MP2309 Datasheet, PDF (1/10 Pages) Monolithic Power Systems – 1A, 23V, 340KHz Synchronous Rectified Step-Down Converter

TM
The Future of Analog IC Technology ^TM
MP2309
1A, 23V, 340KHz Synchronous Rectified
Step-Down Converter
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.
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 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
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
C5
10nF
2
IN
7 _EN
1
BS ₃
SW
MP2309
8 _SS
FB ⁵
GND
COMP
4
6
C3
3.3nF
OUTPUT
3.3V
1A
1%
MP2309-TAC01
Efficiency vs
Load Current
100
90
80
V_IN = 5V
70
V_IN = 12V
60
V_IN = 23V
50
40
30
20
0
0.25 0.5 0.75 1.0
LOAD CURRENT (A)
MP2309-EC01
MP2309 Rev. 1.4
www.MonolithicPower.com
1
3/13/2006
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