MP4571

High-Efficiency, 1A, 60V, Fully Integrated

Synchronous Buck Converter

MP4571 Rev. 1.1

www.MonolithicPower.com

1

2/22/2023

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© 2023 MPS. All Rights Reserved.

DESCRIPTION

The

MP4571

is

a

fully

integrated,

fixed-

frequency, synchronous step-down converter. It

can achieve up to 1A of continuous output

current with peak current control for excellent

transient response.

The wide 4.5V to 60V input voltage range

accommodates

a

variety

of

step-down

applications in an automotive input environment.

A 2

μA shutdown mode quiescent current makes

it ideal for battery-powered applications.

The MP4571 integrates internal high-side and

low-side power MOSFETs for high efficiency

without an external Schottky diode, and is

available in a 12-pin QFN package.

The MP4571 employs advanced asynchronous

modulation (AAM), which achieves high efficiency

during light load by scaling down the frequency to

reduce the switching and gate driver losses.

The MP4571 offers standard features including

built-in soft start, enable control, and a power

good indicator. High duty cycle and low-dropout

mode are provided for automotive cold crank

conditions. In addition, the chip provides over-

current protection with valley current detection,

which helps prevent current runaway. It also has

hiccup short-circuit protection (SCP), input under-

voltage

lockout

(UVLO),

and

auto-recovery

thermal protection.

With internal compensation, the MP4571 offers

a very compact solution with a minimum number

of

readily

available,

standard

external

components.

It

is

available

in

a

QFN-12

(2.5mmx3mm) package.

FEATURES

• Wide 4.5V to 60V Operating Input Range

• 1A Continuous Output Current

• High-Efficiency Synchronous Mode Control

• 250mΩ/45mΩ Internal Power MOSFETs

• Configurable Frequency Up to 2.2MHz

• 180° Out-of-Phase SYNCO Clock

• 40μA Quiescent Current

• Low Shutdown Mode Current: 2μA

• FB Tolerance: 1% at Room Temp, 2% at

Full Temp

• Selectable AAM or Forced CCM Operation

at Light Load

• Internal 0.45ms Soft Start

• Remote EN Control

• Power Good (PG) Indicator

• Low-Dropout Mode

• Over-Current Protection (OCP)

• Short-Circuit Protection with Hiccup Mode

• V

IN Under-Voltage Lockout (UVLO)

• Thermal Shutdown

• Available in a QFN-12 (2.5mmx3mm)

Package

• Available in a Wettable Flank Package

APPLICATIONS

• Automotive Infotainment

• Automotive Lamps and LEDs

• Automotive Motor Control

• 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”, the MPS logo, and “Simple, Easy Solutions” are

trademarks of Monolithic Power Systems, Inc. or its subsidiaries.