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MIC4834

Inductor Based Dual Lamp EL Driver

Status: End of Life

Features:

  • Drives two EL panels, up to 3in² 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 3mm x 3mm MLF®
  • 10-pin MSOP
  • -40°C to +125°C junction temperature range
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Device Overview

Summary

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 3mm x 3mm MLF® package as well as MSOP-10L, and has an operating junction temperature range of -40°C to +125°C.

Please consider this device MIC4833

Additional Features
    • Drives two EL panels, up to 3in² 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 3mm x 3mm MLF®
      • 10-pin MSOP
    • -40°C to +125°C junction temperature range
Parametrics
Name
Value
Type
Dual Lamp Drivers
Input Voltage Low (V)
2.30
Input Voltage High (V)
5.8
Nominal Output Voltage (V)
±110
Max Switch Resistance(Ω)
12.0
Output Regulation
Yes
Max Lamp Size per Device (in2)
3.0
Package
10/MSOP, 10/VDFN
Product Type
Electroluminescent Drivers
Frequency (EL, Typical)
165Hz - 285Hz
Θja (C/W)
206, 60
VOUT
220

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