EV0062 (MP1541)
1.3MHz Low Power
LED Torch/Flash Driver
EVALUATION BOARD - INITIAL RELEASE
06/04, Rev. 1.0 www.MonolithicPo wer.com 1
Monolithic Power Systems
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.
ELECTRICAL SPECIFICATION
Parameter Symbol Value Units
Supply Voltage V
IN
2.5 – 6 V
LED Current (Torch) I
OUT
1 20 mA
LED Current (Flash) I
OUT
2 100 mA
FEATURES
• 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
APPLICATIONS
• Camera Phone Flash
• Handheld Computers and PDAs
• Digital Still and Video Cameras
• External Modems
• Small LCD Displays
• White LED Driver
, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC
Technology” are Registered Trademarks of Monolithic Power Systems, Inc.
EV0062 EVALUATION BOARD
(2.5”X x 2.5”Y x 0.8”Z)
Board Number MPS IC Number
EV0062 Rev. B MP1541
0
0
V
FLASH
2V/Div.
V
OUT
5V/Div.
V
IN
= 3.6V (3 LEDs)
EV0062_MP1541_TAC_EC01
W aveform in Flash Mode
