EV3373-M-00A

8 Strings, Step Up WLED Controller

with External Transistor

EV3373-M-00A Rev.1.0

www.MonolithicPower.com

1

7/11/2014

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

© 2014 MPS. All Rights Reserved.

The Future of Analog IC Technology

DESCRIPTION

The MP3373 is a step-up controller with 8-

channel external current sources designed for

driving the WLED arrays for large size LCD

panel backlighting applications.

The MP3373 employs peak current mode, fixed

frequency architecture to provide robust operation

with 9V to 40V input supply. The switching

frequency is programmable by an external

frequency setting resistor.

The MP3373 integrates the constant current

control circuit to regulate each LED string current

to the programmed value set by an external

resistor. And the current matching can achieve

1.2% regulation accuracy between strings. Its

low 200mV regulation voltage on LED current

sources reduces power loss and improves

efficiency.

To reduce inrush current and the stress of

components, MP3373 employs the phase shift

PWM dimming mode which can be disabled by

pulling PSEN pin to GND.

MP3373 also includes UVLO, LED short/open

protection, inductor/diode short protection and

thermal shut down protection. All fault status is

indicated by fault flag signal.

The MP3373 is flexible for extending LED

channels with two or three ICs in parallel with

sharing one power stage. It is available in

TSSOP28 and SOIC28 packages.

ELECTRICAL SPECIFICATIONS

Parameter

Symbol

Value

Units

Input

Voltage

9 – 28

V

LEDs #

8 LED string

10 LEDs/string

LED Current

200/string

mA

FEATURES

• 9V to 40V Input Voltage Range

• 8-Channel LED strings with external current

balance

• 1.2% Current Matching Accuracy Between

Strings

• Programmable Switching Frequency

• External PWM Dimming

• Selectable Phase Shift Function at PWM

DIM Mode

• Open/Short LED Protection

• Short Inductor/Diode Protection

• Programmable Over-voltage Protection

• Thermal Shutdown

• Fault Flag Output

• Extendable LED Channels with Share One

Set of Power Stage

• TSSOP-28 and SOIC-28 Packages

APPLICATIONS

• LCD Flat Panel 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 Products, Quality Assurance page.

“MPS” and “The Future of Analog IC Technology” are registered trademarks of

Monolithic Power Systems, Inc.