MP3391 Datasheet, PDF (1/18 Pages) Monolithic Power Systems – 8-Channel, 120mA/ch Step-Up WLED Driver Controller

The Future of Analog IC Technology
DESCRIPTION
The MP3391 is a step-up controller with 8-
channel current sources designed for driving
the WLED arrays for large size LCD panel
backlighting applications.
The MP3391 uses current mode, fixed
frequency architecture. The switching frequency
is programmable by an external frequency
setting resistor. It drives an external MOSFET
to boost up the output voltage from a 9V to 35V
input supply. The MP3391 regulates the current
in each LED string to the programmed value set
by an external current setting resistor.
The MP3391 applies 8 internal current sources
for current balance. And 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.
PWM dimming is implemented with external
PWM input signal or DC input signal. The
dimming PWM signal can be generated
internally, and the dimming frequency is
programmed by an external setting capacitor.
MP3391
8-Channel, 120mA/ch Step-Up
WLED Driver Controller
FEATURES
• 9V to 35V Input Voltage Range
• 10V MOSFET Gate Driver
• Drive Selectable 8, 6 and 4 Strings of LEDs
• Maximum 120mA for Each String
• 2.5% Current Matching Accuracy Between
Strings
• Programmable Switching Frequency
• PWM or DC Input Burst PWM Dimming
• Open/Short protection and Fault Flag
Output
• Programmable Short Protection Voltage and
Time Threshold
• Programmable Over-voltage Protection
• Flexible Extendable LED Channels
Application
• Thermal Shutdown
• 28-pin TSSOP and 28-pin SOIC Package
APPLICATIONS
• Desktop LCD Flat Panel Displays
• Flat Panel Video Displays
• 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.
MP3391 Rev. 1.11
www.MonolithicPower.com
1
3/14/2013
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