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MAX14521EETG

Quad, High-Voltage EL Lamp Driver with I2C Interface

Maxim Integrated 

Quad, High-Voltage EL Lamp Driver

with I2C Interface

Pin Description

PIN

1

2, 4, 16, 18,

20, 22, 24

3

5

6

7

8

9

10

11

12

13

14

15

17

19

21

23

—

NAME

EL1

N.C.

CS

LX

PGND

A0

A1

VDD

SDA

SCL

RB

AUX

I.C.

GND

EL4

EL3

COM

EL2

EP

FUNCTION

High-Voltage EL Panel Output 1. Connect EL1 to segment 1 of the EL lamp.

No Connection. Not internally connected.

Feedback Connection. Connect CS to the output of the boost converter (cathode of the rectifying diode).

Internal Switching DMOS Drain Connection. Connect LX to the middle terminal of the tapped inductor.

Power Ground. Connect to GND.

Address Input 0. Address inputs allow up to four connections on one common bus. Connect A0 to

GND or VDD.

Address Input 1. Address inputs allow up to four connections on one common bus. Connect A1 to

GND or VDD.

Input Supply Voltage

Open-Drain, Serial Data Input/Output. SDA requires an external pullup resistor.

Serial-Clock Input. SCL requires an external pullup resistor.

Reset Input. Drive RB low to clear all registers to zero and put the device into a low-power shutdown

mode. The device does not respond to I2C communications when RB is held low.

Audio Effects Input. Modulates amplitude/frequency of the EL output with the AUX input voltage amplitude.

Internally Connected. Connect I.C. to GND.

Ground

High-Voltage EL Panel Output 4. Connect EL4 to segment 4 of the EL lamp.

High-Voltage EL Panel Output 3. Connect EL3 to segment 3 of the EL lamp.

High-Voltage COM Output. Connect COM to common terminal of the EL lamp.

High-Voltage EL Panel Output 2. Connect EL2 to segment 2 of the EL lamp.

Exposed Pad. Connect EP to GND.

Detailed Description

The MAX14521E is a quad-output high-voltage DC-AC

converter that drives four EL lamps. The device fea-

tures a 2.7V to 5.5V input range that allows the device

to accept a variety of sources such as single-cell Li+

batteries. The lamp outputs of the device generate up

to 300VP-P for maximum lamp brightness.

The MAX14521E utilizes a high-frequency spread-

spectrum boost converter that reduces the amount of

EMI/EFI generated by the circuit. The boost-converter

switching frequency is set with an 8-bit register through

the I2C interface. The MAX14521E uses a high-voltage

full-bridge output stage to convert the high voltage gen-

erated by the boost converter to an AC waveform suit-

able for driving an EL lamp. An internal register

controlled through the I2C interface sets the shape of

the EL output waveshape.

The EL output switching frequency for all outputs is set

with an 8-bit register through the I2C interface. The

MAX14521E provides a serial digital interface that

allows the user to set the peak voltage of each output

independently with 5 bits of resolution. The MAX14521E

also provides an adjustable automatic ramping feature

that slowly increases or decreases the peak output volt-

age when the set value is changed. The slew rate of the

ramp is set with 3 bits of resolution through the I2C

interface and it is independent for each channel. The

MAX14521E features an audio auxiliary input AUX that

modulates the EL output voltage and frequency for

dynamic lighting effects.

The high-voltage outputs are ESD protected up to

±15kV Human Body Model, ±8kV Air Gap Discharge,

and ±6kV Contact Discharge, as specified in

IEC 61000-4-2.

8 _______________________________________________________________________________________

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