Low Input Voltage Electronic components BOM Integrated circuit IC MIC4827YMM

Product Descriptions

The MIC4827 is a high output voltage, DC to AC converter, designed for driving EL (Electroluminescent) lamps. The device operates from an input voltage range of 1.8V to 5.5V, making it suitable for 1-cell Li Ion and 2-cell or 3-cell alkaline/NiCad/NiMH battery applications. The MIC4827 converts a low voltage DC input to a 180 VPP AC output signal that drives the EL lamp.

The MIC4827 is comprised of two stages: a boost stage, and an H-bridge, lamp driver, stage. The boost stage steps the input voltage up to +90V. The H-bridge stage then alternately switches the +90V output to each terminal of the EL lamp, thus creating a 180 VPP AC signal to drive the EL lamp and generate light.

The MIC4827 features separate oscillators for the boost and H-bridge stages. External resistors independently set the operating frequency of each stage. This flexibility allows the EL lamp circuit to be optimized for maximum efficiency and brightness.

The MIC4827 uses a single inductor and a minimum number of external components, making it ideal for portable, space sensitive applications.

The MIC4827 is available in an 8-lead MSOP package with an ambient temperature range of –40°C to +85°C.

Product Features

• 1.8V to 5.5V DC Input Voltage

• 180 VPP Regulated AC Output Waveform

• Independently Adjustable EL Lamp Frequency

• Independently Adjustable Boost Converter Frequency

• 0.1 µA Shutdown Current

Product Applications

• LCD Panel Backlight

• Cellular Phones

• PDAs

• Pagers

• Calculators

• Remote Controls

• Portable Phones

Specifications

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