MP2355 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – 3A, 23V, 380KHz Step-Down Converter

TM
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
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
EV2355DN-00A
Dimensions
2.0”X x 1.3”Y x 0.5”Z
MP2355
3A, 23V, 380KHz
Step-Down Converter
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
INPUT
4.75V to 23V
10nF
OPEN
AUTOMATIC
STARTUP
10nF
3
2
VIN
8
RUN
BST
4
LX
MP2355
1
SS
6
FB
GND
COMP
5
7
4.7nF
D1
B330A
OUTPUT
3.3V / 3A
MP2355_TAC_S01
Efficiency vs
Load Current
95
V_OUT=5.0V
90
85
80
V_OUT=3.3V
75
V_OUT=2.5V
70
65
60
0
500 1000 1500 2000 2500 3000 3500
LOAD CURRENT (mA)
MP2355_EC01
MP2355 Rev. 1.4
www.MonolithicPower.com
1
1/6/2006
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© 2006 MPS. All Rights Reserved.