MP3372 3-30V, 8CH Sync-Boost WLED Driver QFN-24

MP3372 3-30V, 8CH Sync-Boost WLED Driver QFN-24

The MP3372 is a synchronous boost converter with eight current channels designed to drive WLED arrays for LCD panels in tablets and notebook backlighting applications.

Key Specifications

Features

• 8 Channels with Maximum 50mA/Channel
• Synchronous Converter with 50V LS- FET/HS-FET with 150m/230mΩ On Resistance
• 3V to 30V Input Voltage Range
• Maximum 2.5% Current Matching
• 350kHz, 500kHz, 650kHz, 800kHz, 950kHz, 1.2MHz, 1.8MHz, or 2.4MHz Selectable Switching Frequency
• A1 Pins for Two I2C Addresses
• 0mA to 50mA Full-Scale LED Current, 8-Bit, 0.196mA/Step
• Selectable Synchronous or Asynchronous Mode
• Phase Shift Function during PWM Dimming (including PWM Dimming during Mixed Dimming Mode)
• Linear Smooth Dimming with 2µs, 4µs, 8µs, 16µs, 32µs, 64µs, or 128µs Step-Slope Set

Typical Application Circuit

Applications

• Tablets/Notebooks

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