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EV0062

1.3MHz Low Power LED Torch/Flash Driver

Monolithic Power Systems 

Monolithic Power Systems

EV0062 (MP1541)

1.3MHz Low Power

LED Torch/Flash Driver

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.

ELECTRICAL SPECIFICATION

Parameter

Symbol Value Units

Supply Voltage

LED Current (Torch)

LED Current (Flash)

VIN

2.5 – 6

V

IOUT1

20

mA

IOUT2

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

Waveform in Flash Mode

VFLASH

2V/Div.

0

VOUT

5V/Div.

0

VIN = 3.6V (3 LEDs)

EV0062_MP1541_TAC_EC01

06/04, Rev. 1.0

www.MonolithicPower.com

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