MP3394

Step-up, 4-String

Max 200mA/String White LED Driver

MP3394 Rev. 1.07

www.MonolithicPower.com

1

3/21/2013

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

© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3394 is a step-up controller with 4-

channel current sources designed for driving

the WLED arrays for large size LCD panel

backlighting applications.

The MP3394 is

flexible for extending LED channels with two or

more MP3394s in parallel while operating from

a single inductor power source.

The

MP3394

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 5V to 28V

input supply. The MP3394 regulates the current

in each LED string to the programmed value set

by an external current setting resistor.

The MP3394 applies 4 internal current sources

for current balance and the current matching

can achieve 2.5% regulation accuracy between

strings. Its low 350mV 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

• 4-String, Max 200mA/String WLED Driver

• 5V to 28V Input Voltage Range

• 2.5% Current Matching Accuracy Between

Strings

• Programmable Switching Frequency

• PWM or DC Input Burst PWM Dimming

• Open and Short LED Protection

• Programmable Over-Voltage Protection

• Cascading Capability with a Single Power

Source

• Under Voltage Lockout

• Thermal Shutdown

• TSSOP16EP，SOIC16, SOIC20 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.

TYPICAL APPLICATION

VIN

5V~28V

MP3394

ISENSE

EN

OSC

BOSC

DBRT

OVP

LED1

LED2

LED3

5

7

3

6

13

12

11

10

Enable

DIMMING

L1

D1

R1

R2

M1

LED4

9

8

VIN

VCC

COMP

15

16

1

2

ISET

GATE

14

GND

4