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MAX14521EETG+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20
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 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
Features
♦ 300V
P-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
♦ I
2
C 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
MAX14521E
Quad, High-Voltage EL Lamp Driver
with I
2
C Interface
________________________________________________________________
Maxim Integrated Products
1
MAX14521E
CS
L
X
D
3
C
CS
0.1μF
PGND
6
LX
5
10μF
C
SN
330pF
V
BAT
R
SN
20Ω
SDA
10
SCL
11
A0
7
A1
8
TO BASEBAND/PMIC
RB
12
15
GND
9
V
DD
1
EL1
EL LAMP1
23
EL2
EL LAMP1
19
EL3
EL LAMP1
17
EL4
EL LAMP1
21
COM
13
AUX
AUDIO
LINE-IN
V
DD
Typical Operating Circuit
19-4477; Rev 0; 2/09
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.
EVALUATION KIT
AVAILABLE
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.
Pin Configuration appears on last page
MAX14521E
Quad, High-Voltage EL Lamp Driver
with I
2
C Interface
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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)
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.
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.maxim-ic.com/thermal-tutorial
.
(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
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
Input Voltage V
DD
2.7 5.5 V
Battery Voltage V
BAT
(Note 3)
13.2
V
Input Supply Current I
DD
All channels on, 300V
P-P
, f
EL
= 200Hz, sine-
wave output shape
350
900 µA
T
A
= +25°C 25 100
Shutdown Supply Current I
SHDN
RB, A0, A1 = 0V or V
DD
;
SCL = SDA = GND or
V
DD
; not toggling
T
A
= -40°C to
+85°C
300
nA
Shutdown Tapped-Inductor
Supply Current
I
LX_SHDN
2100
nA
Undervoltage Lockout V
UV
V
DD
rising 1.6 2.0 2.5 V
UVLO Hysteresis
V
UV_HYST
70 mV
EL OUTPUTS (EL_, COM)
V
E L_
- V
C OM
; E L_ _[ 4:0] = 01000; V
D D
= 3.7V
66 78 90
V
E L_
- V
C OM
; E L_ _[ 4:0] = 10000; V
D D
= 3.7V 136 154
172
Peak-to-Peak Output Voltage V
P-P
V
E L_
- V
C OM
; E L_ _[ 4:0] = 11111; V
D D
= 3.7V 268 300
320
V
Max Average Output Voltage V
AVG
V
EL_
- V
COM
1V
EL_ High-Side Switch
On-Resistance
R
ONHS_EL_
1270
Ω
EL_ Low-Side Switch
On-Resistance
R
ONLS_EL_
700
Ω
COM High-Side Switch
On-Resistance
R
ON HS_COM
390
Ω
COM Low-Side Switch
On-Resistance
R
ON LS _C OM
175
Ω
MAX14521E
Quad, High-Voltage EL Lamp Driver
with I
2
C Interface
_______________________________________________________________________________________ 3
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
EL_ High-Side Switch Off-
Leakage
I
LKGHS_EL_
-1 +1 µA
EL_ Low-Side Switch Off-
Leakage
I
LKGLS_EL_
-1 +1 µA
COM High-Side Switch Off-
Leakage
I
LKGHS _COM
-1 +1 µA
COM Low-Side Switch Off-
Leakage
I
LKGLS _COM
-1 +1 µA
T
A
= +25°C 194 200 206
f
EL_LR
FEL[7:0] = 1000
0000; V
DD
= 3.7V
T
A
= -40°C to +85°F 186 200 212
T
A
= +25°C 388 400 412
EL Lamp Switching Frequency
f
EL_HR
FEL[7:0] = 1011
1111; V
DD
= 3.7V
T
A
= -40°C to +85°F 376 400 424
Hz
BOOST CONVERTER
EL_ _[4:0] = 01000; V
DD
= 3.7V 33 39 45
EL_ _[4:0] = 10000; V
DD
= 3.7V 68 77 86
Peak Output Voltage V
cs
EL_ _[4:0] = 11111; V
DD
= 3.7V 134 150 160
V
FSW[4:0] = 10000 400
FSW[4:0] = 11111 800
FSW[4:0] = 00000 (default) 800
Tapped-Inductor Center
Switching Frequency
f
SW
FSW[4:0] = 01111 1600
kHz
Tapped-Inductor Switching
Frequency Spreading Factor
S
F
SS[1:0] = 01, 10, or 11 8 %
Tapped-Inductor Switching
Frequency Modulation Frequency
f
M
SS[1:0] = 11 f
SW
/128 kHz
Switch On-Resistance R
LX
I
SINK
= 25mA, V
DD
= 3.7V 3 Ω
LX Current I
LX
V
LX
= 30V -1 +10 µA
CS Input Current I
CS
No load, V
CS
= 150V 27 µA
CONTROL INPUT AUX
Input Range AUX
RNG
0V
DD
V
Input Capacitance AUX
CAP
10 pF
CONTROL INPUT RB
Input Logic-Low Voltage V
IL_RB
0.5 V
Input Logic-High Voltage V
IH_RB
1.5 V
Input Hysteresis I
HYS_RB
130 mV
Input Leakage Current I
LKG_RB
V
RB
= 5.5V or 0 -1 +1 µA
Input Capacitance C
IN
10 pF
I
2
C INTERFACE LOGIC (SDA, SCL, A1, AND A0) (Figure 1)
Input Logic-Low Voltage V
IL
0.5 V
Input Logic-High Voltage V
IH
1.5 V
Input Hysteresis I
HYS
130 mV
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)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P20

MAX14521EETG+T

Mfr. #:
Buy MAX14521EETG+T
Manufacturer:
Maxim Integrated
Description:
Display Drivers & Controllers Quad High-Voltage EL Lamp Driver w/I2C
Lifecycle:
New from this manufacturer.
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