MP3394S Datasheet, PDF (1/17 Pages) Monolithic Power Systems – Step-Up, 4-String Max 200mA/String White LED Driver

The Future of Analog IC Technology
MP3394S
Step-Up, 4-String
Max 200mA/String White LED Driver
DESCRIPTION
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.
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.
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.
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.
FEATURES
• 4-String, Max 200mA/String WLED Driver
• 5V to 28V Input Voltage Range
• 2.5% Current Matching Accuracy Between
Strings
• 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
• Under-Voltage Lockout
• Thermal Shutdown
• TSSOP16EP, SOIC16 and SOIC20
Packages
APPLICATIONS
• Desktop LCD Flat Panel Displays
• Flat Panel Video 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 Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
VIN
5V to 28V _CIN
L1
MP3394S
Enable
DIMMING
VIN
15
C_VCC
VCC
16
C_COMPR_COMP ^{1 COMP}
EN
2
R_OSC
OSC
5
R_BOSC
BOSC
7
C_BOSC
R_SET
DBRT
3
ISET
6
GATE
14
ISENSE
13
GND
4
OVP
12
LED1
11
LED2
10
LED3
9
LED4
8
D1
C_OUT
R1
M1
R2
R_SENSE
MP3394S Rev. 1.03
www.MonolithicPower.com
1
3/21/2013
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