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MAX16814
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
Typical Operating Characteristics
(V IN = V EN = 12V, f SW = 300kHz, R SETI = 15k I , C VCC = 1 F F, V CC = V DRV , NDRV = COMP = OUT_ = unconnected, V OVP = V CS =
V LEDGND = V DIM = V PGND = V SGND = 0V, load = 4 strings of 7 white LEDs, T A = +25 N C, unless otherwise noted.)
SWITCHING WAVEFORM AT 5kHz
(50% DUTY CYCLE) DIMMING
MAX16814 toc01
3.8
SUPPLY CURRENT vs. SUPPLY VOLTAGE
FIGURE 2
V LX
10V/div
0V
I OUT1
100mA/div
0A
V OUT
10V/div
0V
3.6
3.4
3.2
3.0
2.8
2.6
2.4
C NDRV = 13pF
T A = +125 N C
T A = +25 N C
T A = -40 N C
40 F s/div
5
10
15
20
25
30
35
40
45
V IN (V)
4.4
4.2
SUPPLY CURRENT
vs. SWITCHING FREQUENCY
C NDRV = 13pF
310
308
306
SWITCHING FREQUENCY
vs. TEMPERATURE
1.240
1.236
V SETI vs. TEMPERATURE
4.0
304
3.8
3.6
3.4
3.2
302
300
298
296
294
292
1.232
1.228
1.224
3.0
200 400 600 800 1000 1200 1400 1600 1800 2000
290
-50
-25
0
25
50
75
100
125
1.220
-50
-25
0
25
50
75
100
125
1.234
f SW (kHz)
V SETI vs. PROGRAMMED CURRENT
1.30
TEMPERATURE ( N C)
EN THRESHOLD VOLTAGE
vs. TEMPERATURE
150
TEMPERATURE ( N C)
EN LEAKAGE CURRENT
vs. TEMPERATURE
1.233
1.25
V EN RISING
120
V EN = 2.5V
1.232
90
1.231
1.20
1.230
1.229
1.15
V EN FALLING
60
30
1.228
20
46
72
98
124
150
1.10
-50
-25
0
25
50
75
100
125
0
-50
-25
0
25
50
75
100
125
LED STRING CURRENT (mA)
Maxim Integrated
TEMPERATURE ( N C)
TEMPERATURE ( N C)
5
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