MP3398D

4-String, Max 350mA/String, Step-Up,

White LED Controller with

Analog and PWM Dimming

MP3398D Rev. 1.0

www.MonolithicPower.com

1

5/23/2016

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

© 2016 MPS. All Rights Reserved.

DESCRIPTION

The MP3398D is a step-up controller with four

current channels designed to drive WLED

arrays

for

large

LCD

panel

backlighting

applications. The MP3398D allows for flexible

expansion of the number of LED channels by

two or more ICs in parallel sharing a single

inductive power source.

The MP3398D employs peak-current mode with

a fixed switching frequency. The frequency is

programmable by an external setting resistor.

The MP3398D drives an external MOSFET to

boost up the output voltage from a 5V to 28V

input supply and can regulate the current in

each LED string to the value set by an external

current-setting resistor.

The MP3398D applies four internal current

sources for current balancing. The current

matching can achieve 2.5% regulation accuracy

between strings. The low regulation voltage on

the LED current sources reduces power loss.

The MP3398D can support both analog and

PWM dimming independently to meet different

dimming

mode

requests.

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 MP3398D is available in SOIC16 and

SOIC20 packages.

FEATURES

• 4-String, 350mA/String Max 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

(OVP)

• Recoverable Thermal Shutdown

• Over-Current Protection (OCP)

• Inductor/Diode Short Protection

• Under-Voltage Lockout (UVLO)

• Available in SOIC16 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 the MPS website under Quality Assurance.

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

Monolithic Power Systems, Inc.

TYPICAL APPLICATION

VCC

COMP

EN

OSC

ADIM

ISET

MP3398D

16

1

2

5

7

6

C1

L1

VIN

GND

C2

VOUT

C3

R1

R2

VIN

15

PWM

3

R4

GATE

ISENSE

GND

OVP

LED1

LED2

LED3

LED4

D1

14

13

4

12

11

10

9

8

R3

C4

R5

R6