MP1523

Precision 6-Lamp

White LED Driver

INITIAL RELEASE

07/04, Rev. 1.6

www.MonolithicPower.com

1

Monolithic Power Systems

DESCRIPTION

The MP1523 is a 5-pin SOT23 step-up

converter designed for driving up to six (6)

series white LEDs from a single-cell Lithium

Ion battery. The MP1523 uses a current

limited, variable frequency architecture to

regulate the LED current, which is measured

through an external current sense resistor. Its

low 0.4V feedback threshold reduces power

loss and improves efficiency. To prevent

damage due to an open circuit condition, the

BIAS pin can measure the output voltage and

turn off the converter if an over-voltage

condition is present.

The MP1523 includes under-voltage lockout,

current

limiting,

and

thermal

overload

protection to prevent damage in the event of

an output overload. The MP1523 is available in

a small 5-pin SOT23 package.

FEATURES

• On Board Power MOSFET

• Drives up to 6 White LEDs

• Up to 90% Efficiency

• Over 80mA Output Current Capacity

• Open Load Shutdown

• Low 0.4V Feedback Threshold

• UVLO, Thermal Shutdown

• Soft-Start

• Internal Current Limiter

• Available in SOT23-5 Package

• Evaluation Board Available

APPLICATIONS

• Cell Phones

• Handheld Computers and PDAs

• Digital Still and Video Cameras

• Small LCD Displays

, “MPS”, “Monolithic Power Systems”, and “The Future of Analog IC

Technology” are Registered Trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP1523

BIAS

SW

FB

GND

EN

23

1

5

4

2.7V to 5.5V

A

Up To

6 LEDs

B

EN

MP1523-TAC-S01

100

90

80

70

60

50

5

10152025

LED CURRENT (mA)

MP1523-EC01