MP3304

36V, 1.3A, Step-up

White LED Driver

with High Frequency True PWM Dimming

MP3304 Rev. 0.91

www.MonolithicPower.com

1

4/19/2010

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

© 2010 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3304 is a monolithic step-up converter

designed for driving arrays of WLEDs from 5V

input or a single cell Lithium Ion battery. The

MP3304 uses current mode, fixed frequency

architecture to regulate the LED current, which is

measured through an external current sense

resistor. Its low 200mV feedback voltage reduces

power loss and improves efficiency.

The MP3304 features up to 50kHz true PWM

dimming, which allows the flexible control of the

backlighting luminance under wide range of the

ambient brightness, and also avoids

the

possibility of PWM dimming audible noise.

The MP3304 is turned off if an over-voltage

condition is present due to an open circuit

condition. MP3304 also includes under-voltage

lockout, current limiting and thermal overload

protection preventing damage in the event of an

output overload.

The MP3304 is available in small 8-pin QFN

2x3mm package.

FEATURES

• Internal Power MOSFET

• Drives up to 10 Series White LEDs

• Up to 88% Efficiency

• PWM Dimming Frequency from 250Hz to

50kHz

• 2.2MHz Fixed Switching Frequency

• Open Load Shutdown

• Low 200mV Feedback Voltage

• UVLO, Thermal Shutdown

• Internal 1.3A Current Limit

• Available in 2x3mm QFN8 Package

APPLICATIONS

• LCD Panels

• Digital Picture Frames

• Handheld Computers and PDAs

• Digital Still Cameras

• Small LCD Displays

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

are Registered Trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP3304

5V

Enable/

Dimming

Control

LED1

LED2

LED3

LED28

LED29

LED30

IN

EN

GND

LED

ISET

SW

String 1

String 10

...

C1

C2

L

D

50

60

70

80

90

100

3 3.5

4 4.5

5 5.5

6 6.5