MP3394S

Step-Up, 4-String

Max 200mA/String White LED Driver

MP3394S Rev. 1.03

www.MonolithicPower.com

1

3/21/2013

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© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3394S is a step-up controller with 4

current channels. It’s designed to drive WLED

arrays for large-size LCD-panel backlighting

applications. The MP3394S is flexible, and can

expand the number of LED channels with 1 or 2

MP3394S in parallel operating from a single

inductive power source.

The MP3394S uses an architecture of current –

mode and fixed operation frequency The

frequency is programmable by an external

frequency-setting resistor. MP3394S drives an

external MOSFET to boost up the output

voltage from a 5V to 28V input supply. It

regulates the current in each LED string to the

programmed value set by an external current-

setting resistor.

The MP3394S applies 4 internal current

sources for current balance. 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.

An external PWM input signal or DC input

signal controls PWM dimming. In DC-input

dimming mode, 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

and

SOIC20

Packages

APPLICATIONS

• Desktop LCD Flat Panel Displays

• Flat Panel Video Displays

• 2D/3D 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

5

7

3

6

13

12

11

10

9

8

15

16

1

2

14

4

VIN

Enable

5V to 28V

R1

D1

L1

VIN

VCC

COMP

EN

OSC

BOSC

DBRT

ISET

LED4

LED3

LED2

LED1

OVP

GND

ISENSE

GATE

MP3394S

R2

M1

DIMMING