EVALUATION KIT AVAILABLE

MAX14521E

Quad, High-Voltage EL Lamp Driver

with I

2

C 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 300V

P-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 I

2

C 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 I

2

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

24-pin TQFN package, and specified over the extended

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

Benefits and Features

●

Integration Reduces Required Board Space

• Integrated ±15kV ESD Protection

• Low Number of Needed Discrete Components

• 4mm x 4mm, 24-Pin TQFN Package

●

Enhances Lamp Performance

• 300V

P-P

Maximum Output for Highest Brightness

• ±3% EL Output Frequency Accuracy for Truest EL

Panel Color

• Individually Adjustable Output Brightness Ramping

Rate and Individual Dimming Control

• Audio Input for Dynamic Lighting Effects

• I²C Interface for Control of Brightness, EL Frequency,

Boost Frequency, Shape

●

Eases System Integration

• Sinusoidal Output for Low Audible Noise

• High-Frequency Spread-Spectrum Oscillator

Reduces EMI/EFI Generation

●

Ideal for Battery-Powered Devices

• 100nA Shutdown Current

• 2.7V to 5.5V Input Voltage Range

Pin Configuration

appears on last page.

Typical Operating Circuit

V

DD

0.1µF

V

BAT

L

X

R

SN

20Ω

D

C

CS

9

3

6

5

10

TO BASEBAND/PMIC

11

7

8

12

CS

PGND

LX

SDA

SCL

A0

A1

RB

GND

15

V

DD

EL1

EL2

EL3

EL4

COM

AUX

1

23

19

17

21

13

AUDIO

LINE-IN

EL LAMP1

Applications

●

Keypad Backlighting

LCD Backlighting

PDAs

Smartphones

10µF

C

SN

330pF

MAX14521E

Ordering Information

PART

TEMP RANGE

PIN-PACKAGE

MAX14521EETG+

-40°C to +85°C

24 TQFN-EP*

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

*EP = Exposed pad.

19-4477; Rev 2; 1/15

MAX14521E

Quad, High-Voltage EL Lamp Driver

with I

2

C Interface

Absolute Maximum Ratings

(All voltages referenced to GND, unless otherwise noted.)

V

DD

.......................................................................-0.3V to +6.0V

CS, EL1, EL2, EL3, EL4, COM ...........................-0.3V to +160V

LX ..........................................................................-0.3V to +33V

RB, A0, A1, AUX...................................................-0.3V to +6.0V

SCL, SDA ................................................. -0.3V to (V

DD

+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

24-Pin TQFN-EP (derate 27.8mW/°C above +70°C) ....2222mW

Package Junction-to-Ambient Thermal Resistance (θ

JA

)

(Note 1) .......................................................................36°C/W

Package Junction-to-Case Thermal Resistance (θ

JC

)

(Note 1)..........................................................................3°C/W

Operating Temperature Range ........................... -40°C to +85°C

Storage Temperature Range ............................ -65°C to +150°C

Junction Temperature ......................................................+150°C

Lead Temperature (soldering, 10s) ................................. +300°C

Note 1:

Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer

board. For detailed information on package thermal considerations, refer to

www.maximintegrated.com/thermal-tutorial.

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these

or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect

device reliability.

Electrical Characteristics

(V

DD

= +2.7V to +5.5V, total C

LAMP

= 10nF, C

CS

= 3.3nF, tapped inductor = 2.3μH/115μH, 1:7 ratio (I

SAT

= 0.7A, R

S

= 1Ω), T

A

= -40°C

to +85°C, unless otherwise noted. Typical values are at T

A

= +25°C and V

DD

= 3.7V.) (Note 2)

PARAMETER

Input Voltage

Battery Voltage

Input Supply Current

SYMBOL

V

DD

V

BAT

I

DD

(Note 3)

All channels on, 300V

P-P

, f

EL

= 200Hz,

sinewave output shape

RB, A0, A1 = 0V or V

DD

;

SCL = SDA = GND or

V

DD

; not toggling

T

A

= +25°C

T

A

= -40°C

to +85°C

350

25

CONDITIONS

MIN

2.7

TYP

MAX

5.5

13.2

900

100

300

2100

V

DD

rising

1.6

2.0

70

V

EL_

-V

COM

; EL_ _[4:0] = 01000; V

DD

= 3.7V

Peak-to-Peak Output Voltage

Max Average Output Voltage

EL_ High-Side Switch

On-Resistance

EL_ Low-Side Switch

On-Resistance

COM High-Side Switch

On-Resistance

COM Low-Side Switch

On-Resistance

V

P-P

V

AVG

R

ONHS_EL_

R

ONLS_EL_

R

ONHS_COM

R

ONHS_COM

V

EL_

-V

COM

; EL_ _[4:0] = 10000; V

DD

= 3.7V

V

EL_

-V

COM

; EL_ _[4:0] = 11111; V

DD

= 3.7V

V

EL_

- V

COM

66

136

268

78

154

300

1

1270

700

390

175

90

172

320

V

Ω

V

2.5

nA

UNITS

V

µA

Shutdown Supply Current

Shutdown Tapped-Inductor

Supply Current

Undervoltage Lockout

UVLO Hysteresis

EL OUTPUTS (EL_, COM)

