EV3398E-F-00A
4 strings WLED Controller With 80V Return
Evaluation Board
EV3398E-F-00A Rev.1.0 www.MonolithicPower.com 1
9/6/2016 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The MP3398E is a step-up controller with four
current channels designed to drive WLED
arrays for large size 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.
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
2.3% 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
Recoverable Thermal Shutdown Protection
Available in TSSOP-16EP and PDIP-16
Packages
APPLICATIONS
Desktop LCD Flat Panel Displays
All-in-one PCs
2D/3D LCD TVs
All MP S p ar t s a r e le a d -f r ee a n d a dh e re to th e Ro HS d i r ec t i ve. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
“MPS” and “The Future of Analog IC Te chnology” are register ed tradema rks of
Monolithic Power Systems, Inc.
