Rainbow Electronics MAX14514 - Manual

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 300V
P-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
♦ 300V
P-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
MAX14514
Dual Electroluminescent Lamp Driver
________________________________________________________________ Maxim Integrated Products 1
Pin Configuration
19-4466; Rev 0; 2/09
EVALUATION KIT
AVAILABLE
PART TEMP RANGE PIN-PACKAGE
MAX14514ETD+ -40°C to +85°C 14 TDFN-EP*
Ordering Information
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX14514
TDFN-EP
(3mm x 3mm)
+
TOP VIEW
*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED.
2 4 5
13 11 10
EN V
2
COM
DIM2
EL SW
1
14
SLEW
DIM1
3
12
V
1
CAP
6
9
CS
V
DD
7
8
LX
GND
*EP
For information on other Maxim products, visit Maxim’s website at www.maxim-ic.com.