MPQ7231 6-42V, 3A Synchronous Infrared LED Driver QFN-19

MPQ7231 6-42V, 3A Synchronous Infrared LED Driver QFN-19

The MPQ7231 is a fixed-frequency, constant current, infrared (IR) LED driver with integrated eye safety features.

Key Specifications

Features

• Built for Infrared (IR) LED Applications: o 10Hz to 2kHz Pulse-Width Modulation (PWM) Dimming Frequency o Compatible with 30fps, 60fps, and 120fps Dimming
• Improved Efficiency and Thermals: o Integrated Current-Sense Resistor o 44mΩ/40mΩ On Resistance (RDS(ON)) Internal MOSFETs
• Optimized for EMC/EMI: o 2.4MHz (Buck) or 1.25MHz (Buck- Boost) Switching Frequency (fSW) with Frequency Spread Spectrum (FSS) o EMI Reduction Techniques
• Functional Safety: o Eye Safety Features Include:
• LED Current Limit

Typical Application Circuit

Applications

• Driver Monitoring Systems (DMS)
• IR Illumination for Automotive Cameras

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