MAX14514 データシートの表示（PDF） - Maxim Integrated

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MAX14514

Dual Electroluminescent Lamp Driver

Maxim Integrated 

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MAX14514

EVALUATION KIT AVAILABLE

Dual Electroluminescent Lamp Driver

General 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 con-

verter to generate the high voltage necessary to drive EL

lamps and allows the use of a 220µH inductor to effec-

tively 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 tempera-

ture 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.

Applications

●● I Keypad Backlighting

●● LCD Backlighting

●● PDAs/Smartphones

Benefits and 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

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX14514ETD+ -40°C to +85°C

14 TDFN-EP*

+Denotes lead(Pb)-free/RoHS-compliant package.

*EP = Exposed paddle.

Pin Configuration

TOP VIEW

14 13 12 11 10 9 8

MAX14514

+

*EP

1234567

TDFN-EP

(3mm x 3mm)

*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED.

19-4466; Rev 2; 9/18

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