MP3308 3.3V, 2.2MHz Step-up White LED Driver QFN14

MP3308 3.3V, 2.2MHz Step-up White LED Driver QFN14

The MP3308 is a monolithic step-up converter designed to drive arrays of white LEDs from a 3.3V input or a single-cell lithium-ion battery.

Key Specifications

Features

• Internal Power MOSFET
• Drives Up to 10 White LEDs in Series
• 2.2MHz Fixed Switching Frequency
• Up to 88% Efficiency
• Dual PWM-Dimming Input Control
• Internal 1.3A Current Limit
• ±3% True PWM Dimming Duty Accuracy
• Adjustable Over-Voltage Protection Threshold
• Low 200mV Feedback Voltage
• Under-Voltage Lockout, Short-Circuit Protection, Thermal Shutdown

Typical Application Circuit

Applications

• Small LCD Panels
• Digital Picture Frames
• Smartphones
• Portable Media Players

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