19-4029; Rev 2; 4/09
KIT
ATION
EVALU
E
BL
AVAILA
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
General Description
The MAX16836 current regulator operates from a 6.5V
to 40V input-voltage range and delivers up to a total of
350mA to one or more strings of high-brightness LEDs
(HB LEDs). The output current of the MAX16836 is
adjusted by using an external current-sense resistor in
series with the LEDs. A dimming input allows wide-
range “pulsed” PWM operation. Wave-shaping circuitry
reduces EMI. The differential current-sense input
increases noise immunity. The MAX16836 is well suited
for applications requiring a high-voltage input and is
able to withstand automotive load-dump events up to
40V. An on-board pass element minimizes external
components while providing ±3.5% output-current
accuracy. Additional features include a 5V regulated
output and short-circuit and thermal protection.
The MAX16836 is available in a thermally enhanced,
5mm x 5mm, 16-pin TQFN package and in an 8-pin SO
package with exposed pad. The MAX16836 is specified
over the automotive -40°C to +125°C temperature range.
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Features
+6.5V to +40V Operating Range
Adjustable LED Current (35mA to 350mA)
±3.5% LED Current Accuracy
High-Voltage DIM Pin for Dimming Interface
Integrated Pass Element with Low-Dropout
Voltage (0.55V typ)
+5V Regulated Output with 4mA Source
Capability
Parallel Operation for LED Current > 350mA
Differential LED Current Sense
Low Shutdown Supply Current (35µA typ)
Low 200mV Current-Sense Reference Reduces
Power Losses
Wave-Shaped Edges Reduce Radiated EMI During
PWM Dimming
Thermal Shutdown
Output Short-Circuit Protection
Available in Small, Thermally Enhanced,
5mm x 5mm, 16-Pin TQFN Package and in 8-Pin
SO with Exposed Pad Package
-40°C to +125°C Operating Temperature Range
MAX16836
Applications
Automotive Interior: Map, Courtesy, and Cluster
Lighting
Automotive Exterior: Tail Lights and CHMSL
Emergency Vehicle Warning Lights
Navigation and Marine Indicators
General Lighting
Signage, Gasoline Canopies, Beacons
Ordering Information
PART
MAX16836ATE+
TEMP RANGE
-40°C to +125°C
PIN-PACKAGE
16 TQFN-EP*
MAX16836ASA+
-40°C to +125°C
8 SO-EP*
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
Typical Operating Circuit
V
DIM
Simplified Diagram
+6.5V TO +40V
IN
0.1µF
OUT
+5V REG
V5
0.1µF
LEDs
16
OUT
1
V
IN
C1
3
4
IN
N.C.
N.C.
5
2
OUT
IN
15
EN
14
N.C.
13
DIM
GND 12
D1
V5 11
EN
MAX16836
CS+
MAX16836
C2
CS- 10
CS+ 9
R
SENSE
PWM DIMMING
DIM
GND
CS-
R
SENSE
N.C.
6
N.C.
7
N.C.
8
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
MAX16836
ABSOLUTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +45V
OUT, DIM, and EN to GND ..........................-0.3V to (V
IN
+ 0.3V)
CS+, CS-, V5 to GND ...............................................-0.3V to +6V
OUT Short Circuited to GND Duration
(at V
IN
= +16V) .........................................................60 minutes
Maximum Current into Any Pin (except IN and OUT) .........±20mA
Continuous Power Dissipation (T
A
= +70°C)
16-Pin TQFN 5mm x 5mm
(derate 33.3mW/°C above +70°C) ............................2666.7mW
8-Pin SO (derate 23.3mW/°C above +70°C).............1860.5mW
Junction-to-Case Thermal Resistance (θ
JC
)(Note 1)
8-Pin SO ...........................................................................7°C/W
16-Pin TQFN.....................................................................2°C/W
Junction-to-Ambient Thermal Resistance (θ
JA
)(Note 1)
8-Pin SO .........................................................................43°C/W
16-Pin TQFN...................................................................30°C/W
Operating Junction 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
Note 1:
Package thermal resistances obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, see www.maxim-ic.com/thermal-tutorial.
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
= V
EN
= +12V, C
V5
= 0.1µF to GND, I
V5
= 0, V
CS-
= 0V, V
DIM
= +4V, connect R
SENSE
= 0.58Ω between CS+ and CS-.
