MP2305S
2A, 23V Synchronous Rectified
Step-Down Converter
MP2305S Rev. 1.02 www.MonolithicPower.com 1
10/22/2013 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP2305S is a monolithic synchronous
buck regulator. The device integrates a 175m
high-side MOSFET and a 115m low-side
MOSFET 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 1A.
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
EV2305SDS-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 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 Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
INPUT
4.75V to 23V
OUTPUT
3.3V
2A
MP2305S
BSIN
FB
SW
SS
GND COMP
EN
12
3
5
64
8
7
C6
(optional)
EFFICIENCY (%)
Efficiency vs.Load Current
V
OUT
=3.3V
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10
LOAD CURRENT(A)
V
IN
=4.75V
V
IN
=12V
V
IN
=23V
