MAX14521E_15 Datasheet, PDF (8/21 Pages) Maxim Integrated Products – Quad, High-Voltage EL Lamp Driver with I2C Interface

MAX14521E
Quad, High-Voltage EL Lamp Driver
with I²C Interface
Pin Description
PIN
A1
2, 4, 16, 18,
20, 22, 24
3
5
6
NAME
EL1
N.C.
CS
LX
PGND
7
A0
8
A1
9
V_DD
10
SDA
11
SCL
12
RB
13
AUX
14
I.C.
15
GND
17
EL4
19
EL3
21
COM
23
EL2
—
EP
FUNCTION
High-Voltage EL Panel Output 1. Connect EL1 to segment 1 of the EL lamp.
No Connection. Not internally connected.
Feedback Connection. Connect CS to the output of the boost converter (cathode of the rectifying diode)
Internal Switching DMOS Drain Connection. Connect LX to the middle terminal of the tapped inductor.
Power Ground. Connect to GND.
Address Input 0. Address inputs allow up to four connections on one common bus. Connect A0 to GND
or V_DD.
Address Input 1. Address inputs allow up to four connections on one common bus. Connect A1 to
GND or V_DD.
Input Supply Voltage
Open-Drain, Serial Data Input/Output. SDA requires an external pullup resistor.
Serial-Clock Input. SCL requires an external pullup resistor.
Reset Input. Drive RB low to clear all registers to zero and put the device into a low-power shutdown
mode. The device does not respond to I2C communications when RB is held low.
Audio Effects Input. Modulates amplitude/frequency of the EL output with the AUX input voltage
amplitude.
Internally Connected. Connect I.C. to GND.
Ground
High-Voltage EL Panel Output 4. Connect EL4 to segment 4 of the EL lamp.
High-Voltage EL Panel Output 3. Connect EL3 to segment 3 of the EL lamp.
High-Voltage COM Output. Connect COM to common terminal of the EL lamp.
High-Voltage EL Panel Output 2. Connect EL2 to segment 2 of the EL lamp.
Exposed Pad. Connect EP to GND.
Detailed Description
The MAX14521E is a quad-output high-voltage DC-AC
converter that drives four EL lamps. The device features
a 2.7V to 5.5V input range that allows the device to accept
a variety of sources such as single-cell Li+ batteries. The
lamp outputs of the device generate up to 300V_P-P for
maximum lamp brightness.
The MAX14521E utilizes a high-frequency spreadspec-
trum boost converter that reduces the amount of EMI/EFI
generated by the circuit. The boost-converter switching
frequency is set with an 8-bit register through the I²C
interface. The MAX14521E 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 an
EL lamp. An internal register controlled through the I²C
interface sets the shape of the EL output waveshape.
The EL output switching frequency for all outputs is
set with an 8-bit register through the I²C interface. The
MAX14521E provides a serial digital interface that allows
the user to set the peak voltage of each output indepen-
dently with 5 bits of resolution. The MAX14521E also pro-
vides an adjustable automatic ramping feature that slowly
increases or decreases the peak output voltage when the
set value is changed. The slew rate of the 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 frequency for dynamic lighting effects.
The high-voltage outputs are ESD protected up to ±15kV
Human Body Model, ±8kV Air Gap Discharge, and ±6kV
Contact Discharge, as specified in IEC 61000-4-2.
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