Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
IN
= 12V, C
REG
= 0.1μF, I
REG
= 0, C
LGC
= 15nF, V
DIM1
= V
DIM2
= V
DIM3
= 3.4V, R
CS_
= 2.85Ω from CS_ to GND, T
J
= T
A
= -40°C
to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Undervoltage Lockout
Ground Current
Guaranteed Output Current
LED Current-Sense Accuracy
Dropout Voltage (Note 2)
Output Current Slew Rate
Short-Circuit Current
LEDGOOD
LEDGOOD Output Logic Low
LGC Pullup Resistor
LGC Input Upper Threshold
LGC Input Lower Threshold
LGC Pulldown Current
LGC Clock Period
DIMMING INPUT (DIM1, DIM2, DIM3)
DIM_ Logic-Input Bias Current
DIM_ Input-Voltage High
DIM_ Input-Voltage Low
DIM_ Frequency
0
I
DIM_
-0.1
2.4
+0.1
V
IN
0.6
3
µA
V
V
kHz
V
UTH
V
LTH
V
LGC
> V
UTH
C
LGC
= 15nF
0.77
V
OL
I
SINK
= 2mA
65
100
2.53
0.8
20
1.5
2.3
0.4
135
V
kΩ
V
V
mA
ms
V
OUT_
= 0V
∆VDO
SYMBOL
V
IN
UVLO
I
G
I
OUT
5mA ≤ I
OUT_
≤ 70mA
I
OUT_
= 70mA, 6.5V ≤V
IN
≤ 40V
I
OUT_
= 70mA, 5.5V ≤ V
IN
≤ 6.5V
0.3
0.3
8
180
V
IN
rising
V
IN
falling
I
OUT1
= I
OUT2
= I
OUT3
= 70mA
100
5
0.7
0.8
CONDITIONS
MIN
5.5
4.4
4.0
4.9
4.6
1.5
TYP
MAX
40
5.4
5.2
3
UNITS
V
V
mA
mA
%
V
mA/µs
mA
www.maximintegrated.com
Maxim Integrated
│
2
MAX16823
High-Voltage, 3-Channel Linear High-Brightness
LED Driver with Open LED Detection
Electrical Characteristics (continued)
(V
IN
= 12V, C
REG
= 0.1μF, I
REG
= 0, C
LGC
= 15nF, V
DIM1
= V
DIM2
= V
DIM3
= 3.4V, R
CS_
= 2.85Ω from CS_ to GND, T
J
= T
A
= -40°C
to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Turn-On Time
Turn-Off Time
Output Current Rise Time
Output Current Fall Time
CURRENT SENSE
Regulated CS_ Voltage
Input Current (CS1, CS2, CS3)
OVERTEMPERATURE PROTECTION (Note 4)
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
3.4V REGULATOR (REG)
Output Voltage
REG Short-Circuit Current
V
REG
3.275
0 ≤ I
REG
≤ 4mA
V
REG
= 0V
3.221
3.41
3.38
13
3.547
3.547
V
mA
155
23
°C
°C
V
CS_
5mA ≤ I
OUT_
≤ 70mA
Current out of CS_
193
203
213
+1.2
mV
µA
SYMBOL
CONDITIONS
DIM_ rising edge to 90% of OUT_ current
DIM_ falling edge to 10% of OUT_ current
10% to 90%
90% to 10%
MIN
TYP
12
8
7
6
MAX
28
18
18
15
UNITS
µs
µs
µs
µs
OUTPUTS (OUT1, OUT2, OUT3) (Note 3)
Note 1:
All devices 100% production tested at T
J
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:
Dropout is measured as follows: Connect a resistor from OUT_ to CS_. Connect R
CS_
= 2.85Ω from CS_ to GND.
Set V
IN
= V
OUT
+ 3V (record V
OUT
as V
OUTA
). Reduce V
IN
until V
OUT
= 0.97 x V
OUTA
(record as V
INB
and V
OUTB
).
VDO = V
INB
- V
OUTB
.
Note 3:
Output current rise and fall times are measured with a 62Ω series resistor from OUT_ to CS_.
Note 4:
Overtemperature protection does not function if the output of the 3.4V reference (REG) is shorted to ground.
