TM
MP1540
1.3MHz, 18V
Step-Up Converter
The Future of Analog IC Technology
TM
DESCRIPTION
The MP1540 is a 5-pin thin TSOT23 current
mode step-up converter intended for small, low
power applications. The MP1540 switches at
1.3MHz and allows the use of tiny, low cost
capacitors and inductors 2mm or less in height.
Internal soft-start results in small inrush current
and extends battery life. The MP1540 operates
from an input voltage as low as 2.5V and can
generate 12V at up to 200mA from a 5V
supply.
The MP1540 includes under voltage lockout,
current limiting, and thermal overload
protection to prevent damage in the event of an
output overload. The MP1540 is available in a
small 5-pin TSOT23 package.
FEATURES
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On Board Power MOSFET
Uses Tiny Capacitors and Inductors
1.3MHz Fixed Switching Frequency
Internal Soft-Start
Operates with Input Voltage as Low as
2.5V and Output Voltage as High as 18V
12V at 200mA from 5V Input
UVLO, Thermal Shutdown
Internal Current Limit
Available in a TSOT23-5 Package
APPLICATIONS
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Camera Phone Flash
Handheld Computers and PDAs
Digital Still and Video Cameras
External Modems
Small LCD Displays
White LED Driver
“MPS” and “The Future of Analog IC Technology” are Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
V
IN
5V
D1
V
OUT
12V
200mA
Efficiency vs Load Current
100
95
90
V
IN
= 5V
EFFICIENCY (%)
85
80
75
70
65
60
55
50
0
75 150 225 300 375 450
LOAD CURRENT (mA)
MP1540_TAC_EC01
5
OFF ON
4
2
IN
EN
GND
1
SW
V
IN
= 3.3V
V
IN
= 4.2V
MP1540
FB
3
MP1540_TAC01
MP1540 Rev. 1.0
8/15/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
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