MP2303
3A, 28V, 340KHz Synchronous Rectified
Step-Down Converter
INITIAL RELEASE – SPECIFICATIONS SUBJECT TO CHANGE
MP2303 Rev. 0.91 www.MonolithicPower.com 1
3/10/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP2303 is a monolithic synchronous buck
regulator. The device integrates 120mΩ
MOSFETS that provide 3A continuous load
current over a wide operating input voltage of
4.75V to 28V. Current mode control provides
fast transient response and cycle-by-cycle
current limit.
An adjustable soft-start prevents inrush current
at turn-on. In shutdown mode, the supply
current drops to 1µA.
This device, available in an 8-pin SOIC
package, provides a very compact system
solution with minimal reliance on external
components.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV2303DN-00A 2.0”X x 1.5”Y x 0.5”Z
FEATURES
• 3A Output Current
• Wide 4.75V to 28V Operating Input Range
• Integrated 120mΩ Power MOSFET Switches
• Output Adjustable from 0.8V to 25V
• Up to 95% Efficiency
• Programmable Soft-Start
• Stable with Low ESR Ceramic Output Capacitors
• Fixed 340KHz Frequency
• Cycle-by-Cycle Over Current Protection
• Input Under Voltage Lockout
• Thermally Enhanced 8-Pin SOIC Package
APPLICATIONS
• Distributed Power Systems
• Pre-Regulator for Linear Regulators
• Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
4.75V-28V
VOUT
5V/3A
C5
10nF
C3
3.3nF
MP2303
BS SS
EN
COMP
FB
IN
SW
GND
3
4
8
7
6
5
1
2
MP2303_TAC01
C6
(optional)
100
90
80
70
60
50
EFFICIENCY (%)
0 0.5 1.0 1.5 2.0 2.5 3.0
LOAD CURRENT (A)
MP2303-EC01
Efficiency vs
Load Current
VIN = 12V
VIN = 24V
V
OUT = 5V