MIC4834

MIC4834 Low Noise Dual 220 VPP EL Driver General Description The MIC4834 is a low noise dual Electroluminescent (EL) Panel driver used in backlighting applications. The MIC4834 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 MIC4834 incorporates internal wave-shaping circuitry specifically designed to reduce audible noise emitted by EL panels. With only one inductor the MIC4834 can drive two outputs and requires a minimum number of passive components. It features an operating input voltage range of 2.3V to 5.8V, making it suitable for 1-cell Li-ion and 2- or 3-cell alkaline/NiCad/NiMH battery applications. The MIC4834 features separate oscillators for the boost and H-bridge stages. The boost frequency may be adjusted with an external resistor to optimize efficiency and brightness. The H-bridge frequency is internally preset to 225Hz, to reduce the number of external components and layout space. The MIC4834 is available in 10 pin 3mmx3mm MLF® package as well as MSOP-10L, and has an operating junction temperature range of –40°C to +125°C. Features Drives two EL panels, up to 3 in2 each at full brightness 220VPP regulated AC output waveform 2.3V to 5.8V DC input voltage Wave-shaping circuit to reduce audible noise Adjustable boost converter frequency Single inductor to power both panels 0.1µA typical shutdown current Package options − 10-pin 3mmx3mm MLF®...