4-String, Max 400mA/String, 80V Return,
Step-Up, WLED Controller
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
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
Direct PWM Dimming Mode
Analog Dimming Mode with PWM Input
Cascading Capability with a Single Power
LED Open and Short Protection
Programmable Recoverable Over-Voltage
202mV Latch-Off Cycle-by-Cycle Current
Latch-Off Over-Temperature Protection
Short Inductor/Diode Protection
Available in TSSOP-16EP and PDIP-16
Desktop LCD Flat Panel Displays
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.
MP3398E Rev. 1.02
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