MP1567
1.2A Synchronous Rectified
Step-Down Converter
MP1567 Rev. 2.3 www.MonolithicPower.com 1
1/3/2006 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
The Future of Analog IC Technology
TM
TM
DESCRIPTION
The MP1567 is a 1.2A, 800KHz DC to DC
converter designed for low voltage applications
requiring high efficiency. Capable of providing
output voltages as low as 0.9V from a 3.3V
supply voltage, the MP1567 eliminates the
need for a 5V rail, providing over 90% efficiency
via synchronous rectification and eliminating
heat issues in confined spaces. Soft-start
operation protects internal circuitry from hard
turn on issues. Switching at 800KHz reduces
the size of external components and thereby
reduces board space.
The MP1567 includes cycle-by-cycle current
limiting and under voltage lockout. Internal
power switches combined with the tiny 10-pin
MSOP or QFN packages provide a solution
requiring a minimum of space.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV0033 (MP1567DK) 2.5”X x 2.0”Y x 0.7”Z
EV0059 (MP1567DK) 2.5”X x 2.0”Y x 0.4”Z
EV0060 (MP1567DQ) 2.5”X x 2.0”Y x 0.4”Z
FEATURES
• 1.2A Output Current
• Synchronous Rectified
• Internal 180m and 220m Power Switches
• V
IN
Range of 2.6V to 6V
• Over 90% Efficiency
• Zero Current Shutdown Mode
• Under Voltage Lockout Protection
• Soft-Start Operation
• Thermal Shutdown
• Internal Current Limit (Source & Sink)
• Tiny 10-Pin MSOP or QFN Packages
• Evaluation Boards Available
APPLICATIONS
• SOHO Routers, PCMCIA Cards, Mini PCI
• Handheld Computers, PDAs
• Cell Phones
• Digital Video Cameras
• Small LCD Displays
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
MP1567
SW
IN BS
1
3
7
9
845
6
10
2
FB
BP
SS
COMPSGND PGND
EN
V
OUT
1.8V/1.2A
INPUT
2.6V to 6V
OPEN IF
NOT USED
MP1567_TAC_S01
OFF ON
10nF
10nF
1nF
10nF
100
90
80
70
60
50
40
30
20
10
0
EFFICIENCY (%)
10 100 1000
LOAD CURRENT (mA)
MP1567_EC01
Efficiency vs
Load Current
V
IN
=5V
V
IN
=4V
V
IN
=3.3V
V
OUT
=1.8V