TM
MP2309
1A, 23V, 340KHz Synchronous Rectified
Step-Down Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP2309 is a monolithic synchronous buck
regulator. The device integrates 140mΩ
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.
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.
FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
1A Output Current
Wide 4.75V to 23V Operating Input Range
Integrated 140mΩ 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
Distributed Power Systems
Networking Systems
FPGA, DSP, ASIC Power Supplies
Green Electronics/ Appliances
Notebook Computers
APPLICATIONS
EVALUATION BOARD REFERENCE
Board Number
EV2309DS-00A
Dimensions
2.0”X x 1.5”Y x 0.5”Z
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
C5
10nF
Efficiency vs
Load Current
100
90
2
7
IN
EN
1
BS
3
SW
MP2309
8
SS
GND
4
FB
COMP
6
5
OUTPUT
3.3V
1A
1%
EFFICIENCY (%)
80
70
60
50
40
30
20
0
V
IN
= 23V
V
IN
= 5V
V
IN
= 12V
C3
3.3nF
0.25
0.5
0.75
LOAD CURRENT (A)
1.0
MP2309-TAC01
MP2309-EC01
MP2309 Rev. 1.4
3/13/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
1
MPS [ MONOLITHIC POWER SYSTEMS ]
