MP24830 4.5-90V Programmable Frequency White LED Driver SOIC

MP24830 4.5-90V Programmable Frequency White LED Driver SOIC

The MP24830 is a 90V white LED driver suitable for either step-down or inverting step-up/down applications.

Key Specifications

Features

• Programmable Maximum Output Current
• Unique Step-Up/Down Operation (Buck- Boost Mode)
• Wide 4.5V-to-90V Operating Input Range for Step-Down Applications (Buck Mode)
• Adjustable Switching Frequency
• Analog and PWM Dimming
• 0.2V Reference Voltage
• 10μA Shutdown Mode
• No Minimum LED Quantity Required
• Stable with Low ESR Output Ceramic Capacitors
• Cycle-by-Cycle Over-Current Protection

Typical Application Circuit

Applications

• General LED Illumination
• Automotive LED Lighting

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