TM
MP2355
3A, 23V, 380KHz
Step-Down Converter
The Future of Analog IC Technology
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
20碌A(chǔ) 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.
FEATURES
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Programmable Soft-Start
100m鈩?Internal Power MOSFET Switch
Stable with Low ESR Output Ceramic
Capacitors
Up to 95% Efficiency
20碌A(chǔ) 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
Distributed Power Systems
Battery Chargers
Pre-Regulator for Linear Regulators
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number
EV2355DN-00A
Dimensions
2.0鈥漍 x 1.3鈥漎 x 0.5鈥漐
鈥淢PS鈥?and 鈥淭he Future of Analog IC Technology鈥?are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
10nF
3
2
Efficiency vs
Load Current
95
90
V
OUT
=5.0V
EFFICIENCY (%)
OPEN
AUTOMATIC
STARTUP
8
1
VIN
RUN
BST
LX
4
6
MP2355
SS
GND
5
FB
COMP
7
D1
B330A
OUTPUT
3.3V / 3A
85
80
75
70
65
60
0
500 1000 1500 2000 2500 3000 3500
V
OUT
=3.3V
V
OUT
=2.5V
10nF
4.7nF
MP2355_TAC_S01
LOAD CURRENT (mA)
MP2355_EC01
MP2355 Rev. 1.4
1/6/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
漏 2006 MPS. All Rights Reserved.
1
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