TM
MP2351
1.5A, 23V, 1.4MHz
Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP2351 is a monolithic step down switch
mode converter with a built in internal power
MOSFET. It achieves 1.5A continuous output
current over a wide input supply range with
excellent load and line regulation.
Current mode operation provides fast transient
response and eases loop stabilization.
Fault condition protection includes cycle-by-cycle
current limiting, short circuit frequency foldback
and thermal shutdown. In shutdown mode the
regulator draws 20µA of supply current.
The MP2351 requires a minimum number of
readily available standard external components.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1.5A Output Current
0.18Ω Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
Capacitors
Up to 93% Efficiency
20µA Shutdown Mode
Fixed 1.4MHz Frequency
Thermal Shutdown
Cycle-by-Cycle Over Current Protection
Wide 4.75V to 23V Operating Input Range
Output Adjustable from 1.23V to 16V
Programmable Under Voltage Lockout
Frequency Synchronization Input
Available in QFN (3mm x 3mm) and tiny
10-Pin MSOP Packages
Evaluation Board Available
Distributed Power Systems
Battery Charger
DSL Modems
Pre-Regulator for Linear Regulators
EVALUATION BOARD REFERENCE
Board Number
EV2351DQ-00A
Dimensions
2.3”X x 1.5”Y x 0.5”Z
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V - 23V
4
2
BS
SW
5
7
C5
10nF
IN
EN
Efficiency vs
Load Current
100
V
OUT
=5V
D1
B220A
EFFICIENCY (%)
OPEN
AUTOMATIC
STARTUP
OPEN
NOT USED
9
10
MP2351
SYNC
GND
6
FB
COMP
8
V
OUT
3.3V/1.5A
90
80
70
60
50
40
0
300 600 900 1200 1500
LOAD CURRENT (mA)
MP2351-EC01
V
OUT
=2.5V
V
OUT
=3.3V
C6
OPEN
C3
1nF
MP2351_TAC_S01
MP2351 Rev. 1.5
1/6/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
MPS [ MONOLITHIC POWER SYSTEMS ]
