MP3387L 3-26V, 20kHz White LED Driver QFN24

MP3387L 3-26V, 20kHz White LED Driver QFN24

The MP3387L is a step-up converter with 6- channel current sources.

Key Specifications

Features

• 6-String, Max 45mA/String
• 3V to 26V Input Voltage Range
• 3% Current Matching Accuracy Between Strings
• Programmable Switching Frequency
• Selectable Combined Analog and PWM Dimming Mode or Pure PWM Dimming Mode
• Combined Analog and PWM Dimming Mode with 25% Dimming Transfer Point
• 24kHz to 27.5kHz Output Dimming Frequency to eliminate audible noise
• Programmable Over-Voltage Protection
• Recoverable Thermal Shutdown Protection
• Cycle by Cycle Over Current Protection

Typical Application Circuit

Applications

• Notebook PC
• Small LCD TV
• Handy Terminals Display

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