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PDF MAX14514 Data sheet ( Hoja de datos )
| Número de pieza | MAX14514 | |
| Descripción | Dual Electroluminescent Lamp Driver | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-4466; Rev 0; 2/09
www.DataSheet4U.com
EVAALVUAAILTAIOBNLEKIT
Dual Electroluminescent Lamp Driver
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 300VP-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
♦ 300VP-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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX14514ETD+
-40°C to +85°C
14 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
TOP VIEW
Pin Configuration
14 13 12 11 10 9 8
MAX14514
+ *EP
1234567
TDFN-EP
(3mm x 3mm)
*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED.
________________________________________________________________ Maxim Integrated Products 1
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataShe
Dual Electroluminescent Lamp Driver
ELECTRICAL CHARACTERISTICS (continued)
(VDD = +2.7V to +5.5V, CLAMP_TOTAL = 10nF, CCS = 3.3nF, LX = 220µH (ISAT = 170mA, RS = 5.5Ω), TA = -40°C to +85°C, unless
otherwise noted. Typical values are at VDD = +3.0V, TA = +25°C.) (Note 2)
PARAMETER
CONTROL INPUT (EN)
Input Logic-High Voltage
Input Logic-Low Voltage
THERMAL SHUTDOWN
Thermal Shutdown
Thermal Shutdown Hysteresis
SYMBOL
VIH_EN
VIL_EN
CONDITIONS
MIN TYP MAX UNITS
1.4 V
0.3 V
158 °C
8 °C
Note 2: All devices are 100% production tested at TA = +25°C. All temperature limits are guaranteed by design.
(VDD = +3.6V, TA = +25°C, unless otherwise noted.)
TOTAL INPUT CURRENT
vs. SUPPLY VOLTAGE
25
25
20 20
15 15
10 10
55
Typical Operating Characteristics
TOTAL INPUT CURRENT
vs. TEMPERATURE
INPUT CURRENT AND PEAK-TO-PEAK OUTPUT
VOLTAGE vs. BOOST CONVERTER FREQUENCY
80 300MAX14514 toc03
PEAK-TO-PEAK OUTPUT
90% DUTY CYCLE
60 225
40 150
20 75
0
2.7 3.4 4.1 4.8
SUPPLY VOLTAGE (V)
SHUTDOWN CURRENT
vs. SUPPLY VOLTAGE
0.4
DIM1 = DIM2 = EN = 0V
0.35
0.3
0.25
0.2
0.15
0.1
0.05
0
2.7 3.4 4.1 4.8
SUPPLY VOLTAGE (V)
0
5.5 -40 -15 10 35 60 85
TEMPERATURE (°C)
SHUTDOWN CURRENT
vs. TEMPERATURE
100
DIM1 = DIM2 = EN = 0V
10
1
0.1
0.01
0.001
5.5 -40 -15 10 35 60 85
TEMPERATURE (°C)
00
40 80 120 160 200
BOOST CONVERTER FREQUENCY (kHz)
PEAK-TO-PEAK OUTPUT VOLTAGE
vs. SUPPLY VOLTAGE
250
DIM = 1V
200
150 DIM_ = 0.7V
100
DIM = 0.5V
DIM_ = 0.4V
50
0
2.7 3.4 4.1 4.8 5.5
SUPPLY VOLTAGE (V)
_______________________________________________________________________________________ 5
5 Page 
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Dual Electroluminescent Lamp Driver
The MAX14514 boost converter frequency uses an
internal switch oscillator to set the desired frequency of
the boost converter. The boost converter frequency is
adjusted by either 1) the combination of a resistor from
SLEW to GND and an external capacitor from SW to
GND, or 2) by driving a PWM signal directly into the SW
input. When SW is driven with an external PWM signal
at a suggested 90% duty cycle, the boost converter fre-
quency is changed to the frequency of the external
PWM signal. (See the CSW Capacitor Selection section
for choosing the CSW capacitor value.)
Shutdown
The MAX14514 features a shutdown mode to disable
the device and reduce supply current. Entering and
exiting shutdown mode depends on if slow turn-on/turn-
off is enabled or disabled.
When slow turn-on/turn-off is enabled, shut down the
device by driving EN low. Enable the device by driving
EN high.
When slow turn-on/turn-off is disabled, shut down the
device by driving EN low and both DIM1 and DIM2
below VIL_DIM_. Enable the device by driving EN high
and either DIM1 or DIM2 above VLPD_.
Undervoltage Lockout (UVLO)
The MAX14514 has a UVLO threshold of +2.1V (typ).
When VDD falls below this threshold, the device enters
a nonoperative mode.
Thermal Short-Circuit Protection
The MAX14514 enters a nonoperative mode if the
internal die temperature of the device reaches or
exceeds +158°C (typ). The device turns back on when
the internal die temperature cools to +150°C (typ).
±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The EL lamp driver outputs of the MAX14514
(V1, V2, and COM) have extra protection against static
electricity. Maxim’s engineers have developed state-of-
the-art structures to protect these pins against ESD of
±15kV without damage. The ESD structures withstand
high ESD in all states: normal operation, shutdown, and
powered down. After an ESD event, the MAX14514
keeps working without latchup or damage.
ESD protection can be tested in various ways. The
transmitter EL lamp outputs of the MAX14514 are char-
acterized for protection to the following limits:
• ±15kV using the Human Body Model
• ±4kV IEC 61000-4-2 Contact Discharge
• ±4kV IEC 61000-4-2 Air-Gap Discharge
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Human Body Model
Figure 1a shows the Human Body Model, and Figure
1b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does
not specifically refer to integrated circuits. The
MAX14514 assists in designing equipment to meet IEC
61000-4-2 without the need for additional ESD-protec-
tion components.
The major difference between tests done using the
Human Body Model and IEC 61000-4-2 is higher peak
current in IEC 61000-4-2 because series resistance is
lower in the IEC 61000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 61000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 1c shows the IEC 61000-4-2 model, and
Figure 1d shows the current waveform for IEC 61000-4-2
ESD Contact Discharge test.
The air-gap test involves approaching the device with
a charged probe. The contact discharge method con-
nects the probe to the device before the probe is
energized.
______________________________________________________________________________________ 11
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| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet MAX14514.PDF ] | |
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