MPQ7235-AEC1 3A, 2.2MHz Synchronous Buck Automotive IR LED Driver QFN-13

MPQ7235-AEC1 3A, 2.2MHz Synchronous Buck Automotive IR LED Driver QFN-13

The MPQ7235 is a high-frequency, synchronous, rectified, step-down, switch-mode LED driver with integrated power MOSFETs.

Key Specifications

Features

• High Performance for Improved Thermals: o 85mΩ/50mΩ Low RDS(ON) Internal Power MOSFETs o 0.2V Reference Voltage (VREF) o High-Efficiency Synchronous Mode Operation
• Optimized for EMC and EMI: o Default 2.2MHz Switching Frequency (fSW) o EMI Reduction Techniques
• Full Protection Features: o LED Short and Open Fault Indication o OCP with Valley Current Detection o Thermal Shutdown

Typical Application Circuit

Applications

• Infrared (IR) LED Drivers for 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