I

SHDN

I

LX_SHDN

V

UV

V

UV_HYST

nA

V

mV

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Maxim Integrated

│

2

MAX14521E

Quad, High-Voltage EL Lamp Driver

with I

2

C Interface

Electrical Characteristics (continued)

(V

DD

= +2.7V to +5.5V, total C

LAMP

= 10nF, C

CS

= 3.3nF, tapped inductor = 2.3μH/115μH, 1:7 ratio (I

SAT

= 0.7A, R

S

= 1Ω), T

A

= -40°C

to +85°C, unless otherwise noted. Typical values are at T

A

= +25°C and V

DD

= 3.7V.) (Note 2)

PARAMETER

EL_ High-Side Switch Off-

Leakage

EL_ Low-Side Switch Off-

Leakage

COM High-Side Switch Off-

Leakage

COM Low-Side Switch Off-

Leakage

SYMBOL

I

LKGHS_EL_

I

LKGLS_EL_

I

LKGHS COM_

I

LKGLS COM_

f

EL_LR

f

EL_HR

BOOST CONVERTER

EL_ _[4:0] = 01000; V

DD

= 3.7V

Peak Output Voltage

V

CS

EL_ _[4:0] = 10000; V

DD

= 3.7V

EL_ _[4:0] = 11111; V

DD

= 3.7V

FSW[4:0] = 10000

Tapped-Inductor Center

Switching Frequency

Tapped-Inductor Switching

Frequency Spreading Factor

Tapped-Inductor Switching

Frequency Modulation Frequency

Switch On-Resistance

LX Current

CS Input Current

CONTROL INPUT AUX

Input Range

Input Capacitance

CONTROL INPUT RB

Input Logic-Low Voltage

Input Logic-High Voltage

Input Hysteresis

Input Leakage Current

Input Capacitance

Input Logic-Low Voltage

Input Logic-High Voltage

Input Hysteresis

f

SW

FSW[4:0] = 10000

FSW[4:0] = 00000 (default)

FSW[4:0] = 01111

S

F

f

M

R

LX

I

CS

AUX

RNG

AUX

CAP

V

IL_RB

I

LX

SS[1:0] = 01, 10, or 11

SS[1:0] = 11

I

SINK

= 25mA, V

DD

= 3.7V

V

LX

= 30V

No load, V

CS

= 150V

0

10

-1

33

68

134

39

77

150

400

800

1600

8

f

SW

/128

3

+10

27

V

DD

%

kHz

Ω

μA

V

pF

V

130

V

RB

= 5.5V or 0

-1

10

0.5

1.5

130

+1

mV

μA

pF

V

mV

kHz

45

86

160

V

FEL[7:0] = 1000

0000; V

DD

= 3.7V

FEL[7:0] = 1011

1111; V

DD

= 3.7V

T

A

= +25°C

T

A

= +25°C

T

A

= -40°C to +85°F

T

A

= -40°C to +85°F

CONDITIONS

MIN

-1

194

186

388

376

200

400

TYP

MAX

+1

206

212

412

424

Hz

UNITS

μA

EL Lamp Switching Frequency

0.5

1.5

I

HYS_RB

I

LKG_RB

C

IN

V

IL

V

IH_RB

I

2

C INTERFACE LOGIC (SDA, SCL, A1, AND A0) (Figure 1)

V

IH

I

HYS

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Maxim Integrated

│

3

MAX14521E

Quad, High-Voltage EL Lamp Driver

with I

2

C Interface

Electrical Characteristics (continued)

(V

DD

= +2.7V to +5.5V, total C

LAMP

= 10nF, C

CS

= 3.3nF, tapped inductor = 2.3μH/115μH, 1:7 ratio (I

SAT

= 0.7A, R

S

= 1Ω), T

A

= -40°C

to +85°C, unless otherwise noted. Typical values are at T

A

= +25°C and V

DD

= 3.7V.) (Note 2)

