MP3391

8-Channel, 120mA/ch Step-Up

WLED Driver Controller

MP3391 Rev. 1.11

www.MonolithicPower.com

1

3/14/2013

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© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3391 is a step-up controller with 8-

channel current sources designed for driving

the WLED arrays for large size LCD panel

backlighting applications.

The

MP3391

uses

current

mode,

fixed

frequency architecture. The switching frequency

is programmable by an external frequency

setting resistor. It drives an external MOSFET

to boost up the output voltage from a 9V to 35V

input supply. The MP3391 regulates the current

in each LED string to the programmed value set

by an external current setting resistor.

The MP3391 applies 8 internal current sources

for current balance. And the current matching

can achieve 2.5% regulation accuracy between

strings. Its low regulation voltage on LED

current sources reduces power loss and

improves efficiency.

PWM dimming is implemented with external

PWM input signal or DC input signal. The

dimming PWM signal can be generated

internally, and the dimming frequency is

programmed by an external setting capacitor.

FEATURES

• 9V to 35V Input Voltage Range

• 10V MOSFET Gate Driver

• Drive Selectable 8, 6 and 4 Strings of LEDs

• Maximum 120mA for Each String

• 2.5% Current Matching Accuracy Between

Strings

• Programmable Switching Frequency

• PWM or DC Input Burst PWM Dimming

• Open/Short protection and Fault Flag

Output

• Programmable Short Protection Voltage and

Time Threshold

• Programmable Over-voltage Protection

• Flexible

Extendable

LED

Channels

Application

• Thermal Shutdown

• 28-pin TSSOP and 28-pin SOIC Package

APPLICATIONS

• Desktop LCD Flat Panel Displays

• Flat Panel Video Displays

• LCD TVs and Monitors

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

status, please visit MPS website under Quality Assurance. “MPS” and “The

Future of Analog IC Technology” are Registered Trademarks of Monolithic

Power Systems, Inc.