MP4431

36V, 1A, Low Quiescent Current,

Synchronous, Step-Down Converter

MP4431 Rev. 1.01

www.MonolithicPower.com

1

1/12/2018

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© 2018 MPS. All Rights Reserved.

DESCRIPTION

The MP4431 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 MP4431 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

MP4431

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

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

MP4431

VIN

EN

VIN

FREQ

FB

BST

VOUT

SW

GND

PHASE

VCC

BIAS

PG

SS

3.3 to 36V

SYNC