MAX16803_09 Datasheet, PDF (1/11 Pages) Maxim Integrated Products – High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator

19-0532; Rev 1; 4/09
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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.
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
TOP VIEW
Pin Configuration
12 11 10 9
DIM 13
N.C. 14
EN 15
MAX16803
OUT 16
+
8 N.C.
7 N.C.
6 N.C.
5 N.C.
1
2
3
4
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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX16803ATE+
MAX16803ATE/V+
-40°C to +125°C
-40°C to +125°C
16 TQFN-EP*
16 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
/V denotes an automotive qualified part.
Simplified Diagram
+6.5V TO +40V
IN
0.1µF
EN
OUT
MAX16803
+5V REG
V5
0.1µF
CS+
PWM DIMMING
DIM
CS-
GND
LEDs
RSENSE
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.