a QFN-16 (3mmx4mm)

Package

 Available with Wettable Flank

 AEC-Q100 Grade-1

APPLICATIONS

 Automotive Systems

 Industrial Power Systems

All MPS parts are lead-free, halogen-free, and adhere to the RoHS

directive. For MPS green status, please visit the MPS website under

Quality Assurance.

“MPS” and “The Future of Analog IC Technology” are

registered trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MPQ4431

VIN

EN

VIN

FREQ

FB

BST

VOUT

SW

GND

PHASE

VCC

BIAS

PG

SS

3.3 to 36V

SYNC