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MIC4833

Inductor Based Dual Lamp EL Driver

Status: In Production

Features:

  • Drives two EL panels, up to 4in² each at full brightness
  • Independent input control for each of the two panels and allows PWM dimming.
  • 220VPP regulated AC output waveform
  • 2.3V to 5.8V 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
  • 0.1µA typical shutdown current
  • -40°C to +125°C junction temperature range
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Overview
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Development Environment
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RoHS Information
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Device Overview

Summary

The MIC4833 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 2.3V to 5.8V, 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.

Additional Features
    • Drives two EL panels, up to 4in² each at full brightness
    • Independent input control for each of the two panels and allows PWM dimming.
    • 220VPP regulated AC output waveform
    • 2.3V to 5.8V 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
    • 0.1µA typical shutdown current
    • -40°C to +125°C junction temperature range
Parametrics
Name
Value
Type
Dual Lamp Drivers
Input Voltage Low (V)
2.3
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)
4.0
Package
12/VDFN
Product Type
Electroluminescent Drivers
Frequency (EL, Typical)
175Hz - 295Hz, 445Hz - 685Hz
Θja (C/W)
60
VOUT
220

Documents

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Data Sheets

11/09/2015
1152KB

Development tools data is currently unavailable.

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
MIC4833YML-TR
0.023840
0.644302
12
VDFN
3x3x0.9mm
NiPdAu
e4
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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