19-0532; Rev 0; 5/06
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+
TEMP RANGE
PIN-
PACKAGE
PKG
CODE
T1655-3
-40°C to +125°C 16 TQFN-EP*
+Denotes lead-free package.
*EP
= Exposed pad.
Pin Configuration
GND
CS+
V5
CS-
Simplified Diagram
TOP VIEW
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
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Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
