MP4430
36V, 3.5A, Low Quiescent Current,
Synchronous, Step-Down Converter
DESCRIPTION
FEATURES
The MP4430 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 3.5A of highly efficient output current with
current mode control for fast loop response.
Wide 3.3V to 36V Operating Input Range
3.5A Continuous Output Current
1μA Low Shutdown Mode Current
10μA Sleep Mode Quiescent Current
Internal 90mΩ High-Side and 40mΩ Low-
Side MOSFETs
350kHz
Switching Frequency
to
2.5MHz
Programmable
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.
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 MP4430 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 MP4430 is available in a QFN-16
(3mmx4mm) package.
TYPICAL APPLICATION
VIN
3.3 to 36V
VIN
BST
EN
SYNC
VOUT
SW
MP4430
PHASE
GND
FREQ
FB
PG
SS
VCC
BIAS
MP4430 Rev. 1.01
1/12/2018
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2018 MPS. All Rights Reserved.
1