The Future of Analog IC Technology
DESCRIPTION
The MP2451 is a high frequency (2MHz) step-
down switching regulator with integrated
internal high-side high voltage power MOSFET.
It provides single 0.6A (or less) highly efficient
output with current mode control for fast loop
response.
The wide 3.3V to 36V input range
accommodates a variety of step-down
applications in automotive input environment. A
3μA shutdown mode quiescent current allows
use in battery-powered applications.
High power conversion efficiency over a wide
load range is achieved by scaling down the
switching frequency at light load condition to
reduce the switching and gate driving losses.
Frequency fold-back helps prevent inductor
current runaway during start-up. Thermal
shutdown provides reliable, fault-tolerant
operation.
The MP2451 is available in the cost-effective
SOT23-6 and TSOT23-6 packages.
MP2451
36V, 2MHz, 0.6A
Step-Down Converter
FEATURES
130μA Operating Quiescent Current
Wide 3.3V to 36V Operating Input Range
500mΩ Internal Power MOSFET
2MHz fixed Switching Frequency
Internally compensated
Stable with Ceramic Output Capacitors
Internal Soft-Start
Precision Current Limit Without Current
Sensing Resistor
> 90% Efficiency
Output Adjustable from +0.8V to 0.8xVIN
3μA Low Shutdown Supply Current
SOT23-6 and TSOT23-6 Packages
APPLICATIONS
High Voltage Power Conversion
Automotive Systems
Industrial Power Systems
Distributed Power Systems
Battery Powered Systems
All MPS parts are lead-free, halogen free, and adhere to the RoHS directive. For
MPS green status, please visit MPS website under Quality Assurance. “MPS”
and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
C3
33pF
1 BST
SW 6
MP2451
GND
VIN 5
C4
100nF
L1
D1
VIN
C1
3 FB
EN 4
Control
VOUT
5V/0.6A
Efficiency
VOUT=5V
95
VIN=8V
90
85
VIN=12V
80
VIN=24V
75
70
VIN=36V
65
60
55
50
0
0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT(A)
MP2451 Rev. 1.34
www.MonolithicPower.com
1
8/6/2019
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2019 MPS. All Rights Reserved.
