MP3393

8-String Step-Up White LED Driver

with External Transistor

MP3393 Rev. 1.05

www.MonolithicPower.com

1

3/26/2013

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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.

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.