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 currentsetting
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 Syst