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
Supply Voltage Range
Ground Current
Shutdown Supply Current
Guaranteed Output Current
Output Current Accuracy
SYMBOL
V
IN
I
G
I
SHDN
I
OUT
(Note 3)
I
LOAD
= 350mA
V
EN
≤
0.6V
R
SENSE
= 0.55Ω
35mA < I
OUT
< 350mA
I
OUT
= 350mA (current pulsed),
12V < V
IN
< 40V
I
OUT
= 350mA (current pulsed),
6.5V < V
IN
< 12V
Current rising, V
DIM
rising to 4V
Current falling, V
DIM
falling to 0.6V
V
IN
= 12V, V
CS+
= 0V
I
EN
V
IH
V
IL
t
ON
V
SENSE
V
EN
rising edge to 90% of OUT
V
SENSE
= V
CS+
- V
CS-
V
CS+
= 220mV
V
CS+
= 220mV
V
IH
V
IL
t
ON
t
OFF
After V
DIM
rising to 4V (Note 5)
After V
DIM
falling to 0.6V (Note 5)
-50
-2.5
4
0.6
110
70
193
-0.3
2.7
17.2
-1.0
-0.2
110
200
400
-2.5
2.8
0.6
350
207
+4.1
7.0
350
±3.5
0.55
0.55
7.8
7.8
500
-1.0
650
-0.2
1.2
V
1.5
mA/µs
mA
µA
V
V
µs
mV
V
µA
µA
µA
V
V
µs
µs
CONDITIONS
MIN
6.5
1.28
35
TYP
MAX
40.0
3
70
UNITS
V
mA
µA
mA
%
Dropout Voltage (Note 4)
∆VDO
Output Current Slew Rate
Short-Circuit Current
LOGIC INPUT
EN Input Current
EN Input Voltage High
EN Input Voltage Low
Turn-On Time
CURRENT SENSE
Regulated R
SENSE
Voltage
CS- Voltage Range
Input Current (CS+)
Input Current (CS-)
DIM Input Current
DIM Input Voltage High
DIM Input Voltage Low
Turn-On Time
Turn-Off Time
2
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= V
EN
= +12V, C
V5
= 0.1µF to GND, I
V5
= 0, V
CS-
= 0V, V
DIM
= +4V, connect R
SENSE
= 0.58Ω between CS+ and CS-.
T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 2)
PARAMETER
THERMAL OVERLOAD
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
+5V REGULATOR
Output Voltage Regulation
V5 Short-Circuit Current
V
V5
(Note 6)
V
V5
= 0V (Note 7)
4.85
5.00
15
5.20
V
mA
+159
24
°C
°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX16836
Note 2:
All devices are 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by
design.
Note 3:
Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 4:
Dropout is measured as follows:
Connect R
O
= 27Ω from OUT to CS+. Connect R
SENSE
= 0.58Ω from CS+ to CS-. Set V
IN
= +12V (record V
OUT
as V
OUT1
).
Reduce V
IN
until V
OUT
= 0.97 x V
OUT1
(record as V
IN2
and V
OUT2
).
∆V
DO
= V
IN2
- V
OUT2
.
Note 5:
t
ON
time includes the delay and the rise time needed for I
OUT
to reach 90% of its final value. t
OFF
time is the time needed
for I
OUT
to drop below 10%. See the
Typical Operating Characteristics.
t
ON
and t
OFF
are tested with 13Ω from OUT to CS+.
Note 6:
Current regulation varies with V5 load (see the
Typical Operating Characteristics).
Note 7:
Thermal shutdown does not function if the output of the 5V reference is shorted to ground.
Typical Operating Characteristics
(V
IN
= V
EN
= +12V, T
A
= +25°C, unless otherwise noted.)
