Microchip | MIC4812YMME

The MIC4812 series of high efficiency linear White LED (WLED) driver designed to drive up to six high current WLEDs for signage lighting. The MIC4812 provides the highest possible efficiency as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. The MIC4812 provides six linear drivers which maintain constant current for up to six WLEDs. It features a typical dropout of 190 mV at 100 mA.

The MIC4812 features Dynamic Average Matching? (DAM?) which is specifically designed to provide optimum matching across all WLEDs. The high accuracy (±1% typical) current regulated WLED channels ensure uniform display illumination under all conditions. The brightness is controlled through an Ultra Fast PWM? interface operating down to less than 1% duty cycle. The MIC4812 is available in an 10-pin MSOP ePad package with a junction temperature range of –40°C to +125°C.

Features:

• High Efficiency (no Voltage Boost losses)
• Ultra Fast PWM? control (200 Hz to 500 kHz)
• Input voltage range: 3.0 V to 5.5 V
• LED current range up to 100 mA per channel
• Programmable LED current with external resistor
• Dropout of 190 mV at 100 mA
• Matching better than ±1% (typical)
• Current Accuracy better than ±1% (typical)
• Maintains proper regulation regardless of how many channels are utilized
• 10-pin MSOP with ePad package

Applications:

• Billboard displays
• Marquee displays
• Instrument displays
• LCD display modules