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MP2309
1A, 23V, 340KHz Synchronous Rectified
Step-Down Converter
MP2309 Rev. 1.4
3/13/2006
www.MonolithicPower.com
1
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP2309 is a monolithic synchronous buck
regulator.
The
device
MOSFETS that provide 1A continuous load
current over a wide operating input voltage of
4.75V to 23V. Current mode control provides
fast transient response and cycle-by-cycle
current limit.
integrates
140m
An adjustable soft-start prevents inrush current
at turn-on. Shutdown mode drops the supply
current 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
EV2309DS-00A
Dimensions
2.0”X x 1.5”Y x 0.5”Z
FEATURES
1A Output Current
Wide 4.75V to 23V Operating Input Range
Integrated 140m
Power MOSFET Switches
Output Adjustable from 0.923V to 20V
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
APPLICATIONS
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
OUTPUT
3.3V
1A
C3
3.3nF
C5
10nF
1%
MP2309
BS
2
1
3
5
6
4
8
7
IN
FB
SW
SS
GND
COMP
EN
MP2309-TAC01
100
90
80
70
60
50
40
30
20
E
0
0.5
1.0
0.75
0.25
LOAD CURRENT (A)
MP2309-EC01
Efficiency vs
Load Current
V
IN
= 5V
V
IN
= 12V
V
IN
= 23V
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