MP3398A 5-28V White LED Controller SOIC16

MP3398A 5-28V White LED Controller SOIC16

The MP3398A is a step-up controller with 4 current channels, which is designed to drive WLED arrays for large-size LCD-panel backlighting applications.

Key Specifications

Features

• 4-String, Max 350mA/String WLED Driver
• 5V to 28V Input Voltage Range
• 2.5% Current Matching Accuracy Between Strings
• Programmable Switching Frequency
• PWM and Analog Dimming Mode
• Cascading Capability with a Single Power Source
• LED Open and Short LED Protection
• Programmable Over-Voltage Protection
• Recoverable Thermal Shutdown Protection
• Over Current Protection

Typical Application Circuit

Applications

• Desktop LCD Flat Panel Displays
• Flat Panel Video Displays

Design Notes

• Channel-to-channel current matching sets backlight uniformity; check the matching spec at the current you will actually run.
• In boost topologies the OVP threshold must clear the worst-case forward voltage of the longest string, including temperature and binning spread.
• Keep PWM dimming above 200 Hz to stay clear of visible flicker, and away from the audio band if the product has a speaker.
• Size the inductor and output capacitor for the string current ripple, not the total LED current.

Common Questions