OUTPUT CURRENT
vs. TEMPERATURE
MAX16836 toc01
(V
CS+
- V
CS-
)
vs. OUTPUT CURRENT
MAX16836 toc02
OUTPUT CURRENT
vs. INPUT VOLTAGE
350
OUTPUT CURRENT (mA)
300
250
200
150
100
50
MAX16836 toc03
450
400
OUTPUT CURRENT (mA)
350
300
250
200
150
100
50
0
I
LOAD
= 35mA
I
LOAD
= 100mA
I
LOAD
= 200mA
I
LOAD
= 350mA
0.208
400
0.206
(V
CS+
- V
CS-
) (V)
0.204
0.202
0.200
0.198
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
20 50 80 110 140 170 200 230 260 290 320 350
OUTPUT CURRENT (mA)
0
0
5
10
15
20
25
30
35
40
INPUT VOLTAGE (V)
_______________________________________________________________________________________
3
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
MAX16836
Typical Operating Characteristics (continued)
(V
IN
= V
EN
= +12V, T
A
= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
vs. TEMPERATURE
MAX16836 toc04
SHUTDOWN CURRENT
vs. TEMPERATURE
90
SHUTDOWN CURRENT (µA)
80
70
60
50
40
30
20
10
0
V
IN
= 12V
V
IN
= 6.5V
4.8
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
V
IN
= 20V
V
IN
= 40V
MAX16836 toc05
+5V REGULATOR OUTPUT
vs. TEMPERATURE
MAX16836 toc06
1.0
0.9
0.8
DROPOUT VOLTAGE (V)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
I
LOAD
= 350mA
100
5.2
+5V REGULATOR OUTPUT (V)
5.1
I
V5
= 1mA
5.0
NO LOAD
4.9
I
V5
= 5mA
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
(V
CS+
- V
CS-
) vs. I
V5
MAX16836 toc07
+5V REGULATOR OUTPUT vs. V
IN
MAX16836 toc08
0.206
5.2
+5V REGULATOR OUTPUT (V)
0.204
(V
CS+
- V
CS-
) (V)
5.1
NO LOAD
5.0
I
V5
= 5mA
0.202
0.200
I
LOAD
= 350mA
0.198
4.9
I
V5
= 5mA
0.196
0
1
2
3
I
V5
(mA)
4
5
6
4.8
5
10
15
20
25
30
35
40
V
IN
(V)
200Hz DIMMED OPERATION
MAX16836 toc09
200Hz DIMMED OPERATION (EXPANDED)
MAX16836 toc10
V
DIM
2V/div
0V
I
LOAD
= 350mA
V
IN
= V
EN
= 12V
DIM PULSED AT
200Hz (5%
DUTY CYCLE)
I
LOAD
= 350mA
V
IN
= V
EN
= 12V
DIM PULSED AT
200Hz (50%
DUTY CYCLE)
V
DIM
2V/div
0V
I
LOAD
200mA/div
0A
I
LOAD
200mA/div
0A
100µs/div
20µs/div
4
_______________________________________________________________________________________
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
Typical Operating Characteristics (continued)
(V
IN
= V
EN
= +12V, T
A
= +25°C, unless otherwise noted.)
MAX16836
200Hz DIMMED OPERATION (EXPANDED)
MAX16836 toc11
V
SENSE
vs. V
CS-
I
LOAD
= 350mA
V
DIM
2V/div
V
SENSE
(mV)
0V
I
LOAD
200mA/div
0A
204
MAX16836 toc12
I
LOAD
= 350mA
V
IN
= V
EN
= 12V
DIM PULSED AT
200Hz (50%
DUTY CYCLE)
206
202
200
198
20µs/div
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V
CS-
(V)
Pin Description
PIN
TQFN
1, 16
2, 3
4–8, 14
9
10
11
12
13
15
—
SO
8
1
—
2
3
4
5
6
7
—
NAME
OUT
IN
N.C.
CS+
CS-
V5
GND
DIM
EN
EP
FUNCTION
Current-Regulated Output. Connect pin 1 to pin 16.
Positive Input Supply. Bypass IN with a 0.1µF (min) capacitor to GND. Connect pin 2 to pin
No Connection. Not internally connected.
Positive Input of the Internal Differential Amplifier. Connect the current-sense resistor
between CS+ and CS- to program the output current level.
Negative Input of the Internal Differential Amplifier. Connect the current-sense resistor
between CS- and CS+ to program the output current level.
+5V Regulated Output. Connect a 0.1µF capacitor from V5 to GND.
Ground
Pulsed Dimming Input. Drive DIM low to disable the output. Drive DIM high or leave
unconnected to enable the output.
Enable Input. Drive EN high to enable the output.
Exposed Pad. Connect to the ground plane for effective power dissipation. Do not use as
the only ground connection.
_______________________________________________________________________________________
5
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