MP3398H
4-String, Max 400mA/String, 80V Return,
Step-Up WLED Controller
DESCRIPTION
FEATURES
The MP3398H is a step-up controller with four
LED current channels, designed to drive WLED
arrays for large LCD panel backlighting
applications. The MP3398H can expand the
number of LED channels with two or more ICs
in parallel sharing a single power source.
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4-String, Max 400mA/String WLED Driver
4.5V to 33V Input Voltage (VIN) Range
80V Absolute Maximum Rating for Each
String
1.5% Current Matching Accuracy between
Each String
Direct Pulse-Width Modulation (PWM)
Dimming Mode
Analog Dimming Mode via PWM Input or
DC Input
Cascading Capability with a Single Power
Source
LED Open and Short Protection
Configurable, Recoverable Over-Voltage
Protection (OVP)
540mV Cycle-by-Cycle Current Limit
Hiccup Over-Temperature Protection (OTP)
Short Inductor and Diode Protection
Available in an SOIC-16 Package
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The MP3398H employs peak current control
mode with a fixed switching frequency (fSW) that
is configurable via an external setting resistor.
The MP3398H drives an external MOSFET to
boost the output voltage (VOUT) from a 4.5V to
33V input voltage (VIN) supply. The device also
regulates the current in each LED string to the
value set by an external current-setting resistor.
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The MP3398H applies four internal current
sources for current balancing. It achieves 1.5%
current matching regulation accuracy between
the strings. The low regulation voltage on the
LED current sources reduces power loss.
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The MP3398H supports direct pulse-width
modulation (PWM) dimming mode with a PWM
input and analog dimming mode with a PWM
input or DC input. Full protection features
include over-current protection (OCP), over-
temperature protection (OTP), under-voltage
protection (UVP), over-voltage protection (OVP),
LED short and open protection, and inductor
and diode short protection.
APPLICATIONS
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Desktop LCD Flat-Panel Displays
All-in-One PCs
2D and 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,” the MPS logo, and “Simple, Easy Solutions” are
trademarks of Monolithic Power Systems, Inc. or its subsidiaries.
The MP3398H is available in an SOIC-16
package.
MP3398H Rev. 1.0
9/16/2022
MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
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