Typical Operating Characteristics
(V
IN
= 12V, C
REG
= 0.1μF, I
REG
= 0, V
LGC
= unconnected, connect R
CS_
= 2.85Ω from CS_ to GND. Connect OUT_ to CS_ through a
resistor, T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
OUTPUT CURRENT vs. TEMPERATURE
MAX16823 toc01
MAX16823 toc02
90
OUTPUT CURRENT (mA)
80
70
60
50
40
30
20
10
0
I
LOAD
= 5mA
I
LOAD
= 35mA
I
LOAD
= 70mA
0.209
0.208
0.207
V
CS_
(V)
0.206
0.205
0.204
0.203
0.202
0.201
0.200
0
10
20
30
40
50
OUTPUT CURRENT (mA)
60
90
OUTPUT CURRENT (mA)
80
70
60
50
40
30
20
10
I
OUT
= 5mA
0
5
10
15 20 25 30
INPUT VOLTAGE (V)
35
0
I
OUT
= 70mA
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C )
70
40
www.maximintegrated.com
Maxim Integrated
│
3
MAX16823 toc03
100
0.210
V
CS_
vs. OUTPUT CURRENT
100
OUTPUT CURRENT vs. INPUT VOLTAGE
MAX16823
High-Voltage, 3-Channel Linear High-Brightness
LED Driver with Open LED Detection
Typical Operating Characteristics (continued)
(V
IN
= 12V, C
REG
= 0.1μF, I
REG
= 0, V
LGC
= unconnected, connect R
CS_
= 2.85Ω from CS_ to GND. Connect OUT_ to CS_ through a
resistor, T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
MAX16823 toc04
MAX16823 toc05
0.9
DROPOUT VOLTAGE (mV)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
I
LOAD
= 70mA
1.3
SUPPLY CURRENT (mA)
1.2
1.1
1.0
0.9
0.8
0.7
V
DIM1
= V
DIM2
= V
DIM3
= 0V
I
LOAD
= 0
3.4
3.3
I
LOAD
= 4mA
3.2
3.1
3.0
I
LOAD
= 1mA
V
IN
= 12V
V
IN
= 5.5V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0.6
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
V
REG
(V)
V
IN
= 20V
V
IN
= 40V
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
0.210
0.209
0.208
0.207
0.206
0.205
0.204
0.203
0.202
0.201
0.200
0.199
0.198
0.197
0.196
0.195
V
CS_
vs. I
REG
MAX16823 toc07
MAX16823 toc08
3.45
3.44
3.43
3.42
V
REG
(V)
3.41
3.40
3.39
3.38
3.37
3.36
3.35
I
REG
= 1mA
I
REG
= 0
V
REG
vs. V
IN
330Hz DIMMED OPERATION
MAX16823 toc09
I
LOAD
= 70mA
V
IN
= 12V, DIM
PULSED AT 33Hz V
DIM
(1% DUTY CYCLE)
2V/div
0V
I
LED
50mA/div
V
CS_
(V)
I
LOAD
= 70mA
I
REG
= 4mA
0
1
2
3
4 5 6
I
REG
(mA)
7
8
9
10
0
5
10
15
20 25
V
IN
(V)
30
35
40
20µs/div
200Hz DIMMED OPERATION (EXPANDED)
MAX16823 toc10
200Hz DIMMED OPERATION (EXPANDED)
MAX16823 toc11
LEDGOOD RESPONSE TIMES
MAX16823 toc12
V
DIM
2V/div
0V
I
LOAD
50mA/div
I
LOAD
= 70mA
V
IN
= 12V, DIM
PULSED AT 200Hz
(50% DUTY CYCLE)
V
IN
= 12V
C
LGC
= 15nF
V
DIM
2V/div
0V
I
LOAD
50mA/div
0A
I
LOAD
= 70mA
0A
V
IN
= 12V, DIM
PULSED AT 200Hz
(50% DUTY CYCLE)
10µs/div
10µs/div
2ms/div
www.maximintegrated.com
Maxim Integrated
│
4
MAX16823 toc06
1.0
DROPOUT VOLTAGE vs. TEMPERATURE
1.4
SUPPLY CURRENT vs. TEMPERATURE
3.5
V
REG
vs. TEMPERATURE
0A
V
DIM
5V/div
0V
V
LEDGOOD
5V/div
0V
V
LGC
5V/div
0V
MAX16823
Pin Configurations
GND
REG
CS2
CS3
High-Voltage, 3-Channel Linear High-Brightness
LED Driver with Open LED Detection
TOP VIEW
12
CS1 13
OUT3 14
OUT2 15
OUT1 16
11
10
9
8
7
6
LGC
IN
IN
IN
TOP VIEW
OUT2 1
OUT1 2
DIM1 3
DIM2 4
DIM3 5
LEDGOOD 6
IN 7
IN 8
+
16 OUT3
15 CS1
MAX16823
14 CS2
13 CS3
12 GND
11 REG
10 LGC
MAX16823
*EP
+
1
DIM1
2
DIM2
3
DIM3
5
4
*EP
9 IN
LEDGOOD
*EP = EXPOSED PAD.
TSSOP
TQFN
Pin Description
PIN
TQFN
1
2
3
4
5, 6, 7
8
9
10
11
12
13
14
15
16
—
TSSOP
3
4
5
6
7, 8, 9
10
11
12
13
14
15
16
1
2
—
NAME
DIM1
DIM2
DIM3
LEDGOOD
IN
LGC
REG
GND
CS3
CS2
CS1
OUT3
OUT2
OUT1
EP
FUNCTION
Dimming Input 1. DIM1 is a low-frequency dimming input for channel 1. A logic-low turns off
OUT1 and a logic-high turns on OUT1.
Dimming Input 2. DIM2 is a low-frequency dimming input for channel 2. A logic-low turns off
OUT2 and a logic-high turns on OUT2.
Dimming Input 3. DIM3 is a low-frequency dimming input for channel 3. A logic-low turns off
OUT3 and a logic-high turns on OUT3.
Open LED Output. LEDGOOD is an open-drain output. A logic-high indicates the LED
connection is good in all three channels. A logic-low indicates an open LED connection. See
the
LEDGOOD
section.
Positive Input Supply. Bypass with a 0.1µF (min) capacitor to GND. Connect all IN
pins together.
LED Detection-Timing Setting. Connect a capacitor from LGC to ground to set the delay
time for LEDGOOD.
3.4V Voltage Regulator. Connect a 0.1µF capacitor from REG to GND.
Ground
Channel 3 Sense Amplifier Positive Input. Connect the current-sense resistor between CS3
and GND to program the output current level for channel 3.
Channel 2 Sense Amplifier Positive Input. Connect the current-sense resistor between CS2
and GND to program the output current level for channel 2.
Channel 1 Sense Amplifier Positive Input. Connect the current-sense resistor between CS1
and GND to program the output current level for channel 1.
Current Regulator Output 3
Current Regulator Output 2
Current Regulator Output 1
Exposed Pad. Connect EP to a large-area ground plane for effective power dissipation. Do
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