MP3305

36V, 1.3A, Step-up

White LED Driver

with High Frequency True PWM Dimming & Adjust OVP

MP3305 Rev. 1.0

www.MonolithicPower.com

1

4/10/2013

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3305 is a monolithic step-up converter

designed for driving arrays of WLEDs from 5V

input or a single cell Lithium Ion battery. The

MP3305 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 MP3305 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 MP3305 is turned off if an over-voltage

condition is present due to an open circuit

condition. Use one external resistor voltage

divider to adjust OVP threshold. MP3305 also

includes under-voltage lockout, current limiting

and thermal overload protection preventing

damage in the event of an output overload.

The MP3305 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

• Adjustable Open Load Shutdown Threshold

(OVP)

• Low 200mV Feedback Voltage

• UVLO, Thermal Shutdown

• Internal 1.3A Current Limit

• Available in 2mm x 3mm QFN8 Package

APPLICATIONS

• LCD Panels

• Digital Picture Frames

• Handheld Computers and PDAs

• Digital Still Cameras

• Small LCD Displays

All MPS parts are lead-free and adhere to the RoHS directive. For MPS green

status, please visit MPS website under Quality Assurance. “Monolithic Power

Systems”, “MPS”, and “The Future of Analog IC Technology” are Registered

Trademarks of Monolithic Power Systems, Inc.

TYPICAL APPLICATION

MP3305

5V

Enable/

Dimming

Control

LED1

LED2

LED3

R2

R1

L

D

C1

C2

LED28

LED29

LED30

IN

EN

GND

LED

ISET

OVP

SW

String 1

String 10

...

50

60

70

80

90

100

3 3.5

4 4.5

5 5.5

6 6.5