Datasheet

5Maxim Integrated
Integrated, 4-Channel, High-Brightness LED
Driver with High-Voltage DC-DC Controller
MAX16814
Typical Operating Characteristics
(V
IN
= V
EN
= 12V, f
SW
= 300kHz, R
SETI
= 15kI, C
VCC
= 1FF, 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
= +25NC, unless otherwise noted.)
SUPPLY CURRENT
vs. SWITCHING FREQUENCY
MAX16814 toc03
f
SW
(kHz)
I
IN
(mA)
1600140012001000800600400
3.2
3.4
3.6
3.8
4.0
4.2
4.4
3.0
200 1800 2000
C
NDRV
= 13pF
V
SETI
vs. PROGRAMMED CURRENT
MAX16814 toc06
LED STRING CURRENT (mA)
V
SETI
(V)
124987246
1.229
1.230
1.231
1.232
1.233
1.234
1.228
20 150
SWITCHING WAVEFORM AT 5kHz
(50% DUTY CYCLE) DIMMING
MAX16814 toc01
I
OUT1
100mA/div
V
OUT
10V/div
0V
0A
0V
V
LX
10V/div
40Fs/div
FIGURE 2
SWITCHING FREQUENCY
vs. TEMPERATURE
MAX16814 toc04
TEMPERATURE (NC)
SWITCHING FREQUENCY (kHz)
1007525 500-25
292
294
296
298
300
302
304
306
308
310
290
-50 125
EN THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX16814 toc07
TEMPERATURE (NC)
EN THRESHOLD VOLTAGE (V)
1007550250-25
1.15
1.20
1.25
1.30
1.10
-50 125
V
EN
RISING
V
EN
FALLING
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX16814 toc02
V
IN
(V)
I
IN
(mA)
40353025201510
2.6
2.8
3.0
3.2
3.4
3.6
3.8
2.4
54
5
C
NDRV
= 13pF
T
A
= +125NC
T
A
= +25NC
T
A
= -40NC
V
SETI
vs. TEMPERATURE
MAX16814 toc05
TEMPERATURE (NC)
V
SETI
(V)
1007550250-25
1.224
1.228
1.232
1.236
1.240
1.220
-50 125
EN LEAKAGE CURRENT
vs. TEMPERATURE
MAX16814 toc08
TEMPERATURE (NC)
EN LEAKAGE CURRENT (nA)
1007550250-25
30
60
90
120
150
0
-50 125
V
EN
= 2.5V