Datasheet

7Maxim Integrated
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
MAX16838
Typical Operating Characteristics (continued)
(V
IN
= V
EN
= 12V, R
RT
= 12.2kI, R
ISET
= 15kI, C
VCC
= 1FF, V
CC
= V
DRV
= V
CFB,
V
DRAIN
= V
COMP
= V
OUT_
, FLT = unconnected,
V
OV
= V
CS
= V
LEDGND
= V
DIM
= V
PGND
= V
SGND
= 0V, V
GATE
= V
NDRV
, T
A
= +25NC, unless otherwise noted.)
INPUT VOLTAGE (V)
DRV VOLTAGE (V)
40302010
4.980
4.985
4.990
4.995
5.000
5.005
5.010
4.975
05
0
DRV LINE REGULATION
MAX16838 toc09
T
A
= +125°C
T
A
= -40°C
T
A
= +25°C
DRV LOAD REGULATION
MAX16838 toc10
LOAD (mA)
V
DRV
(V)
252015105
4.970
4.975
4.980
4.985
4.990
4.995
5.000
5.005
5.010
4.965
03
0
T
A
= -40°C
T
A
= +25°C
T
A
= +125°C
V
IN
= 12V
FREQUENCY vs. R
RT
R
RT
(kI)
FREQUENCY(MHz)
3632282420161284
0.5
1.0
1.5
2.0
2.5
0
04
0
MAX16838 toc11
V
IN
= 12V
LODIM MODE RESPONSE
MAX16838 toc12
10V/div
V
IN
V
DIM
V
LED_
I
OUT_
5V/div
100mA/div
0V
20V/div
0V
0V
0A
20ms/div
DIM ON-TIME < 5 x f
SW
LED SWITCHING WITH DIM AT 200Hz
(50% DUTY CYCLE)
MAX16838 toc13
10mA/div
I
OUT1
I
OUT2
V
DIM
100mA/div
0V
5V/div
0A
0A
2ms/div
I
LED
vs. R
ISET
R
ISET
(kI)
I
LED
(mA)
25 30 35 40 45 50 55 60 65 70 7515 20
110
100
90
80
70
50
40
30
20
10
60
120
130
140
150
0
10
MAX16838 toc14
V
IN
= 12V