TM
MP1543
1.5A, 500KHz Synchronous
Rectified Step-up Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP1543 is a highly efficient, synchronous,
fixed frequency, current-mode step-up converter
with output to input disconnect, inrush current
limiting and internal soft-start. It includes an error
amplifier, ramp generator, comparator, N-Channel
switch and P-Channel synchronous rectified
switch (which greatly improves efficiency). The
output disconnect feature allows the output to be
completely isolated from the input in shutdown
mode.
The 500KHz switching frequency allows for
smaller external components producing a
compact solution for a wide range of load
currents. The internal compensation and soft-start
minimizes the external component count and
limits the inrush current during startup. The
MP1543 regulates the output voltage up to 6V
and provides up to 400mA from a 2-cell AA with
a 3.3V output.
The MP1543 is offered in a thin SOT23-5
package.
FEATURES
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Over 90% Efficiency
Output to Input Disconnect at Shutdown Mode
Internal Synchronous Rectifier
Inrush Current Limiting and Internal Soft-Start
Internal Compensation
1.5A Typical Switch Current Limit
500KHz Fixed Switching Frequency
Zero Current Shutdown Mode
Thermal Shutdown
5-Pin TSOT-23 Package
MP3 Players
Handheld Computers and PDAs
Digital Still and Video Cameras
External Modems
Small LCD Displays
APPLICATIONS
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
EVALUATION BOARD REFERENCE
Board Number
EV1543DJ-01A
Dimensions
2.4”X x 2.4”Y x 0.4”Z
TYPICAL APPLICATION
Efficiency vs
Load Current
V
IN
1.8V - 3.2V
100
90
EFFICIENCY (%)
4
SW
OUT
3
V
IN
=3V
80
70
60
50
40
30
1
V
OUT
=3.3V
10
100
LOAD CURRENT (mA)
1000
V
IN
=2.4V
V
IN
=1.8V
EN
5
EN
MP1543
GND
2
FB
1
V
OUT
3.3V
400mA
MP1543-EC01
MP1543 Rev. 1.0
1/11/2006
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2006 MPS. All Rights Reserved.
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