MAX16803 19-0532 Rev 1 4/09 High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator General Description Features +6.5V to +40V Operating Range The MAX16803 current regulator operates from a 6.5V to 40V input-voltage range and delivers up to a total of Adjustable LED Current (35mA to 350mA) 350mA to one or more strings of high-brightness LEDs 3.5% LED Current Accuracy (HB LEDs). The output current of the MAX16803 is High-Voltage DIM Pin for Dimming Interface adjusted by using an external current-sense resistor in Integrated Pass Element with Low-Dropout series with the LEDs. A dimming input allows wide- Voltage (0.5V typ) range pulsed PWM operation. Wave-shaping circuitry +5V Regulated Output with 4mA Source reduces EMI. The differential current-sense input Capability increases noise immunity. The MAX16803 is well suited for applications requiring high-voltage input and is able Parallel Operation for LED Current > 350mA to withstand automotive load-dump events up to 40V. Differential LED Current Sense An on-board pass element minimizes external compo- Low Shutdown Supply Current (12A typ) nents while providing 3.5% output-current accuracy. Low 204mV Current-Sense Reference Reduces Additional features include a 5V regulated output and Power Losses short-circuit and thermal protection. Wave-Shaped Edges Reduce Radiated EMI During The MAX16803 is available in a thermally enhanced, PWM Dimming 5mm x 5mm, 16-pin TQFN package and is specified Thermal Shutdown over the automotive -40C to +125C temperature range. Output Short-Circuit Protection Available in Small, Thermally Enhanced, Applications 5mm x 5mm, 16-Pin TQFN Package Automotive Interior: Map, Courtesy, and Cluster -40C to +125C Operating Temperature Range Lighting Ordering Information Automotive Exterior: Rear Combination Lights (RCLs) PART TEMP RANGE PIN-PACKAGE Emergency Vehicle Warning Lights MAX16803ATE+ -40C to +125C 16 TQFN-EP* Navigation and Marine Indicators MAX16803ATE/V+ -40C to +125C 16 TQFN-EP* General Lighting +Denotes a lead(Pb)-free/RoHS-compliant package. Signage, Gasoline Canopies, Beacons *EP = Exposed pad. /V denotes an automotive qualified part. Pin Configuration Simplified Diagram TOP VIEW +6.5V TO +40V 12 11 10 9 IN OUT 0.1F +5V REG 8 N.C. DIM 13 V5 LEDs 0.1F 14 7 N.C. N.C. EN MAX16803 MAX16803 EN 15 6 N.C. CS+ OUT 16 + 5 N.C. RSENSE PWM DIMMING DIM CS- 12 3 4 GND TQFN Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com. EVALUATION KIT AVAILABLE OUT GND IN V5 IN CS- N.C. CS+High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator ABSOLUTE MAXIMUM RATINGS IN, OUT, DIM, and EN to GND...............................-0.3V to +45V Operating Junction Temperature Range...........-40C to +125C CS+, CS-, V5 to GND ...............................................-0.3V to +6V Junction Temperature......................................................+150C OUT Short Circuited to GND Duration Storage Temperature Range .............................-65C to +150C (at V = +16V) ........................................................60 minutes Lead Temperature (soldering, 10s) .................................+300C IN Maximum Current Into Any Pin (except IN and OUT).........20mA Continuous Power Dissipation (T = +70C) A 16-Pin TQFN (derate 33.3mW/ C above +70 C) ......2666.7mW 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 = V = +12V, C = 0.1F to GND, I = 0, V = 0V, V = +4V, connect R = 0.58 between CS+ and CS- (Note 1). IN EN V5 V5 CS- DIM SENSE T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) J A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V (Note 2) 6.5 40.0 V IN Ground Current I I = 350mA 1.4 3 mA G LOAD Shutdown Supply Current I V 0.6V 12 40 A SHDN EN Guaranteed Output Current I R = 0.55 350 mA OUT SENSE Output Current Accuracy 35mA < I < 350mA 3.5 % OUT I = 350mA (current pulsed), OUT 0.5 1.2 12V < V < 40V IN Dropout Voltage (Note 3) VDO V I = 350mA (current pulsed), OUT 0.5 1.5 6.5V < V < 12V IN Current rising, DIM rising to 4V 17 Output Current Slew Rate mA/s Current falling, DIM falling to 0.6V 17 Short-Circuit Current V = 0V, V = 12V 400 600 800 mA OUT IN LOGIC INPUT EN Input Current I 100 nA EN EN Input Voltage High V 2.8 V IH EN Input Voltage Low V 0.6 V IL TurnOn Time t EN rising edge to 90% of OUT 80 s ON CURRENT SENSE (Note 4) Regulated R Voltage V V = V - V 196 203 210 mV SENSE RSNS SENSE CS+ CS- CS- Voltage Range -0.3 +4.1 V Input Current (CS+) V = 220mV +14 A CS+ Input Current (CS-) V = 220mV -84 A CS+ DIM Input Current 1A DIM Input Voltage High V 4V IH DIM Input Voltage Low V 0.6 V IL Turn-On Time t After DIM rising to 4V (Note 5) 52 s ON Turn-Off Time t After DIM falling to 0.6V (Note 5) 38 s OFF 2 MAX16803