MP3398E

4-String, Max 400mA/String, 80V Return,

Step-Up, WLED Controller

MP3398E Rev. 1.02

www.MonolithicPower.com

1

7/31/2017

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© 2017 MPS. All Rights Reserved.

DESCRIPTION

The MP3398E is a step-up controller with four

current channels designed to drive WLED

arrays

for

large

LCD

panel

backlighting

applications. The MP3398E is able to expand

the number of LED channels with two or more

ICs in parallel sharing a single power source.

The MP3398E employs peak-current mode with

a fixed switching frequency. The frequency is

programmable

through

an

external

setting

resistor. The MP3398E drives an external

MOSFET to boost up the output voltage from a

4.5V to 33V input supply and regulates the

current in each LED string to the value set by

an external current-setting resistor.

The MP3398E applies four internal current

sources for current balancing. The current

matching achieves 2.3% regulation accuracy

between strings. The low regulation voltage on

the LED current sources reduces power loss.

The MP3398E supports direct PWM dimming

and analog dimming with PWM input. Full

protection

features

include

over-current

protection (OCP), over-temperature protection

(OTP), under-voltage protection (UVP), over-

voltage

protection

(OVP),

LED

short/open

protection, and inductor/diode short protection.

The MP3398E is available in TSSOP-16EP and

PDIP-16 packages.

FEATURES

 4-String, Max 400mA/String WLED Driver

 4.5V to 33V Input Voltage Range

 80V ABS Rating for Each String

 2.3% Current Matching Accuracy between

Each String

 Direct PWM Dimming Mode

 Analog Dimming Mode with PWM Input

 Cascading Capability with a Single Power

Source

 LED Open and Short Protection

 Programmable Recoverable Over-Voltage

Protection (OVP)

 202mV Latch-Off Cycle-by-Cycle Current

Limit Threshold

 Latch-Off

Over-Temperature

Protection

(OTP)

 Short Inductor/Diode Protection

 Available in TSSOP-16EP and PDIP-16

Packages

APPLICATIONS

 Desktop LCD Flat Panel Displays

 All-in-One PCs

 2D/3D LCD TVs

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.