MAX16835 High-Voltage, 350mA, Adjustable Linear High-Brightness LED Driver General Description Features +6.5V to +40V Operating Range The MAX16835 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% Output Current Accuracy (HB LEDs). The output current of the MAX16835 is Integrated Pass Element with Low-Dropout adjusted by using an external current-sense resistor in Voltage (0.55V typ) series with the LEDs. An enable input allows wide- Output Short-Circuit Protection range pulsed dimming. Wave-shaping circuitry +5V Regulated Output with 4mA Source reduces EMI. The differential current-sense input Capability increases noise immunity. The MAX16835 is well suited for applications requiring high-voltage input and is able Thermal Shutdown to withstand automotive load-dump events up to 40V. Differential LED Current Sense An on-board pass element minimizes external compo- High-Voltage Enable Pin for Dimming Interface nents while providing 3.5% output current accuracy. Low Shutdown Supply Current (35A typ) Additional features include a 5V regulated output and short-circuit and thermal protection. Low 200mV Current-Sense Reference Reduces Power Losses The MAX16835 is available in a thermally enhanced, Wave-Shaped Edges Reduce Radiated EMI During 5mm x 5mm, 16-pin TQFN package and is specified PWM Dimming over the automotive -40C to +125C temperature range. Available in Small, Thermally Enhanced, Applications 5mm x 5mm, 16-Pin TQFN Package -40C to +125C Operating Temperature Range Automotive Interior: Map, Courtesy, and Cluster Lighting Automotive Exterior: Tail Lights and CHMSL Ordering Information Warning Lights for Emergency Vehicles PART TEMP RANGE PIN-PACKAGE Navigation and Marine Indicators MAX16835ATE+ -40C to +125C 16 TQFN-EP* General Illumination MAX16835ATE/V+ -40C to +125C 16 TQFN-EP* Signage, Gasoline Canopies, Beacons +Denotes a lead(Pb)-free/RoHS-compliant package. *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. N.C. 13 V5 LEDs 0.1F MAX16835 7 N.C. 14 N.C. MAX16835 EN 15 6 N.C. CS+ RSENSE OUT 16 5 N.C. + PWM DIMMING EN CS- 1 2 3 4 GND TQFN For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-4028 Rev 2 10/12 OUT GND IN V5 IN CS- N.C. CS+MAX16835 High-Voltage, 350mA, Adjustable Linear High-Brightness LED Driver ABSOLUTE MAXIMUM RATINGS IN to GND...............................................................-0.3V to +45V Operating Junction Temperature Range...........-40C to +125C OUT, EN to GND..........................................-0.3V to (V + 0.3V) Junction Temperature......................................................+150C IN CS+, CS-, and V5 to GND........................................-0.3V to +6V Storage Temperature Range .............................-65C to +150C OUT Short Circuited to GND Duration Lead Temperature (soldering, 10s) .................................+300C (at V = +16V) ........................................................60 minutes IN Maximum Current into Any Pin (except IN and OUT).........20mA Continuous Power Dissipation (T = +70C) A 16-Pin TQFN 5mm x 5mm (derate 33.3mW/C above +70C)...........................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. PACKAGE THERMAL CHARACTERISTICS (Note 1) Junction-to-Ambient Thermal Resistance ( ) ...............30C/W JA Junction-to-Case Thermal Resistance ( ).........................2C/W JC 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.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (V = V = +12V, C = 0.1F to GND, I = 0, CS- = GND, connect R = 0.58 between CS+ and CS-. T = -40C to V5 IN EN V5 SENSE A +125C, unless otherwise noted. Typical values are at T = +25C.) (Notes 2 and 3) 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 1.28 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 V 12V < V < 40V IN Dropout Voltage (Note 4) VDO I = 350mA (current pulsed), OUT 0.55 1.5 V 6.5V < V < 40V IN Current rising 7.8 Output Current Slew Rate mA/s Current falling 7.8 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- Input Current (CS+) V = 220mV 2.7 7.0 A CS+ Input Current (CS-) V = 220mV -50 -17.2 A CS+ Maxim Integrated 2