MP3378E

4-Channel WLED Controller

with High-Efficiency Buck Converter

MP3378E Rev. 1.02

www.MonolithicPower.com

1

5/26/2017

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

© 2017 MPS. All Rights Reserved.

DESCRIPTION

The MP3378E is a one-chip solution specially

designed

for

monitor

applications.

The

MP3378E includes a step-up WLED controller

with four current channels for backlighting, and

a high-efficiency buck converter for internal bus

voltage or standby power.

The 4-string WLED controller drives an external

MOSFET to boost up the output voltage from

the input supply. It regulates the current in each

LED string to the programmed value set by an

external current setting resistor. It supports both

analog and PWM dimming independently to

meet special dimming mode requests. Full

protection features for the WLED controller

include OCP, OTP, UVP, OVP, LED short/open

protection, and inductor/diode short protection.

The high-efficiency buck converter operates in

the current mode operation with a built-in

MOSFET and a built-in synchronous rectifier. It

offers a very compact solution to achieve

excellent

load

and

line

regulation.

Full

protection features for the buck converter

include OCP and thermal shutdown.

The MP3378E is available in a TSSOP-28 EP

package.

FEATURES

WLED Controller:

 4-String,

Max

350mA/String,

WLED

Controller

 Up to 24V Input Voltage Range

 2.5% Current Matching Accuracy

 Programmable Switching Frequency

 PWM and Analog Dimming Mode

 LED Open and Short Protection

 Programmable Over-Voltage Protection

 Recoverable Thermal Shutdown Protection

 Over-Current Protection

 Over-Temperature Protection

 Inductor/Diode Short Protection

Buck Converter:

 144mΩ/80mΩ Low R

DS(ON)

Internal Power

MOSFETs

 Low Quiescent Current

 Fixed 235kHz Switching Frequency

 Frequency Sync from 250kHz to 2MHz

 External Clock

 Internal Soft Start

 OCP and Hiccup Mode

 Over-Temperature Protection

 Output Adjustable from 0.8V

APPLICATIONS

 Desktop LCD Flat Panel Displays

 Flat Panel Video Displays

 2D/3D LCD TVs and Monitors

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

MPS green status, please visit the MPS website under Quality Assurance.

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

Monolithic Power Systems, Inc.