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Dual Electroluminescent Lamp Driver

Industry's Most Flexible Dual EL Driver for Efficient and Bright Backlighting

Product Details

Key Features

Parametric specs for ElectroLuminescent Drivers
Topology Inductor Based
# EL Lamps (max) 2
VIN (V) (min) 2.7
VPP (V) (nom) 300
ESD Protect. (±kV) 15
Dimming Control Analog
PWM
Resistor
Soft Start Yes
Package/Pins TDFN/14
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
4.31
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Simplified Block Diagram

Technical Docs

Data Sheet Dual Electroluminescent Lamp Driver Jan 03, 2019

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Sampling:
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Parameters

Parametric specs for ElectroLuminescent Drivers
Topology Inductor Based
# EL Lamps (max) 2
VIN (V) (min) 2.7
VPP (V) (nom) 300
ESD Protect. (±kV) 15
Dimming Control Analog
PWM
Resistor
Soft Start Yes
Package/Pins TDFN/14
Oper. Temp. (°C) -40 to +85
Budgetary
Price (See Notes)
4.31

Key Features

  • Dual ±15kV ESD-Protected EL Lamp Outputs
  • 300VP-P Maximum Output for Highest Brightness
  • +2.7V to +5.5V Input Voltage Range
  • Resistor Adjustable Slew-Rate Control
  • Resistor Adjustable Lamp and Switching Converter Frequencies
  • DIM Input for Controlling Output Voltage Through DC Analog Voltage, PWM, or Resistor to GND
  • Capacitor Adjustable Soft Turn-On/Off
  • Low 150nA Shutdown Current
  • Thermal Shutdown
  • Space-Saving, 14-Pin, 3mm x 3mm TDFN Package

Applications/Uses

  • Keypad Backlighting
  • LCD Backlighting
  • PDAs/Smartphones

Description

The MAX14514 is a high-voltage DC-AC converter ideal for driving two electroluminescent (EL) lamps. The MAX14514 features a +2.7V to +5.5V input range that allows the device to accept a wide variety of voltage sources, including single-cell lithium-ion (Li+) batteries. The lamp outputs of the device generate up to 300VP-P for maximum lamp brightness.

The MAX14514 utilizes an inductor-based boost converter to generate the high voltage necessary to drive EL lamps and allows the use of a 220µH inductor to effectively drive total combined lamp sizes of up to 20nF.

The MAX14514 uses a high-voltage full-bridge output stage to convert the high voltage generated by the boost converter to an AC waveform suitable for driving the EL panels. An external resistor controls the slew-rate of the rising and falling edges of the AC drive waveform to reduce audible noise output. The high-voltage outputs are ESD protected up to ±15kV Human Body Model, ±4kV IEC 61000-4-2 Air Gap Discharge, and ±4kV IEC 61000-4-2 Contact Discharge.

The MAX14514 features dimming/enable controls (DIM1, DIM2) for each output to allow the user to set the peak-to-peak output voltage with a PWM signal, a DC analog voltage, or a resistor connected from DIM_ to GND. The MAX14514 also provides a slow turn-on/-off feature that slowly ramps the output voltage applied to the lamp when enabled or disabled.

The MAX14514 enters a low-power shutdown mode when the EN and DIM_ inputs are connected to GND. The device also features thermal shutdown if the die temperature exceeds +158°C (typ).

The MAX14514 is available in a space-saving, 14-pin, 3mm x 3mm TDFN package and is specified over the extended -40°C to +85°C operating temperature range.

Simplified Block Diagram

MAX14514: Typical Application Circuit MAX14514: Typical Application Circuit Zoom icon

Technical Docs

Data Sheet Dual Electroluminescent Lamp Driver Jan 03, 2019

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .

Sampling:
Selecting the Sample button above will redirect to the third-party ADI Sample Site. The part selected will carry over to your cart on this site once logged in. Please create a new account there if you have never used the site before. Contact SampleSupport@analog.com with any questions regarding this Sample Site.