Product Descriptions

The MP3389 is a step-up controller with 12- channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications.

The MP3389 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 MP3389 regulates the current in each LED string to the programmed value set by an external current setting resistor.

The MP3389 applies 12 internal current sources for current balance. And the current matching can achieve 2.5% regulation accuracy between strings. Its low 550mV 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.

Product Features

• High Efficiency and Small Size

• 5V to 28V Input Voltage Range

• Balanced Driver for 12 Strings of WLEDs

• Maximum 60mA for Each String

• 2.5 percent 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

Product Applications

• Desktop LCD Flat Panel Displays

• Flat Panel Video Displays

• LCD TVs and Monitors

Product Photos

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