Datasheet

MAX4990
High-Voltage, ±15kV ESD-Protected
Electroluminescent Lamp Driver
6 _______________________________________________________________________________________
160
120
80
40
0
80 150115 185 220
BOOST CONVERTER FREQUENCY vs. C
SW
MAX4990 toc16
C
SW
(pF)
BOOST CONVERTER FREQUENCY (kHz)
R
SLEW
= 390k
Ω
110
105
100
95
90
2.4 3.63.0 4.2 4.8 5.4
BOOST CONVERTER FREQUENCY
vs. SUPPLY VOLTAGE
MAX4990 toc17
SUPPLY VOLTAGE (V)
BOOST CONVERTER FREQUENCY (kHz)
110
105
100
95
90
-40 -10-15 356085
BOOST CONVERTER FREQUENCY
vs. TEMPERATURE
MAX4990 toc18
TEMPERATURE (
°
C)
BOOST CONVERTER FREQUENCY (kHz)
OUTPUT VOLTAGE SLOPE vs. R
SLEW
MAX4990 toc19
0
5
15
10
30
35
25
20
40
OUTPUT VOLTAGE SLOPE (V/100μs)
300 500 600400
700
800 900 1000
R
SLEW
(k
Ω
)
22
24
28
26
30
32
2.4 3.63.0 4.2 4.8 5.4
OUTPUT VOLTAGE SLOPE
vs. SUPPLY VOLTAGE
MAX4990 toc20
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE SLOPE (V/100μs)
22
24
28
26
30
32
-40 10-15 35 80 85
OUTPUT VOLTAGE SLOPE
vs. TEMPERATURE
MAX4990 toc21
TEMPERATURE (
°
C)
OUTPUT VOLTAGE SLOPE (V/100μs)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
01.20.6 1.8 2.4 3.0 3.6
SLOW TURN-ON/-OFF TIME vs. C
DIM
MAX4990 toc22
C
DIM
(μF)
SLOW TURN ON/OFF TIME (s)
R
DIM
= 390k
Ω
t
ON
t
OFF
25
0
20
15
10
5
2.4 3.63.0
4.2 4.8 5.4
BRIGHTNESS AND TOTAL INPUT CURRENT
vs. SUPPLY VOLTAGE
MAX4990 toc23
SUPPLY VOLTAGE (V)
BRIGHTNESS (cd/m
2
)
30
22
18
14
26
10
TOTAL INPUT CURRENT (mA)
- - - - SUPPLY CURRENT
C
LAMP
= 20nF
TYPICAL V
A
, V
B
, AND
V
A
- V
B
WAVEFORMS
MAX4990 toc24
1ms/div
V
A
- V
B
100V/div
V
A
50V/div
V
B
50V/div
Typical Operating Characteristics (continued)
(V
DD
= +3.6V, C
LAMP
= 10nF, C
CS
= 3.3nF, L
X
= 220µH (I
SAT
= 170mA, R
S
= 5.5Ω), R
SLEW
= 390kΩ, DIM = V
DD
, C
SW
= 100pF,
C
EL
= 1.2nF, T
A
= +25°C, unless otherwise noted.)