PARAMETER

Input Leakage Current

Output Low Voltage

Input/Output Capacitance

Serial-Clock Frequency

Clock Low Period

Clock High Period

Bus Free Time

START Setup Time

START Hold Time

STOP Setup Time

Data In Setup Time

Data In Hold Time

Receive SCL/SDA Minimum

Rise Time

Receive SCL/SDA Maximum

Rise Time

Receive SCL/SDA Minimum

Fall Time

Receive SCL/SDA Maximum

Fall Time

Transmit SDA Fall Time

SCL/SDA Noise Suppression

Time

ESD PROTECTION

EL_, COM

THERMAL PROTECTION

Thermal Shutdown

Thermal Shutdown Hysteresis

T

SHDN

T

HYST

160

12

°C

SYMBOL

I

LKG

C

I/O

f

SCL

t

LOW

t

HIGH

t

BUF

t

SU,STA

t

HD,STA

t

SU,STO

t

SU,DAT

t

HD,DAT

t

R

t

R

t

F

t

F

t

F

t

I

Human Body Model

IEC 61000-4-2 Contact Discharge

IEC 61000-4-2 Air Gap Discharge

C

B

= 400pF

20 +

0.1C

B

50

±15

±6

±8

kV

1.3

0.6

1.3

0.6

100

0

20 + 0.1C

B

300

20 + 0.1C

B

300

900

V

OL

I

SINK

= 3mA

CONDITIONS

MIN

-1

10

400

TYP

MAX

+1

0.4

UNITS

μA

V

pF

kHz

μs

ns

Note 2:

All parameters are 100% production tested at T

A

= +25°C and T

A

= +85°C, unless otherwise noted. Parameters at -40°C

are guaranteed by design.

Note 3:

See the

f

SW

Selection

section when V

BAT

is above 5.5V.

www.maximintegrated.com

Maxim Integrated

│

4

MAX14521E

Quad, High-Voltage EL Lamp Driver

with I

2

C Interface

SDA

t

SU, DAT

t

LOW

SCL

t

HD, STA

START

CONDITION

t

HD, DAT

t

SU, STA

t

HD, STA

t

SU, STO

t

BUF

t

HIGH

t

R

t

F

REPEATED

START CONDITION

STOP

CONDITION

START

CONDITION

Figure 1. I

2

C Timing Specifications

Typical Operating Characteristics

TOTAL INPUT CURRENT

vs. SUPPLY VOLTAGE

MAX14521E toc01

(V

DD

= 3.7V, total C

LAMP

= 10nF, C

CS

= 3.3nF, L

X

= 2.3μH/115μH, 1:7 ratio, (I

SAT

= 0.7A, R

S

= 1Ω), T

A

= +25°C, sine-wave output,

f

SW

= 800kHz, f

EL

= 200Hz, unless otherwise noted.)

TOTAL INPUT CURRENT

vs. TEMPERATURE

MAX14521E toc02

TOTAL INPUT CURRENT (mA)

50

40

30

20

10

0

V

FI

= 300V

P-P

V

FI

= 200V

P-P

V

FI

= 300V

P-P

V

FI

= 300V

P-P

V

FI

= 200V

P-P

60

POINT WHERE SET

V

EL

DECREASES AS

FREQUENCY INCREASES

40

20

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

-40

-15

10

35

60

85

0

400

600

800

1000

1200

1400

1600

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

BOOST CONVERTER FREQUENCY (kHz)

MAX14521E toc04

MAX14521E toc05

TOTAL INPUT CURRENT (mA)

SHUTDOWN CURRENT (nA)

1.5

SHUTDOWN CURRENT (nA)

160

120

80

40

0

V

EL

= 250V

P-P

, f

SW

= 800kHz,

UNLESS OTHERWISE NOTED

V

DD

= 5V

f

SW

= 700kHz

V

DD

= 3.3V

f

SW

= 400kHz

V

EL

= 200V

P-P

10

1

0.5

0

20

40

60

80

0

2.7

3.1

3.5

3.9

4.3

4.7

5.1

5.5

0.1

-40

-15

10

35

60

85

TOTAL COMBINED LOAD (nF)

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

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Maxim Integrated

│

5

MAX14521E toc06

200

TOTAL INPUT CURRENT vs. LOAD

2

SHUTDOWN CURRENT

vs. SUPPLY VOLTAGE

100

SHUTDOWN CURRENT

vs. TEMPERATURE

MAX14521E toc03

60

56

52

48

44

40

36

32

28

24

20

16

12

8

4

0

80

TOTAL INPUT CURRENT

vs. BOOST CONVERTER FREQUENCY

参数名称	属性值
是否Rohs认证	符合
厂商名称	Maxim(美信半导体)
包装说明	,
Reach Compliance Code	compliant
Factory Lead Time	17 weeks
接口集成电路类型	EL DISPLAY DRIVER
峰值回流温度（摄氏度）	NOT SPECIFIED
处于峰值回流温度下的最长时间	NOT SPECIFIED

MAX14521EETG+T

MAX14521EETG+T概述

MAX14521EETG+T规格参数

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