Datasheet

5Maxim Integrated
Integrated, 2-Channel, High-Brightness LED Driver
with High-Voltage Boost and SEPIC Controller
MAX16838
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= 12V, R
RT
= 12.2kI, R
ISET
= 15kI, C
VCC
= 1FF, V
CC
= V
DRV
= V
CFB,
DRAIN, COMP, OUT_, FLT = unconnected, V
OV
= V
CS
= V
LEDGND
= V
DIM
= V
PGND
= V
SGND
= 0V, V
GATE
= V
NDRV
, T
A
= T
J
= -40NC to +125NC, unless otherwise noted. Typical
values are at T
A
= 25NC.) (Note 2)
Note 2:
All devices are 100% tested at T
A
= +125NC. Limits over temperature are guaranteed by design, not production tested.
Note 3: The shutdown current does not include currents in the OV and CFB resistive dividers.
Note 4:
Gain = DV
COMP
/DV
CS
, 0.05V < V
CS
< 0.15V.
Typical Operating Characteristics
(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.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
FLT LOGIC
Output-Voltage Low V
OL
V
IN
= 4.75V and I
SINK
= 5mA 0.4 V
Output Leakage Current V
FILT
= 5.5V -300 +300 nA
OVERVOLTAGE PROTECTION
OV Trip Threshold V
OV
rising 1.19 1.23 1.265 V
OV Hysteresis 70 mV
OV Input Bias Current 0 P V
OV
P 1.3V -100 +100 nA
THERMAL SHUTDOWN
Thermal Shutdown 165
o
C
Thermal Shutdown Hysteresis 15
o
C
I
IN
vs. SUPPLY VOLTAGE
MAX16838 toc02
SUPPLY VOLTAGE (V)
I
IIN
(mA)
363228242016128
2.5
3.0
3.5
4.0
4.5
5.0
2.0
44
0
T
A
= +125°C
T
A
= +25°C
T
A
= -40°C
V
IN
= 12V
SWITCHING WAVEFORM AT 200Hz
(50% DUTY CYCLE)
MAX16838 toc01
10V/divV
LX
I
LED
V
OUT
100mA/div
20V/div
0V
0V
0A
1ms/div