MPS CONFIDENTIAL
DO NOT DISTRIBUTE
EV3398T-F-00A
4 strings, 80V Return Voltage WLED Driver
Evaluation Board
EV3398T-F-00A Rev.1.0 www.MonolithicPower.com 1
1/12/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP3398T 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 able to expand
the number of LED channels with two or more
ICs in parallel sharing a single power source.
The MP3398T uses peak-current mode with a
fixed switching frequency. The frequency is
programmable through an external setting
resistor. The MP3398T drives an external
MOSFET to boost up the output voltage from a
4.5V to 33V input supply. It regulates the
current in each LED string to the value set by
an external current-setting resistor.
The MP3398T applies 4 internal current
sources for current balance. The current
matching can achieve 2% regulation accuracy
between strings. Its low regulation voltage on
LED current sources reduces power loss.
The MP3398T supports direct PWM dimming.
In addition, rich protection modes are integrated
including OCP, OTP, UVP, OVP, LED
short/open protection, inductor/diode short
protection.
The MP3398T is available in a TSSOP-16EP
package.
ELECTRICAL SPECIFICATIONS
Parameter Symbol Value Units
Input
Voltage
V
IN
13 – 33 V
LEDs #
4 LED strings
20 LEDs/string
LED Current I
LED
120/string mA
FEATURES
• 4-String, Max 400mA/String WLED Driver
• 4.5V to 33V Input Voltage Range
• 80V Abs. Rating for Each String
• 2% Current Matching Accuracy Between
Each String
• PWM Dimming
• Cascading Capability with a Single Power
Source
• LED Open and Short LED Protection
• Programmable Recoverable Over Voltage
Protection
• 0.2V Latch-off OCP Protection Threshold.
• Recoverable thermal Shutdown Protection
• TSSOP-16EP Package
APPLICATIONS
• Desktop LCD Flat Panel Displays
• All in one
• 2D/3D LCD TVs
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Technology” are registered trademarks o
Monolithic Power Systems, Inc.
