MAX4990E Datasheet, PDF (1/15 Pages) Maxim Integrated Products – High-Voltage, ±15kV ESD-Protected Electroluminescent Lamp Driver

19-0886; Rev 0; 8/07
High-Voltage, ±15kV ESD-Protected
Electroluminescent Lamp Driver
General Description
The MAX4990E high-voltage DC-AC converter is ideal
for driving electroluminescent (EL) lamps. The
MAX4990E features a wide +2.4V to +5.5V input range
that allows the device to accept a wide variety of
voltage sources such as single-cell lithium-ion (Li+)
batteries and higher voltage battery chargers. The lamp
outputs of the device generate up to 250V peak-to-
peak output voltage for maximum lamp brightness.
The MAX4990E utilizes an inductor-based boost con-
verter to generate the high voltage necessary to drive
an EL lamp. The boost-converter switching frequency is
set with the combination of an external capacitor con-
nected from SW to GND and an external resistor con-
nected from SLEW to GND.
The MAX4990E 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 panel. The EL output switching frequency is set
with the combination of an external capacitor connect-
ed from EL to GND and an external resistor connected
from SLEW to GND.
The MAX4990E uses a proprietary acoustic noise-
reduction circuit that controls the slew rate of the AC
voltage, reducing audible noise from the EL panel. The
slew rate is set with an external resistor connected from
SLEW to GND.
The MAX4990E features an EL lamp dimming control
(DIM) that allows the user to set the EL output voltage
with a PWM signal, a DC analog voltage, or a resistor
connected from the DIM input to GND. A capacitor
placed in parallel to the resistor on DIM allows the user
to program a slow turn-on/-off time that generates a soft
fade-on/fade-off effect of the EL lamp.
The MAX4990E enters a low-power shutdown mode
(100nA max) when the EN and DIM inputs are connect-
ed to GND. The MAX4990E also enters thermal shut-
down if the die temperature rises above +158°C.
The MAX4990E 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.
Typical Application Circuits appear at end of data sheet.
Features
♦ ESD-Protected EL Lamp Outputs
±15kV Human Body Model
±4kV IEC 61000-4-2 Contact Discharge
±15kV IEC 61000-4-2 Air-Gap Discharge
♦ 250V_P-P (MAX) Output for Highest Brightness
♦ Wide +2.4V to +5.5V Input Voltage Range
♦ Resistor-Adjustable Slew-Rate Control for
Audible Noise Reduction
♦ Externally Driven Lamp and Switching Converter
Frequencies
♦ Capacitor-Adjustable Lamp and Switching
Converter Frequencies
♦ Low 100nA Shutdown Current
♦ DIM Input for Controlling Output Voltage Through
DC Analog Voltage, PWM, or Resistor to GND
♦ Capacitor Adjustable for Slow Turn-On/-Off
♦ Space-Saving Packages
14-Pin, 3mm x 3mm TDFN
Keypad Backlighting
MP3 Players
LCD Backlighting
Applications
PDAs/Smartphones
Automotive Instrument
Clusters
Pin Configuration
TOP VIEW
14 13 12 11 10 9 8
MAX4990E
*EP
+
1234567
TDFN-EP
*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED.
Ordering Information
PART
MAX4990ETD+
PIN-PACKAGE
14 TDFN-EP (3mm x 3mm)
TOP
MARK
ADL
PKG
CODE
T1433-2
±15kV
PROTECTION
Yes
DIM CONTROL
Yes
SLEW-RATE
CONTROL
Yes
Note: The device operates over the -40°C to +85°C operating
temperature range.
+Denotes a lead-free package.
EP = Exposed paddle.
________________________________________________________________ Maxim Integrated Products 1
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