MP7235 3A, 2.2MHz Synchronous Buck Infrared Radiation LED Driver QFN-13

MP7235 3A, 2.2MHz Synchronous Buck Infrared Radiation LED Driver QFN-13

The MP7235 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
• Additional Features: o FCCM o Internal Soft Start (SS) o Available in a QFN-13 (2.5mmx3mm) Package o Available in a Wettable Flank Package o CISPR25 Class 5 Compliant

Typical Application Circuit

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