EV0062 (MP1541)
1.3MHz Low Power
LED Torch/Flash Driver
Monolithic Power Systems
EVALUATION BOARD - INITIAL RELEASE
GENERAL DESCRIPTION
The EV0062 is an evaluation board designed to
drive up to four (4) white LEDs in series. The
board is based on MPS’ MP1541 SOT23
current mode step up converter. The MP1541 is
intended for small, low power applications. The
MP1541 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 the battery
life. The MP1541 operates from an input voltage
as low as 2.5V and can generate 12V at up to
200mA from a 5V supply.
The MP1541 includes under-voltage lockout,
current limiting and thermal overload protection
preventing damage in the event of an output
overload. The MP1541 is available in a small
5-lead TSOT23 package.
FEATURES
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On Board Power MOSFET
Uses Tiny Capacitors and Inductors
1.3MHz Fixed Switching Frequency
Internally Compensated
Internal Soft Start
Operates with Input Voltage as Low as 2.5V
and Output Voltage as High as 22V
12V at 200mA from 5V Input
UVLO, Thermal Shutdown
Internal Current Limit
Available in a TSOT23-5 Package
Camera Phone Flash
Handheld Computers and PDAs
Digital Still and Video Cameras
External Modems
Small LCD Displays
White LED Driver
APPLICATIONS
ELECTRICAL SPECIFICATION
Parameter
Supply Voltage
LED Current (Torch)
LED Current (Flash)
Symbol
V
IN
I
OUT
1
I
OUT
2
Value
2.5 – 6
20
100
Units
V
mA
mA
, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
EV0062 EVALUATION BOARD
Waveform in Flash Mode
V
FLASH
2V/Div.
0
V
OUT
5V/Div.
0
(2.5”X x 2.5”Y x 0.8”Z)
Board Number
EV0062 Rev. B
MPS IC Number
MP1541
V
IN
= 3.6V (3 LEDs)
EV0062_MP1541_TAC_EC01
06/04, Rev. 1.0
www.MonolithicPower.com
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MPS [ MONOLITHIC POWER SYSTEMS ]
