MP4431
36V, 1A, Low Quiescent Current,
Synchronous, Step-Down Converter
DESCRIPTION
FEATURES
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.
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
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.
Available in
Package
a
QFN-16 (3mmx4mm)
APPLICATIONS
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.
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.
The MP4431 is available in a QFN-16
(3mmx4mm) package.
TYPICAL APPLICATION
VIN
3.3 to 36V
VIN
BST
EN
SYNC
VOUT
SW
MP4431
PHASE
GND
FREQ
FB
PG
SS
VCC
BIAS
MP4431 Rev. 1.01
1/12/2018
www.MonolithicPower.com
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