MP3378

24 V, 4-Channel WLED Controller

Plus High-Efficiency Buck Converter

MP3378 Rev. 1.01

www.MonolithicPower.com

1

5/26/2017

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© 2017 MPS. All Rights Reserved.

DESCRIPTION

The MP3378 is a one-chip solution designed for

monitor applications. It includes a step-up

controller

with

4

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 the special dimming mode request. In

addition, rich protection modes are integrated

including

OCP,

OTP,

UVP,

OVP,

LED

short/open protection, and inductor/diode short

protection.

The high-efficiency buck converter operates in

current mode with a built in MOSFET and

synchronous rectifier. It offers a very compact

solution to achieve excellent load and line

regulation. Full protection features include OCP

and thermal shutdown.

The MP3378 is available in SOIC28 and

TSSOP28EP package.

FEATURES

WLED Controller:

 4-String,

Max

350

mA/String

WLED

Controller

 Up to 24 V Input Voltage Range

 2.5% Current Matching Accuracy

 Programmable Switching Frequency

 PWM and Analog Dimming Mode

 Open and Short LED Protection

 Programmable Over-Voltage Protection

 Recoverable Thermal Shutdown Protection

 Over-Current Protection

 Over-Temperature Protection

 Inductor/Diode Short Protection

Buck Converter:

 144 mΩ/58 mΩ Low Rds(on) Internal Power

MOSFETs

 Low Quiescent Current

 Fixed 235 kHz Switching Frequency

 Frequency Sync from 250 kHz to 2 MHz

External Clock

 AAM Power-Save Mode

 Internal Soft Start

 OCP and Hiccup

 Over-Temperature Protection

 Output Adjustable from 0.8 V

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.