MP3393 Datasheet, PDF (1/19 Pages) Monolithic Power Systems – 8-String Step-Up White LED Driver with External Transistor

The Future of Analog IC Technology
DESCRIPTION
The MP3393 is a step-up controller with 8
current channel sources designed to power
WLED backlights for large LCD panels.
The MP3393 uses current-mode fixed-frequency
architecture. It drives an external MOSFET to
boost the output voltage. The switching frequency
is programmable by an external setting resistor.
The MP3393 integrates a constant-current control
circuit to regulate the current in each LED string
to the value set by an external current feedback
resistor. Current matching can achieve 1.2%
regulation accuracy between strings. Its low
202mV regulation voltage reduces power loss
and improves efficiency.
The MP3393 includes protections including
under-voltage lockout, LED open/short protection,
and thermal shutdown. The fault flag pin indicates
the statuses of all fault signals.
The MP3393 can be daisy-chained to expand
the number of LED channels. It is available in
TSSOP28EP and SOIC28 packages.
MP3393
8-String Step-Up White LED Driver
with External Transistor
FEATURES
• 9V-to-32V Input Voltage Range
• Drives 8 Channels of LED strings
• Internal Constant-Current Control
• Maximum Channel Current Over 350mA
• 1.2% Current Matching Accuracy Between
Strings
• Programmable Switching Frequency
• Analog Dimming and External PWM
Dimming
• Open and Short LED Protection
• Programmable Over-Voltage Protection
• Fault Output Flag
• Thermal Shutdown
• Extendable LED Channels that Share One
Power Stage Set
• TSSOP28EP and SOIC28 Packages
APPLICATIONS
• Flat Panel Video Displays
• LCD TVs and Monitors
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status, please visit MPS website under Quality Assurance.
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Monolithic Power Systems, Inc.
MP3393 Rev. 1.05
www.MonolithicPower.com
1
3/26/2013
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