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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 300V

P-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-volt-

age 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.

Applications

Keypad Backlighting

LCD Backlighting

PDAs/Smartphones

Automotive Instrument Clusters

Features

♦ Dual ±15kV ESD-Protected EL Lamp Outputs

♦ 300V

P-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

MAX14514

Dual Electroluminescent Lamp Driver

________________________________________________________________

Maxim Integrated Products

Pin Configuration

19-4466; Rev 0; 2/09

EVALUATION KIT

AVAILABLE

PART TEMP RANGE PIN-PACKAGE

MAX14514ETD+ -40°C to +85°C 14 TDFN-EP*

Ordering Information

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

EP = Exposed pad.

MAX14514

TDFN-EP

(3mm x 3mm)

TOP VIEW

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

245

13 11 10

COM

DIM2

SLEWDIM1

CAP

CSV

LXGND

*EP

For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.

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MAX14514 1

Resumo do Conteúdo

Página 1 - MAX14514

General DescriptionThe MAX14514 is a high-voltage DC-AC converter idealfor driving two electroluminescent (EL) lamps. TheMAX14514 features a +2.7V to

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MAX14514Detailed DescriptionThe MAX14514 high-voltage DC-AC converter isdesigned to drive two EL lamps. The MAX14514 fea-tures a +2.7V to 5.5V input r

Página 3

The MAX14514 boost converter frequency uses aninternal switch oscillator to set the desired frequency ofthe boost converter. The boost converter frequ

Página 4

MAX14514Design ProcedureLX Inductor SelectionThe recommended inductor values are 220µH/330µH.For most applications, series resistance (DCR) shouldbe b

Página 5

RSLEWResistor SelectionTo help reduce audible noise emission by the ELlamps, the MAX14514 features a slew-rate controlinput (SLEW) that allows the use

Página 6

MAX14514Dual Electroluminescent Lamp DriverMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Max

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MAX14514Dual Electroluminescent Lamp Driver2 _______________________________________________________________________________________Typical Applicatio

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MAX14514Dual Electroluminescent Lamp Driver_______________________________________________________________________________________ 3ABSOLUTE MAXIMUM R

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MAX14514Dual Electroluminescent Lamp Driver4 _______________________________________________________________________________________ELECTRICAL CHARACT

Página 10

MAX14514Dual Electroluminescent Lamp Driver_______________________________________________________________________________________ 5TOTAL INPUT CURREN

Página 11

MAX14514Dual Electroluminescent Lamp Driver6 _______________________________________________________________________________________Typical Operating

Página 12

MAX14514Dual Electroluminescent Lamp Driver_______________________________________________________________________________________ 7BOOST CONVERTER FR

Página 13

MAX14514Dual Electroluminescent Lamp Driver8 _______________________________________________________________________________________Pin DescriptionPIN

Página 14

MAX14514Dual Electroluminescent Lamp Driver_______________________________________________________________________________________ 9Functional Diagram

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Rainbow-electronics MAX14514 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Software Rainbow-electronics MAX14514. Rainbow Electronics MAX14514 User Manual Manual do Utilizador

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