Monolithic Power Systems MP3391

Description

The MP3391 is a step-up controller with 8- channel current sources designed for driving the WLED arrays for large size LCD panel backlighting applications.

The MP3391 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 9V to 35Vinput supply. The MP3391 regulates the current in each LED string to the programmed value set by an external current setting resistor.

The MP3391 applies 8 internal current sources for current balance. And the current matching can achieve 2.5% regulation accuracy between strings. Its low regulation voltage on LED current sources reduces power loss andimproves 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

• 9V to 35V Input Voltage Range
• 10V MOSFET Gate Driver
• Drive Selectable 8, 6 and 4 Strings of LEDs
• Maximum 120mA for Each String
• 2.5% Current Matching Accuracy Between Strings
• Programmable Switching Frequency
• PWM or DC Input Burst PWM Dimming
• Open/Short protection and Fault Flag Output
• Programmable Short Protection Voltage and Time Threshold
• Programmable Over-voltage Protection
• Flexible Extendable LED ChannelsApplication
• Thermal Shutdown
• 28-pin TSSOP and 28-pin SOIC Package

Typical applications

• Monitors
• Flat Panel Video Displays
• Desktop LCD Flat Panel Displays
• LCD TVs

More information

• Datasheet
• IC product information