MP3398A

Step up, 4 strings, Max. 350mA/string

Analog and PWM dimming, White LED Controller

MP3398A Rev. 1.04

www.MonolithicPower.com

1

5/26/2017

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

© 2017 MPS. All Rights Reserved.

DESCRIPTION

The MP3398A is a step-up controller with 4

current channels, which is designed to drive

WLED

arrays

for

large-size

LCD-panel

backlighting applications. It is flexible to expand

the number of LED channels by two or more

ICs in parallel sharing a single inductive power

source.

The MP3398A uses peak-current mode with

fixed switching frequency. The frequency is

programmable by an external setting resistor.

The MP3398A 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 value set by an external

current-setting resistor.

The

MP3398A

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.

The MP3398A can support both analog and

PWM dimming independently to meet the

different dimming-mode request. In addition,

rich protection modes are also integrated

including

OCP,

OTP,

UVP,

OVP,

LED

short/open

protection,

inductor/diode

short

protection.

The

MP3398A

is

available

in

SOIC16,

TSSOP16-EP and SOIC20 packages.

FEATURES

 4-String, Max 350mA/String WLED Driver

 5V to 28V Input Voltage Range

 2.5% Current Matching Accuracy Between

Strings

 Programmable Switching Frequency

 PWM and Analog Dimming Mode

 Cascading Capability with a Single Power

Source

 LED Open and Short LED Protection

 Programmable Over-Voltage Protection

 Recoverable Thermal Shutdown Protection

 Over Current Protection

 Inductor/Diode short Protection

 Under-Voltage Lockout

 SOIC16,

TSSOP16-EP

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, halogen 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