MP1542
700KHz/1.3MHz Boost Converter
with a 2A Switch
MP1542 Rev. 1.2 www.MonolithicPower.com 1
12/14/2005 MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP1542 is a current mode step up
converter with a 2A, 0.18 internal switch to
provide a highly efficient regulator with fast
response. The MP1542 can be operated at
700KHz or 1.3MHz allowing for easy filtering
and low noise. An external compensation pin
gives the user flexibility in setting loop
dynamics, which allows the use of small, low-
ESR ceramic output capacitors. Soft-start
results in small inrush current and can be
programmed with an external capacitor. The
MP1542 operates from an input voltage as low
as 2.5V and can generate 12V at up to 500mA
from a 5V supply.
The MP1542 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP1542 is available in low profile
8-pin MSOP packages.
EVALUATION BOARD REFERENCE
Board Number Dimensions
EV1542DK-00A 2.0”X x 2.0”Y
FEATURES
• 2A, 0.18, 25V Power MOSFET
• Uses Tiny Capacitors and Inductors
• Pin Selectable 700KHz or 1.3MHz Fixed
Switching Frequency
• Programmable Soft-Start
• Operates with Input Voltage as Low as 2.5V
and Output Voltage as High as 22V
• 12V at 500mA from 5V Input
• UVLO, Thermal Shutdown
• Internal Current Limit
• Available in 8-Pin MSOP Packages
APPLICATIONS
• LCD Displays
• Portable Applications
• Handheld Computers and PDAs
• Digital Still and Video Cameras
“MPS” and “The Future of Analog IC Technology” are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
V
IN
3.3V
V
OUT
8V
MP1542
SWIN
FB
COMP
1
2
6
7
3
8
4
5
SS
GND
EN
FSEL
OFF ON
MP1542_TAC01
D1
C4
10nF
C3
2.2nF
95
90
85
80
75
70
65
60
55
50
EFFICIENCY (%)
LOAD CURRENT (mA)
MP1542-EC02
Efficiency vs
Load Current
1 10 100 1000
V
IN
= 3.3V
V
OUT
= 8V
