MP3399

12-String, Cascading White LED Driver

For Extending LED Channels

MP3399 Rev. 1.0

www.MonolithicPower.com

1

3/27/2013

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© 2013 MPS. All Rights Reserved.

The Future of Analog IC Technology

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.