MP3394S
Step-Up, 4-String
Max 200mA/String White LED Driver
The Future of Analog IC Technology
DESCRIPTION
FEATURES
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4-String, Max 200mA/String WLED Driver
5V to 28V Input Voltage Range
2.5% Current Matching Accuracy Between
Strings
The MP3394S is a step-up controller with 4
current channels. It’s designed to drive WLED
arrays for large-size LCD-panel backlighting
applications. The MP3394S is flexible, and can
expand the number of LED channels with 1 or 2
MP3394S in parallel operating from a single
inductive power source.
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Programmable Switching Frequency
PWM or DC Input Burst PWM Dimming
Open and Short LED Protection
Programmable Over-Voltage Protection
Cascading Capability with a Single Power
Source
The MP3394S uses an architecture of current –
mode and fixed operation frequency The
frequency is programmable by an external
frequency-setting resistor. MP3394S drives an
external MOSFET to boost up the output
voltage from a 5V to 28V input supply. It
regulates the current in each LED string to the
programmed value set by an external current-
setting resistor.
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Under-Voltage Lockout
Thermal Shutdown
TSSOP16EP,
Packages
SOIC16
and
SOIC20
APPLICATIONS
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Desktop LCD Flat Panel Displays
Flat Panel Video Displays
2D/3D LCD TVs and Monitors
The MP3394S applies 4 internal current
sources for current balance. The current
matching can achieve 2.5% regulation accuracy
between strings. Its low regulation voltage on
LED current sources reduces power loss and
improves efficiency.
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
An external PWM input signal or DC input
signal controls PWM dimming. In DC-input
dimming mode, the dimming PWM signal can
be generated internally and the dimming
frequency is programmed by an external setting
capacitor.
TYPICAL APPLICATION
D1
L1
VIN
5V to 28V
CIN
COUT
MP3394S
R1
M1
R2
VIN
GATE
15
16
14
13
VCC
COMP
EN
CVCC
ISENSE
1
C
COMPRCOMP
RSENSE
Enable
2
GND
OSC
5
4
12
11
10
9
ROSC
OVP
BOSC
LED1
7
RBOSC
CBOSC
LED2
LED3
LED4
DIMMING
DBRT
ISET
3
6
8
RSET
MP3394S Rev. 1.03
3/21/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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