19-0532; Rev 1; 4/09
IT
TION K
VALUA
E
BLE
AVAILA
High-Voltage, 350mA, High-Brightness LED
Driver with PWM Dimming and 5V Regulator
General Description
The MAX16803 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 MAX16803 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 MAX16803 is well suited
for applications requiring high-voltage input and is able
to withstand automotive load-dump events up to 40V.
An on-board pass element minimizes external compo-
nents while providing ±3.5% output-current accuracy.
Additional features include a 5V regulated output and
short-circuit and thermal protection.
The MAX16803 is available in a thermally enhanced,
5mm x 5mm, 16-pin TQFN package and 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 (0.5V typ)
+5V Regulated Output with 4mA Source
Capability
Parallel Operation for LED Current > 350mA
Differential LED Current Sense
Low Shutdown Supply Current (12µA typ)
Low 204mV 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
-40°C to +125°C Operating Temperature Range
MAX16803
Applications
Automotive Interior: Map, Courtesy, and Cluster
Lighting
Automotive Exterior: Rear Combination Lights (RCLs)
Emergency Vehicle Warning Lights
Navigation and Marine Indicators
General Lighting
Signage, Gasoline Canopies, Beacons
Ordering Information
PART
MAX16803ATE+
MAX16803ATE/V+
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
16 TQFN-EP*
16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
/V denotes an automotive qualified part.
Pin Configuration
GND
CS+
CS-
Simplified Diagram
TOP VIEW
V5
12
11
10
9
+6.5V TO +40V
IN
0.1µF
N.C.
N.C.
N.C.
N.C.
OUT
+5V REG
V5
0.1µF
LEDs
DIM 13
N.C. 14
EN 15
OUT 16
8
7
EN
MAX16803
CS+
MAX16803
+
1
OUT
2
IN
3
IN
4
N.C.
6
5
PWM DIMMING
DIM
GND
CS-
R
SENSE
TQFN
________________________________________________________________
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
MAX16803
ABSOLUTE MAXIMUM RATINGS
IN, OUT, DIM, and EN to GND ...............................-0.3V to +45V
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 (derate 33.3mW/
°
C above +70
°
C) ......2666.7mW
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
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- (Note 1).
T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
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 2)
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, DIM rising to 4V
Current falling, DIM falling to 0.6V
V
OUT
= 0V, V
IN
= 12V
I
EN
V
IH
V
IL
t
ON
V
RSNS
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 DIM rising to 4V (Note 5)
After DIM falling to 0.6V (Note 5)
-84
1
4
0.6
52
38
196
-0.3
80
203
210
+4.1
+14
2.8
0.6
400
350
±3.5
0.5
0.5
17
17
600
800
100
1.2
V
1.5
mA/µs
mA
nA
V
V
µs
mV
V
µA
µA
µA
V
V
µs
µs
CONDITIONS
MIN
6.5
1.4
12
TYP
MAX
40.0
3
40
UNITS
V
mA
µA
mA
%
Dropout Voltage (Note 3)
∆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 (Note 4)
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- (Note 1).
T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
THERMAL OVERLOAD
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
+5V REGULATOR
Output Voltage Regulation
V5 Short-Circuit Current
V5
(Note 6)
V5 = 0V (Note 7)
5.0
5.27
16
5.5
V
mA
+155
23
°C
°C
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX16803
Note 1:
All devices 100% production tested at T
A
= +25°C. Limits over the operating temperature range are guaranteed by design.
Note 2:
Resistors were added from OUT to CS+ to aid with the power dissipation during testing.
Note 3:
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 4:
I
V5
= 0mA.
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 CST.
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
MAX16803 toc01
(V
CS+
- V
CS-
) vs. OUTPUT CURRENT
MAX16803 toc02
OUTPUT CURRENT
vs. INPUT VOLTAGE
350
OUTPUT CURRENT (mA)
300
250
200
150
100
50
0
MAX16803 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
0.210
0.209
0.208
(V
CS+
- V
CS-
) (V)
0.207
0.206
0.205
0.204
0.203
0.202
0.201
0.200
V
IN
= 12V
400
-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
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
MAX16803
Typical Operating Characteristics (continued)
(V
IN
= V
EN
= +12V, T
A
= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE
vs. TEMPERATURE
MAX16803 toc04
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX16803 toc05
+5V REGULATOR OUTPUT
vs. TEMPERATURE
MAX16803 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
35
30
SHUTDOWN CURRENT (µA)
25
20
15
10
5
0
V
IN
= 6.5V
V
IN
= 20V
V
IN
= 12V
V
IN
= 40V
5.5
5V REGULATOR OUTPUT (V)
5.4
I
LOAD
= 1mA
5.3
NO LOAD
5.2
5.1
I
LOAD
= 5mA
5.0
-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)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
(V
CS+
- V
CS-
) vs. I
V5
0.210
0.209
0.208
0.207
(V
CS+
- V
CS-
) (V)
0.206
0.205
0.204
0.203
0.202
0.201
0.200
0.199
0.198
0
1
2
3
4
I
V5
(mA)
5
6
7
8
I
LOAD
= 410mA
MAX16803 toc07
+5V REGULATOR OUTPUT vs. V
IN
NO LOAD
5V REGULATOR OUTPUT (V)
5.25
MAX16803 toc08
200Hz DIMMED OPERATION
MAX16803 toc09
5.30
V
DIM
2V/div
0V
5.20
5.15
LOAD = 5mA
5.10
5
10
15
20
LOAD = 1mA
I
LOAD
= 350mA
V
IN
= V
EN
= 12V
DIM PULSED AT
200Hz (1%
DUTY CYCLE)
I
LOAD
200mA/div
0A
25
30
35
40
20µs/div
V
IN
(V)
200Hz DIMMED OPERATION (EXPANDED)
MAX16803 toc10
200Hz DIMMED OPERATION (EXPANDED)
MAX16803 toc11
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
= 350mA
V
IN
= V
EN
= 12V
DIM PULSED AT
200Hz (50%
DUTY CYCLE)
V
DIM
2V/div
0V
I
LOAD
200mA/div
0A
20µs/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.)
MAX16803
V
SNSE
vs. V
CS-
MAX16803 toc12
I
DIM
vs. V
DIM
MAX16803 toc13
205
300
250
200
204
V
SNSE
(mV)
I
DIM
(µA)
V
IN
= 12V
I
LOAD
= 350mA
2.0
2.5
3.0
3.5
V
CS-
(V)
4.0
4.5
5.0
203
150
100
202
201
50
0
0
2
4
6
8
V
DIM
(V)
10
12
14
16
200
Pin Description
PIN
1, 16
2, 3
4–8, 14
9
10
11
12
13
15
—
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 3.
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 to enable the output.
Must not be left unconnected.
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.
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5
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