MPQ9840

36V, 3.5A, Low IQ,

Synchronous Step-Down Converter

AEC-Q100 Qualified

MPQ9840 Rev. 1.02

www.MonolithicPower.com

1

7/1/2020

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© 2020 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The

MPQ9840

is

a

high-frequency,

synchronous, rectified, step-down, switch-mode

converter with built-in power MOSFETs. It

offers a very compact solution that achieves

3.5A of continuous output current with excellent

load and line regulation over a wide 3.3V to 36V

input supply range. The switching frequency

can be programmed or synchronized to an

external clock in the range of 350kHz to

2.5MHz. The synchronous operation and ultra-

low 14μA sleep mode quiescent current provide

high efficiency over the output current load

range, allowing the MPQ9840 to be used in a

variety of step-down applications in automotive

input

environments

and

battery-powered

applications.

Peak-current-mode operation provides fast

transient response and eases loop stabilization.

The excellent low dropout performance allows

the MPQ9840 to be used in high duty cycle

applications.

Full protection features include over-current

protection (OCP), short-circuit protection (SCP),

and thermal shutdown. An open-drain power

good (PG) signal indicates when the output is

within 10% of its nominal voltage.

The MPQ9840 is available in a space-saving

QFN-16 (3mmx4mm) package.

FEATURES

 2μA Low Shutdown Supply Current

 14μA No-Load Quiescent Current

 Internal 125mΩ High-Side and 55mΩ Low-

Side MOSFET

 350kHz to 2.5MHz Programmable Switching

Frequency

 Power Good (PG) Output

 External Soft Start (SS)

 80ns Minimum On Time

 Selectable Forced CCM and AAM

 Hiccup Over-Current Protection (OCP)

 AEC-Q100 Grade-1

 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

40

50

60

70

80

90

100

10

100

1000

10000

Output Adjustable Version

Output Fixed Version