MAX14521E 查看數據表（PDF） - Maxim Integrated

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MAX14521E

Quad, High-Voltage EL Lamp Driver with I2C Interface

Maxim Integrated 

19-4477; Rev 0; 2/09

EVAALVUAAILTAIOBNLEKIT

Quad, High-Voltage EL Lamp Driver

with I2C Interface

General Description

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

converter that drives four electroluminescent (EL)

lamps. The device features a 2.7V to 5.5V input range

that allows the device to accept a variety of voltage

sources such as single-cell lithium-ion (Li+) batteries.

The lamp outputs of the device generate up to 300VP-P

for maximum lamp brightness. The high-voltage outputs

are ESD protected up to ±15kV Human Body Model

(HBM), ±6kV Contact Discharge, and ±8kV Air Gap

Discharge, as specified in IEC 61000-4-2.

The MAX14521E uses a high-voltage full-bridge output

stage to convert the high voltage generated by the

boost converter to a sinusoidal output waveform. The

MAX14521E utilizes a high-frequency spread-spectrum

oscillator to reduce the amount of EMI/EFI generated by

the boost-converter circuit.

The MAX14521E provides an I2C interface to set the

boost converter and EL output switching frequencies

through an 8-bit register and the peak output voltages

with 5 bits of resolution. The MAX14521E also provides

an adjustable automatic ramping feature that slowly

increases or decreases the peak output voltage when a

change is made to the output amplitude. The slew rate

of the automatic 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 fre-

quency for dynamic lighting effects.

The MAX14521E is available in a small, 4mm x 4mm,

24-pin TQFN package, and specified over the extend-

ed -40°C to +85°C operating temperature range.

Applications

Keypad Backlighting

LCD Backlighting

PDAs

Smartphones

Automotive Instruments Clusters

Pin Configuration appears on last page

Features

♦ 300VP-P Maximum Output for Highest Brightness

♦ ESD-Protected EL Lamp Outputs

±15kV Human Body Model

±6kV IEC 61000-4-2 Contact ESD Protection

±8kV IEC 61000-4-2 Air Gap Discharge

♦ 2.7V to 5.5V Input Voltage Range

♦ I2C Interface for Control of Brightness, EL

Frequency, Boost Frequency, Shape

♦ Sinusoidal Output for Low Audible Noise

♦ Individual Dimming Control

♦ Individually Adjustable Output Brightness

Ramping Rate

♦ ±3% EL Output Frequency Accuracy for Truest EL

Panel Color

♦ Audio Input for Dynamic Lighting Effects

♦ Spread-Spectrum Boost Converter

♦ 100nA Shutdown Current

♦ Space-Saving, 4mm x 4mm, 24-Pin TQFN Package

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX14521EETG+ -40°C to +85°C

24 TQFN-EP*

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

*EP = Exposed pad.

Typical Operating Circuit

VBAT

10μF

CSN

330pF

LX

D

RSN

CCS

20Ω

TO BASEBAND/PMIC

3

CS

6

PGND

5

LX

10

SDA

11

SCL

7

A0

8

A1

12

RB

VDD

9

VDD

MAX14521E

GND

15

0.1μF

EL LAMP1

1

EL1

EL LAMP1

23

EL2

EL LAMP1

19

EL3

EL LAMP1

17

EL4

21

COM

13

AUX

AUDIO

LINE-IN

________________________________________________________________ Maxim Integrated Products 1

For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

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