19-44ꢂꢂ; Rev 0; 2/09
Dual Electroluminescent Lamp Driver
MAX514
General Description
Features
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.
♦ Dual ±±15k ꢀEDꢁ-Proteotꢂ ꢀꢃ ꢃaꢄm ꢅuomuoꢆ
♦ 300k Maxiꢄuꢄ ꢅuomuo frP Hightꢆo BPighontꢆꢆ
-ꢁ-
♦ +2.7k or +1.1k Inmuo krloagt Rangt
♦ RtꢆiꢆorP Aꢂjuꢆoablt EltwꢁRaot CrnoPrl
The lamp outputs of the device generate up to 300V
for maximum lamp brightness.
P-P
♦ RtꢆiꢆorP Aꢂjuꢆoablt ꢃaꢄm anꢂ Ewioehing
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.
CrnvtPotP FPtqutneitꢆ
♦ DIM Inmuo frP CrnoPrlling ꢅuomuo krloagt ThPrugh
DC Analrg krloagt, -WM, rP RtꢆiꢆorP or GND
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 15ꢀV Human
Body Model, 4ꢀV ꢁEC ꢂ1000-4-2 Air ꢃap Discharge,
and 4ꢀV ꢁEC ꢂ1000-4-2 Contact Discharge.
♦ CamaeiorP Aꢂjuꢆoablt Erfo TuPnꢁꢅn/ꢁꢅff
♦ ꢃrw ±10nA Ehuoꢂrwn CuPPtno
♦ ThtPꢄal Ehuoꢂrwn
♦ Emaet Eaving, ±4ꢁ-in, 3ꢄꢄ x 3ꢄꢄ TDFN -ae5agt
The MAX14514 features dimming/enable controls
(DꢁM1, DꢁM2) for each output to allow the user to set
the peaꢀ-to-peaꢀ output voltage with a PWM signal, a
DC analog voltage, or a resistor connected from DꢁM_
to ꢃND. The MAX14514 also provides a slow turn-on/-
off feature that slowly ramps the output voltage applied
to the lamp when enabled or disabled.
Ordering Information
-ART
TꢀM- RANGꢀ
-INꢁ-ACKAGꢀ
MAX14514ETD+
-40°C to +85°C
14 TDFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant pacꢀage.
*EP = Exposed pad.
The MAX14514 enters a low-power shutdown mode
when the EN and DꢁM_ inputs are connected to ꢃND.
The device also features thermal shutdown if the die
temperature exceeds +158°C (typ).
Pin Configuration
The MAX14514 is available in a space-saving, 14-pin,
3mm x 3mm TDFN pacꢀage and is specified over the
extended -40°C to +85°C operating temperature range.
TOP VIEW
14 13 12 11 10
9
8
Applications
Keypad Bacꢀlighting
LCD Bacꢀlighting
PDAs/Smartphones
MAX14514
Automotive ꢁnstrument Clusters
*EP
+
1
2
3
4
5
6
7
TDFNꢁꢀ-
(3ꢄꢄ x 3ꢄꢄ)
*EP = EXPOSED PAD. CONNECT EP TO GND OR LEAVE UNCONNECTED.
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±
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