MAX14521E Datasheet, PDF (1/20 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

19-4477; Rev 0; 2/09
EVAALVUAAILTAIOBNLEKIT
Quad, High-Voltage EL Lamp Driver
with I²C Interface
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 I²C 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 I²C 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
Pin Configuration appears on last page
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
♦ I²C 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
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.
Typical Operating Circuit
VBAT
10μF
CSN
330pF
LX
D
RSN
CCS
20Ω
TO BASEBAND/PMIC
3
CS
6
PGND
5
LX
10
SDA
11
SCL
7
A0
8
A1
12
RB
VDD
9
VDD
MAX14521E
GND
15
0.1μF
EL LAMP1
1
EL1
EL LAMP1
23
EL2
EL LAMP1
19
EL3
EL LAMP1
17
EL4
21
COM
13
AUX
AUDIO
LINE-IN
________________________________________________________________ Maxim Integrated Products 1
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.