MP2355
3A, 23V, 380KHz
Step-Down Converter
MP2355 Rev. 1.4 www.MonolithicPower.com 1
1/6/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP2355 is a step-down regulator with a
built in internal Power MOSFET. It achieves 3A
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 and thermal shutdown. Adjustable
soft-start reduces the stress on the input source
at turn-on. In shutdown mode the regulator draws
20µA of supply current.
The MP2355 uses a minimum number of
readily available external components to
complete a 3A step-down DC to DC converter
solution.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV2355DN-00A 2.0”X x 1.3”Y x 0.5”Z
FEATURES
• Programmable Soft-Start
• 100mΩ Internal Power MOSFET Switch
• Stable with Low ESR Output Ceramic
Capacitors
• Up to 95% Efficiency
• 20µA Shutdown Mode
• 3A Output Current
• Wide 4.75V to 23V Operating Input Range
• Fixed 380KHz Frequency
• Thermal Shutdown
• Cycle-by-Cycle Over Current Protection
• Under Voltage Lockout
APPLICATIONS
• Distributed Power Systems
• Battery Chargers
• Pre-Regulator for Linear Regulators
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP2355
LX
VIN BST
FB
75
32
4
6
1
8
SS
COMPGND
RUN
OUTPUT
3.3V / 3A
INPUT
4.75V to 23V
OPEN
AUTOMATIC
STARTUP
MP2355_TAC_S01
10nF
4.7nF
10nF
D1
B330A
EFFICIENCY (%)
95
90
85
80
75
70
65
60
LOAD CURRENT (mA)
MP2355_EC01
Efficiency vs
Load Current
0 15001000500 2000 350030002500
V
OUT
=2.5V
V
OUT
=3.3V
V
OUT
=5.0V
