MP4432

36V, 2.2A, Low Quiescent Current,

Synchronous, Step-Down Converter

MP4432 Rev. 1.01

www.MonolithicPower.com

1

1/12/2018

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© 2018 MPS. All Rights Reserved.

DESCRIPTION

The MP4432 is a synchronous, step-down,

switching

regulator

with

programmable

frequency (350kHz to 2.5MHz) and integrated,

internal,

high-side

and

low-side

power

MOSFETs. The MP4432 provides up to 2.2A 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.

The MP4432 is ideal for

battery-powered

applications due to its extremely low quiescent

current.

The MP4432 employs advanced asynchronous

mode (AAM) to 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, external

clock

synchronization,

enable

control,

and

power good indication. High-duty cycle and low

dropout mode are provided for automotive cold-

crank.

Over-current

protection

(OCP)

with

valley-

current detection is employed to prevent the

inductor current from running away. Hiccup

mode reduces the average current greatly in

short-circuit

condition.

Thermal

shutdown

provides reliable and fault-tolerant operation.

The

MP4432

is

available

in

a

QFN-16

(3mmx4mm) package.

FEATURES

 Wide 3.3V to 36V Operating Input Range

 2.2A Continuous Output Current

 1μA Low Shutdown Mode Current

 10μA Sleep Mode Quiescent Current

 Internal 90mΩ High-Side and 40mΩ 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 Indicator

 Programmable Soft-Start 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

MP4432

VIN

EN

VIN

FREQ

FB

BST

VOUT

SW

GND

PHASE

VCC

BIAS

PG

SS

3.3 to 36V

SYNC