MP4322
36V, 2A, Configurable-Frequency, Low-IQ,
Synchronous Step-Down Converter with
42V Load Dump Tolerance
DESCRIPTION
FEATURES (continued)
The MP4322 is
a
configurable-frequency
•
Increases Battery Life:
(350kHz to 2.5MHz), synchronous, step-down
switching converter with integrated internal high-
side and low-side power MOSFETs (HS-FET
and LS-FET, respectively). The device provides
o 1μA Shutdown Supply Current (ISD)
o 20μA Sleep Mode Quiescent Current
(IQ)
o Advanced Asynchronous Modulation
(AAM) Mode Increases Efficiency under
Light Loads
up to 2A of highly efficient output current (IOUT
with peak current mode control.
)
•
•
High Performance for Improved Thermals:
o Integrated 70mΩ/50mΩ MOSFETs
The wide 3.3V to 36V input voltage (VIN) range
and 42V load dump tolerance accommodates a
variety of step-down applications in automotive
input environments. A 1μA shutdown current
(ISD) allows the device to be used in battery-
powered applications.
o 65ns Minimum On Time (tON_MIN
)
o 50ns Minimum Off Time (tOFF_MIN
)
Optimized for EMC/EMI:
o Frequency Spread Spectrum (FSS)
Modulation
High power conversion efficiency across the
entire load range is achieved by scaling down
the switching frequency (fSW) under light-load
conditions to reduce switching and gate driver
losses.
o Symmetric VIN Pinout
o CISPR25 Class 5 Compliant
o 350kHz to 2.5MHz Configurable
Switching Frequency (fSW)
o MeshConnect™ Flip-Chip Package
•
Additional Features:
An open drain power good (PG) signal indicates
whether the output is within 94.5% to 105.5% of
its nominal voltage.
o Power Good (PG) Output
o Low-Dropout (LDO) Mode
o Fixed Output Options (1): 1V, 1.8V, 2.5V,
3.0V, 3.3V, 3.8V, 5V
o Hiccup Over-Current Protection (OCP)
o Available in a QFN-12 (2mmx3mm)
Package
Frequency foldback prevents inductor current
(IL) runaway during start-up. Thermal shutdown
provides reliable, fault-tolerant operation.
High duty cycle and low-dropout (LDO) mode are
provided for automotive cold-crank conditions.
o Available in a Wettable Flank Package
The MP4322 is available in a QFN-12
(2mmx3mm) package with wettable flanks.
APPLICATIONS
•
•
•
•
USB Chargers
Aftermarket Automotive Applications
Battery-Powered Systems
General Consumer Applications
FEATURES
•
Designed for Aftermarket Automotive
Applications:
Note:
o 42V Load Dump Tolerance
o Supports 3.1V for Cold Crank
Conditions
1) See the Ordering Information section on page 3 for details
regarding the fixed-output versions. Additional output voltages
may be available. Contact MPS for details.
o Up to 2A of Continuous Output Current
o Continuous Operation Up to 36V
o -40°C to +125°C Junction Temperature
(TJ) Range
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.
MP4322 Rev. 1.0
4/6/2023
MonolithicPower.com
1
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2023 MPS. All Rights Reserved.
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