MP3399 Datasheet, PDF (1/19 Pages) Monolithic Power Systems – 12-String, Cascading White LED Driver For Extending LED Channels

The Future of Analog IC Technology
MP3399
12-String, Cascading White LED Driver
For Extending LED Channels
DESCRIPTION
The MP3399 is a step-up controller with 12-
channel current sources designed for driving
the WLED arrays for large size LCD panel
backlighting applications. The MP3399 is
flexible for extending LED channels with two or
more MP3399s in parallel while operating from
a single Inductor power source.
The MP3399 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 5V to 28V input
supply. The MP3399 regulates the current in
each LED string to the programmed value set by
an external current setting resistor.
The MP3399 applies 12 internal current
sources for current balance. And the current
matching can achieve 2.5% regulation accuracy
between strings. Its low 600mV 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.
FEATURES
• 12 String, 60mA/String WLED Driver
• Cascading Capability with a single Power
Source
• 5V to 28V Input Voltage Range
• Maximum 60mA for Each String
• 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
• Under Voltage Lockout
• 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.
MP3399 Rev. 1.0
www.MonolithicPower.com
1
3/27/2013
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