MP2305
2A, 23V Synchronous Rectified
Step-Down Converter
MP2305 Rev. 1.7 www.MonolithicPower.com 1
4/17/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP2305 is a monolithic synchronous buck
regulator. The device integrates 130m
MOSFETS that provide 2A 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 Dimensions
EV2305DS-00A 2.0”X x 1.5”Y x 0.5”Z
FEATURES
• 2A Output Current
• Wide 4.75V to 23V Operating Input Range
• Integrated 130m Power MOSFET Switches
• Output Adjustable from 0.923V to 20V
• Up to 93% 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
2A
C3
3.3nF
C5
10nF
MP2305
BSIN
FB
SW
SS
GND COMP
EN
12
3
5
64
8
7
MP2305-TAC01
100
95
90
85
80
75
70
65
60
55
50
EFFICIENCY (%)
0 1.0 2.0 2.51.50.5
LOAD CURRENT (A)
MP2305-EC01
Efficiency vs
Load Current
V
OUT
= 3.3V
V
OUT
= 2.5V
