Microchip | MIC4833YML-TR

The MIC4833YML TR is a low noise dual Electroluminescent (EL) Panel driver used in backlighting applications. The MIC4833 converts a low DC voltage to a high DC voltage using a boost converter and then alternates the high DC voltage across the EL panels using an H-bridge.

The MIC4833 incorporates internal wave-shaping circuitry specifically designed to reduce audible noise emitted by EL panels. The two EL panels may be dimmed by applying a PWM signal to the device. The MIC4833 drives two outputs from a single inductor and requires a minimum number of passive components. It features an operating input voltage range of 2.3 V to 5.8 V, making it suitable for 1-cell Li-ion and 2- or 3-cell alkaline/NiCad/NiMH battery applications. An external resistor may be used to adjust the output voltage slew rate to reduce audible noise. The MIC4833 features separate oscillators for the boost and H-bridge stages to allow independent control. External resistors set the operating frequencies of each stage allowing the EL circuit to optimize efficiency and brightness. The MIC4833 is available in a 12 pin 3 mm x 3 mm MLF ® package, and has an operating junction temperature range of –40° C to +125° C.

Key Features:

• Drives two EL panels, up to 4 in2  each at full brightness.
• Independent input control for each of the two panels and allows PWM dimming.
• 220 Vpp regulated AC output waveform.
• 2.3 V to 5.8 V DC input voltage.
• Wave-shaping circuit to reduce audible noise.
• Adjustable slew rate for audible noise reduction.
• Independently adjustable boost converter and EL panel frequency.
• Single inductor to power both panels.
• 0.1 uA typical shutdown current.
• 12 pin 3 mm x 3 mm MLF ® package.
• –40 oC to +125 oC junction temperature range.

Applications:

• Mobile Phones.
• MP3s/Portable Media Players (PMP).
• Clocks/ Watches.
• Remote Controls.
• Cordless Phones.
• GPS Device.
• PDAs.