MAX16836 19-4029 Rev 2 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 MAX16836 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 MAX16836 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 (0.55V typ) range pulsed PWM operation. Wave-shaping circuitry reduces EMI. The differential current-sense input +5V Regulated Output with 4mA Source increases noise immunity. The MAX16836 is well suited Capability for applications requiring a high-voltage input and is Parallel Operation for LED Current > 350mA able to withstand automotive load-dump events up to Differential LED Current Sense 40V. An on-board pass element minimizes external Low Shutdown Supply Current (35A typ) components while providing 3.5% output-current accuracy. Additional features include a 5V regulated Low 200mV Current-Sense Reference Reduces output and short-circuit and thermal protection. Power Losses Wave-Shaped Edges Reduce Radiated EMI During The MAX16836 is available in a thermally enhanced, PWM Dimming 5mm x 5mm, 16-pin TQFN package and in an 8-pin SO package with exposed pad. The MAX16836 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 and in 8-Pin SO with Exposed Pad Package Automotive Interior: Map, Courtesy, and Cluster -40C to +125C Operating Temperature Range Lighting Ordering Information Automotive Exterior: Tail Lights and CHMSL PART TEMP RANGE PIN-PACKAGE Emergency Vehicle Warning Lights MAX16836ATE+ -40C to +125C 16 TQFN-EP* Navigation and Marine Indicators MAX16836ASA+ -40C to +125C 8 SO-EP* General Lighting +Denotes a lead(Pb)-free/RoHS-compliant package. Signage, Gasoline Canopies, Beacons *EP = Exposed pad. Simplified Diagram Typical Operating Circuit V DIM +6.5V TO +40V IN OUT 0.1F +5V REG 16 15 14 13 V5 LEDs OUT EN N.C. DIM 0.1F 12 1 OUT GND EN MAX16836 D1 V IN CS+ 2 11 IN V5 C2 C1 MAX16836 R R SENSE SENSE 3 IN CS- 10 PWM DIMMING DIM CS- 4 N.C. CS+ 9 GND N.C. N.C. N.C. N.C. 56 7 8 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 AVAILABLEHigh-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator ABSOLUTE MAXIMUM RATINGS IN to GND...............................................................-0.3V to +45V Junction-to-Case Thermal Resistance ( )(Note 1) JC OUT, DIM, and EN to GND..........................-0.3V to (V + 0.3V) 8-Pin SO ...........................................................................7C/W IN CS+, CS-, V5 to GND ...............................................-0.3V to +6V 16-Pin TQFN.....................................................................2C/W OUT Short Circuited to GND Duration Junction-to-Ambient Thermal Resistance ( )(Note 1) JA (at V = +16V) .........................................................60 minutes 8-Pin SO .........................................................................43C/W IN Maximum Current into Any Pin (except IN and OUT).........20mA 16-Pin TQFN...................................................................30C/W Continuous Power Dissipation (T = +70C) Operating Junction Temperature Range...........-40C to +125C A 16-Pin TQFN 5mm x 5mm Junction Temperature......................................................+150C (derate 33.3mW/C above +70C)............................2666.7mW Storage Temperature Range .............................-65C to +150C 8-Pin SO (derate 23.3mW/C above +70C).............1860.5mW Lead Temperature (soldering, 10s) .................................+300C 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 = V = +12V, C = 0.1F to GND, I = 0, V = 0V, V = +4V, connect R = 0.58 between CS+ and CS-. IN EN V5 V5 CS- DIM SENSE T = -40C to +125C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V (Note 3) 6.5 40.0 V IN Ground Current I I = 350mA 1.28 3 mA G LOAD Shutdown Supply Current I V 0.6V 35 70 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 0.55 1.2 12V < V < 40V IN Dropout Voltage (Note 4) VDO V I = 350mA (current pulsed), OUT 0.55 1.5 6.5V < V < 12V IN Current rising, V rising to 4V 7.8 DIM Output Current Slew Rate mA/s Current falling, V falling to 0.6V 7.8 DIM Short-Circuit Current V = 12V, V = 0V 400 500 650 mA IN CS+ LOGIC INPUT EN Input Current I -2.5 -1.0 -0.2 A EN EN Input Voltage High V 2.8 V IH EN Input Voltage Low V 0.6 V IL Turn-On Time t V rising edge to 90% of OUT 110 350 s ON EN CURRENT SENSE Regulated R Voltage V V = V - V 193 200 207 mV SENSE SENSE SENSE CS+ CS- CS- Voltage Range -0.3 +4.1 V Input Current (CS+) V = 220mV 2.7 7.0 A CS+ Input Current (CS-) V = 220mV -50 17.2 A CS+ DIM Input Current -2.5 -1.0 -0.2 A DIM Input Voltage High V 4V IH DIM Input Voltage Low V 0.6 V IL Turn-On Time t After V rising to 4V (Note 5) 110 s ON DIM Turn-Off Time t After V falling to 0.6V (Note 5) 70 s OFF DIM 2 MAX16836