MP3373
8 Strings, Step Up WLED Controller
with External Transistor
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The MP3373 is a step-up controller with 8-
channel external current sources designed for
driving the WLED arrays for large size LCD
panel backlighting applications.
9V to 40V Input Voltage Range
8-Channel LED strings with external current
balance
1.2% Current Matching Accuracy Between
Strings
Programmable Switching Frequency
External PWM Dimming
Selectable Phase Shift Function at PWM
DIM Mode
The MP3373 employs peak current mode, fixed
frequency architecture to provide robust operation
with 9V to 40V input supply. The switching
frequency is programmable by an external
frequency setting resistor.
Open/Short LED Protection
Short Inductor/Diode Protection
Programmable Over-voltage Protection
Thermal Shutdown
Fault Flag Output
Extendable LED Channels with Share One
Set of Power Stage
The MP3373 integrates the constant current
control circuit to regulate each LED string current
to the programmed value set by an external
resistor. And the current matching can achieve
1.2% regulation accuracy between strings. Its
low 200mV regulation voltage on LED current
sources reduces power loss and improves
efficiency.
TSSOP-28 and SOIC-28 Packages
To reduce inrush current and the stress of
components, MP3373 employs the phase shift
PWM dimming mode which can be disabled by
pulling PSEN pin to GND.
APPLICATIONS
LCD Flat Panel Displays
2D/3D LCD TVs and Monitors
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.
MP3373 also includes UVLO, LED short/open
protection, inductor/diode short protection and
thermal shut down protection. All these faults are
indicated by the fault flag signal.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
The MP3373 is flexible for extending LED
channels with two or three ICs in parallel with
sharing one power stage. It is available in
TSSOP-28 and SOIC-28 packages.
MP3373 Rev. 1.02
8/16/2016
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2016 MPS. All Rights Reserved.
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